The patch adds driver for Exynos DSI master (DSIM). It is a platform driver which is registered as exynos_drm_display sub-driver of exynos_drm framework and implements DRM encoder/connector pair. It is also MIPI-DSI host driver and provides DSI bus for panels. It interacts with its panel(s) using drm_panel framework.
Signed-off-by: Andrzej Hajda a.hajda@samsung.com --- v2: - add support for DSI message flags, - add support for new DT properties, - remove brightness DRM property, - corrected PM handlers, - minor fixes/improvements
v3: - panel attach/detach moved to connector detect callback, - improved error handling, - removed exynos_drm_initialize callback, - added video interface handling, - moved dsi clock properties to dsi endpoint --- drivers/gpu/drm/exynos/Kconfig | 9 + drivers/gpu/drm/exynos/Makefile | 1 + drivers/gpu/drm/exynos/exynos_drm_drv.c | 15 + drivers/gpu/drm/exynos/exynos_drm_drv.h | 1 + drivers/gpu/drm/exynos/exynos_drm_dsi.c | 1525 +++++++++++++++++++++++++++++++ 5 files changed, 1551 insertions(+) create mode 100644 drivers/gpu/drm/exynos/exynos_drm_dsi.c
diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig index 56f9581..5bf5bca 100644 --- a/drivers/gpu/drm/exynos/Kconfig +++ b/drivers/gpu/drm/exynos/Kconfig @@ -39,6 +39,15 @@ config DRM_EXYNOS_DPI help This enables support for Exynos parallel output.
+config DRM_EXYNOS_DSI + bool "EXYNOS DRM MIPI-DSI driver support" + depends on DRM_EXYNOS + select DRM_MIPI_DSI + select DRM_PANEL + default n + help + This enables support for Exynos MIPI-DSI device. + config DRM_EXYNOS_DP bool "EXYNOS DRM DP driver support" depends on DRM_EXYNOS && ARCH_EXYNOS diff --git a/drivers/gpu/drm/exynos/Makefile b/drivers/gpu/drm/exynos/Makefile index babcd52..33ae365 100644 --- a/drivers/gpu/drm/exynos/Makefile +++ b/drivers/gpu/drm/exynos/Makefile @@ -12,6 +12,7 @@ exynosdrm-$(CONFIG_DRM_EXYNOS_IOMMU) += exynos_drm_iommu.o exynosdrm-$(CONFIG_DRM_EXYNOS_DMABUF) += exynos_drm_dmabuf.o exynosdrm-$(CONFIG_DRM_EXYNOS_FIMD) += exynos_drm_fimd.o exynosdrm-$(CONFIG_DRM_EXYNOS_DPI) += exynos_drm_dpi.o +exynosdrm-$(CONFIG_DRM_EXYNOS_DSI) += exynos_drm_dsi.o exynosdrm-$(CONFIG_DRM_EXYNOS_DP) += exynos_dp_core.o exynos_dp_reg.o exynosdrm-$(CONFIG_DRM_EXYNOS_HDMI) += exynos_hdmi.o exynos_mixer.o exynosdrm-$(CONFIG_DRM_EXYNOS_VIDI) += exynos_drm_vidi.o diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index 771c87e..2d27ba2 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -450,6 +450,12 @@ static int __init exynos_drm_init(void) goto out_dp; #endif
+#ifdef CONFIG_DRM_EXYNOS_DSI + ret = platform_driver_register(&dsi_driver); + if (ret < 0) + goto out_dsi; +#endif + #ifdef CONFIG_DRM_EXYNOS_FIMD ret = platform_driver_register(&fimd_driver); if (ret < 0) @@ -566,6 +572,11 @@ out_hdmi: out_fimd: #endif
+#ifdef CONFIG_DRM_EXYNOS_DSI + platform_driver_unregister(&dsi_driver); +out_dsi: +#endif + #ifdef CONFIG_DRM_EXYNOS_DP platform_driver_unregister(&dp_driver); out_dp: @@ -613,6 +624,10 @@ static void __exit exynos_drm_exit(void) platform_driver_unregister(&fimd_driver); #endif
+#ifdef CONFIG_DRM_EXYNOS_DSI + platform_driver_unregister(&dsi_driver); +#endif + #ifdef CONFIG_DRM_EXYNOS_DP platform_driver_unregister(&dp_driver); #endif diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h index 2d892f3..4c5cf68 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h @@ -370,6 +370,7 @@ static inline int exynos_dpi_remove(struct device *dev) { return 0; } #endif
extern struct platform_driver dp_driver; +extern struct platform_driver dsi_driver; extern struct platform_driver fimd_driver; extern struct platform_driver hdmi_driver; extern struct platform_driver mixer_driver; diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c new file mode 100644 index 0000000..697228e --- /dev/null +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c @@ -0,0 +1,1525 @@ +/* + * Samsung SoC MIPI DSI Master driver. + * + * Copyright (c) 2014 Samsung Electronics Co., Ltd + * + * Contacts: Tomasz Figa t.figa@samsung.com + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#include <drm/drmP.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_panel.h> + +#include <linux/clk.h> +#include <linux/irq.h> +#include <linux/phy/phy.h> +#include <linux/regulator/consumer.h> + +#include <video/mipi_display.h> +#include <video/videomode.h> + +#include "exynos_drm_drv.h" + +/* returns true iff both arguments logically differs */ +#define NEQV(a, b) (!(a) ^ !(b)) + +#define DSIM_STATUS_REG 0x0 /* Status register */ +#define DSIM_SWRST_REG 0x4 /* Software reset register */ +#define DSIM_CLKCTRL_REG 0x8 /* Clock control register */ +#define DSIM_TIMEOUT_REG 0xc /* Time out register */ +#define DSIM_CONFIG_REG 0x10 /* Configuration register */ +#define DSIM_ESCMODE_REG 0x14 /* Escape mode register */ + +/* Main display image resolution register */ +#define DSIM_MDRESOL_REG 0x18 +#define DSIM_MVPORCH_REG 0x1c /* Main display Vporch register */ +#define DSIM_MHPORCH_REG 0x20 /* Main display Hporch register */ +#define DSIM_MSYNC_REG 0x24 /* Main display sync area register */ + +/* Sub display image resolution register */ +#define DSIM_SDRESOL_REG 0x28 +#define DSIM_INTSRC_REG 0x2c /* Interrupt source register */ +#define DSIM_INTMSK_REG 0x30 /* Interrupt mask register */ +#define DSIM_PKTHDR_REG 0x34 /* Packet Header FIFO register */ +#define DSIM_PAYLOAD_REG 0x38 /* Payload FIFO register */ +#define DSIM_RXFIFO_REG 0x3c /* Read FIFO register */ +#define DSIM_FIFOTHLD_REG 0x40 /* FIFO threshold level register */ +#define DSIM_FIFOCTRL_REG 0x44 /* FIFO status and control register */ + +/* FIFO memory AC characteristic register */ +#define DSIM_PLLCTRL_REG 0x4c /* PLL control register */ +#define DSIM_PLLTMR_REG 0x50 /* PLL timer register */ +#define DSIM_PHYACCHR_REG 0x54 /* D-PHY AC characteristic register */ +#define DSIM_PHYACCHR1_REG 0x58 /* D-PHY AC characteristic register1 */ + +/* DSIM_STATUS */ +#define DSIM_STOP_STATE_DAT(x) (((x) & 0xf) << 0) +#define DSIM_STOP_STATE_CLK (1 << 8) +#define DSIM_TX_READY_HS_CLK (1 << 10) +#define DSIM_PLL_STABLE (1 << 31) + +/* DSIM_SWRST */ +#define DSIM_FUNCRST (1 << 16) +#define DSIM_SWRST (1 << 0) + +/* DSIM_TIMEOUT */ +#define DSIM_LPDR_TIMEOUT(x) ((x) << 0) +#define DSIM_BTA_TIMEOUT(x) ((x) << 16) + +/* DSIM_CLKCTRL */ +#define DSIM_ESC_PRESCALER(x) (((x) & 0xffff) << 0) +#define DSIM_ESC_PRESCALER_MASK (0xffff << 0) +#define DSIM_LANE_ESC_CLK_EN_CLK (1 << 19) +#define DSIM_LANE_ESC_CLK_EN_DATA(x) (((x) & 0xf) << 20) +#define DSIM_LANE_ESC_CLK_EN_DATA_MASK (0xf << 20) +#define DSIM_BYTE_CLKEN (1 << 24) +#define DSIM_BYTE_CLK_SRC(x) (((x) & 0x3) << 25) +#define DSIM_BYTE_CLK_SRC_MASK (0x3 << 25) +#define DSIM_PLL_BYPASS (1 << 27) +#define DSIM_ESC_CLKEN (1 << 28) +#define DSIM_TX_REQUEST_HSCLK (1 << 31) + +/* DSIM_CONFIG */ +#define DSIM_LANE_EN_CLK (1 << 0) +#define DSIM_LANE_EN(x) (((x) & 0xf) << 1) +#define DSIM_NUM_OF_DATA_LANE(x) (((x) & 0x3) << 5) +#define DSIM_SUB_PIX_FORMAT(x) (((x) & 0x7) << 8) +#define DSIM_MAIN_PIX_FORMAT_MASK (0x7 << 12) +#define DSIM_MAIN_PIX_FORMAT_RGB888 (0x7 << 12) +#define DSIM_MAIN_PIX_FORMAT_RGB666 (0x6 << 12) +#define DSIM_MAIN_PIX_FORMAT_RGB666_P (0x5 << 12) +#define DSIM_MAIN_PIX_FORMAT_RGB565 (0x4 << 12) +#define DSIM_SUB_VC (((x) & 0x3) << 16) +#define DSIM_MAIN_VC (((x) & 0x3) << 18) +#define DSIM_HSA_MODE (1 << 20) +#define DSIM_HBP_MODE (1 << 21) +#define DSIM_HFP_MODE (1 << 22) +#define DSIM_HSE_MODE (1 << 23) +#define DSIM_AUTO_MODE (1 << 24) +#define DSIM_VIDEO_MODE (1 << 25) +#define DSIM_BURST_MODE (1 << 26) +#define DSIM_SYNC_INFORM (1 << 27) +#define DSIM_EOT_DISABLE (1 << 28) +#define DSIM_MFLUSH_VS (1 << 29) + +/* DSIM_ESCMODE */ +#define DSIM_TX_TRIGGER_RST (1 << 4) +#define DSIM_TX_LPDT_LP (1 << 6) +#define DSIM_CMD_LPDT_LP (1 << 7) +#define DSIM_FORCE_BTA (1 << 16) +#define DSIM_FORCE_STOP_STATE (1 << 20) +#define DSIM_STOP_STATE_CNT(x) (((x) & 0x7ff) << 21) +#define DSIM_STOP_STATE_CNT_MASK (0x7ff << 21) + +/* DSIM_MDRESOL */ +#define DSIM_MAIN_STAND_BY (1 << 31) +#define DSIM_MAIN_VRESOL(x) (((x) & 0x7ff) << 16) +#define DSIM_MAIN_HRESOL(x) (((x) & 0X7ff) << 0) + +/* DSIM_MVPORCH */ +#define DSIM_CMD_ALLOW(x) ((x) << 28) +#define DSIM_STABLE_VFP(x) ((x) << 16) +#define DSIM_MAIN_VBP(x) ((x) << 0) +#define DSIM_CMD_ALLOW_MASK (0xf << 28) +#define DSIM_STABLE_VFP_MASK (0x7ff << 16) +#define DSIM_MAIN_VBP_MASK (0x7ff << 0) + +/* DSIM_MHPORCH */ +#define DSIM_MAIN_HFP(x) ((x) << 16) +#define DSIM_MAIN_HBP(x) ((x) << 0) +#define DSIM_MAIN_HFP_MASK ((0xffff) << 16) +#define DSIM_MAIN_HBP_MASK ((0xffff) << 0) + +/* DSIM_MSYNC */ +#define DSIM_MAIN_VSA(x) ((x) << 22) +#define DSIM_MAIN_HSA(x) ((x) << 0) +#define DSIM_MAIN_VSA_MASK ((0x3ff) << 22) +#define DSIM_MAIN_HSA_MASK ((0xffff) << 0) + +/* DSIM_SDRESOL */ +#define DSIM_SUB_STANDY(x) ((x) << 31) +#define DSIM_SUB_VRESOL(x) ((x) << 16) +#define DSIM_SUB_HRESOL(x) ((x) << 0) +#define DSIM_SUB_STANDY_MASK ((0x1) << 31) +#define DSIM_SUB_VRESOL_MASK ((0x7ff) << 16) +#define DSIM_SUB_HRESOL_MASK ((0x7ff) << 0) + +/* DSIM_INTSRC */ +#define DSIM_INT_PLL_STABLE (1 << 31) +#define DSIM_INT_SW_RST_RELEASE (1 << 30) +#define DSIM_INT_SFR_FIFO_EMPTY (1 << 29) +#define DSIM_INT_BTA (1 << 25) +#define DSIM_INT_FRAME_DONE (1 << 24) +#define DSIM_INT_RX_TIMEOUT (1 << 21) +#define DSIM_INT_BTA_TIMEOUT (1 << 20) +#define DSIM_INT_RX_DONE (1 << 18) +#define DSIM_INT_RX_TE (1 << 17) +#define DSIM_INT_RX_ACK (1 << 16) +#define DSIM_INT_RX_ECC_ERR (1 << 15) +#define DSIM_INT_RX_CRC_ERR (1 << 14) + +/* DSIM_FIFOCTRL */ +#define DSIM_RX_DATA_FULL (1 << 25) +#define DSIM_RX_DATA_EMPTY (1 << 24) +#define DSIM_SFR_HEADER_FULL (1 << 23) +#define DSIM_SFR_HEADER_EMPTY (1 << 22) +#define DSIM_SFR_PAYLOAD_FULL (1 << 21) +#define DSIM_SFR_PAYLOAD_EMPTY (1 << 20) +#define DSIM_I80_HEADER_FULL (1 << 19) +#define DSIM_I80_HEADER_EMPTY (1 << 18) +#define DSIM_I80_PAYLOAD_FULL (1 << 17) +#define DSIM_I80_PAYLOAD_EMPTY (1 << 16) +#define DSIM_SD_HEADER_FULL (1 << 15) +#define DSIM_SD_HEADER_EMPTY (1 << 14) +#define DSIM_SD_PAYLOAD_FULL (1 << 13) +#define DSIM_SD_PAYLOAD_EMPTY (1 << 12) +#define DSIM_MD_HEADER_FULL (1 << 11) +#define DSIM_MD_HEADER_EMPTY (1 << 10) +#define DSIM_MD_PAYLOAD_FULL (1 << 9) +#define DSIM_MD_PAYLOAD_EMPTY (1 << 8) +#define DSIM_RX_FIFO (1 << 4) +#define DSIM_SFR_FIFO (1 << 3) +#define DSIM_I80_FIFO (1 << 2) +#define DSIM_SD_FIFO (1 << 1) +#define DSIM_MD_FIFO (1 << 0) + +/* DSIM_PHYACCHR */ +#define DSIM_AFC_EN (1 << 14) +#define DSIM_AFC_CTL(x) (((x) & 0x7) << 5) + +/* DSIM_PLLCTRL */ +#define DSIM_FREQ_BAND(x) ((x) << 24) +#define DSIM_PLL_EN (1 << 23) +#define DSIM_PLL_P(x) ((x) << 13) +#define DSIM_PLL_M(x) ((x) << 4) +#define DSIM_PLL_S(x) ((x) << 1) + +#define DSI_MAX_BUS_WIDTH 4 +#define DSI_NUM_VIRTUAL_CHANNELS 4 +#define DSI_TX_FIFO_SIZE 2048 +#define DSI_RX_FIFO_SIZE 256 +#define DSI_XFER_TIMEOUT_MS 100 +#define DSI_RX_FIFO_EMPTY 0x30800002 + +enum exynos_dsi_transfer_type { + EXYNOS_DSI_TX, + EXYNOS_DSI_RX, +}; + +struct exynos_dsi_transfer { + struct list_head list; + struct completion completed; + int result; + u8 data_id; + u8 data[2]; + u16 flags; + + const u8 *tx_payload; + u16 tx_len; + u16 tx_done; + + u8 *rx_payload; + u16 rx_len; + u16 rx_done; +}; + +#define DSIM_STATE_ENABLED BIT(0) +#define DSIM_STATE_INITIALIZED BIT(1) +#define DSIM_STATE_CMD_LPM BIT(2) + +struct exynos_dsi { + struct mipi_dsi_host dsi_host; + struct drm_connector connector; + struct drm_encoder *encoder; + struct device_node *panel_node; + struct drm_panel *panel; + struct device *dev; + + void __iomem *reg_base; + struct phy *phy; + struct clk *pll_clk; + struct clk *bus_clk; + struct regulator_bulk_data supplies[2]; + int irq; + + u32 pll_clk_rate; + u32 burst_clk_rate; + u32 esc_clk_rate; + u32 lanes; + u32 mode_flags; + u32 format; + struct videomode vm; + + int state; + struct drm_property *brightness; + struct completion completed; + + spinlock_t transfer_lock; /* protects transfer_list */ + struct list_head transfer_list; +}; + +#define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host) +#define connector_to_dsi(c) container_of(c, struct exynos_dsi, connector) + +static void exynos_dsi_wait_for_reset(struct exynos_dsi *dsi) +{ + if (wait_for_completion_timeout(&dsi->completed, msecs_to_jiffies(300))) + return; + + dev_err(dsi->dev, "timeout waiting for reset\n"); +} + +static void exynos_dsi_reset(struct exynos_dsi *dsi) +{ + reinit_completion(&dsi->completed); + writel(DSIM_SWRST, dsi->reg_base + DSIM_SWRST_REG); +} + +#ifndef MHZ +#define MHZ (1000*1000) +#endif + +static unsigned long exynos_dsi_pll_find_pms(struct exynos_dsi *dsi, + unsigned long fin, unsigned long fout, u8 *p, u16 *m, u8 *s) +{ + unsigned long best_freq = 0; + u32 min_delta = 0xffffffff; + u8 p_min, p_max; + u8 _p, uninitialized_var(best_p); + u16 _m, uninitialized_var(best_m); + u8 _s, uninitialized_var(best_s); + + p_min = DIV_ROUND_UP(fin, (12 * MHZ)); + p_max = fin / (6 * MHZ); + + for (_p = p_min; _p <= p_max; ++_p) { + for (_s = 0; _s <= 5; ++_s) { + u64 tmp; + u32 delta; + + tmp = (u64)fout * (_p << _s); + do_div(tmp, fin); + _m = tmp; + if (_m < 41 || _m > 125) + continue; + + tmp = (u64)_m * fin; + do_div(tmp, _p); + if (tmp < 500 * MHZ || tmp > 1000 * MHZ) + continue; + + tmp = (u64)_m * fin; + do_div(tmp, _p << _s); + + delta = abs(fout - tmp); + if (delta < min_delta) { + best_p = _p; + best_m = _m; + best_s = _s; + min_delta = delta; + best_freq = tmp; + } + } + } + + if (best_freq) { + *p = best_p; + *m = best_m; + *s = best_s; + } + + return best_freq; +} + +static unsigned long exynos_dsi_set_pll(struct exynos_dsi *dsi, + unsigned long freq) +{ + static const unsigned long freq_bands[] = { + 100 * MHZ, 120 * MHZ, 160 * MHZ, 200 * MHZ, + 270 * MHZ, 320 * MHZ, 390 * MHZ, 450 * MHZ, + 510 * MHZ, 560 * MHZ, 640 * MHZ, 690 * MHZ, + 770 * MHZ, 870 * MHZ, 950 * MHZ, + }; + unsigned long fin, fout; + int timeout, band; + u8 p, s; + u16 m; + u32 reg; + + clk_set_rate(dsi->pll_clk, dsi->pll_clk_rate); + + fin = clk_get_rate(dsi->pll_clk); + if (!fin) { + dev_err(dsi->dev, "failed to get PLL clock frequency\n"); + return 0; + } + + dev_dbg(dsi->dev, "PLL input frequency: %lu\n", fin); + + fout = exynos_dsi_pll_find_pms(dsi, fin, freq, &p, &m, &s); + if (!fout) { + dev_err(dsi->dev, + "failed to find PLL PMS for requested frequency\n"); + return -EFAULT; + } + + for (band = 0; band < ARRAY_SIZE(freq_bands); ++band) + if (fout < freq_bands[band]) + break; + + dev_dbg(dsi->dev, "PLL freq %lu, (p %d, m %d, s %d), band %d\n", fout, + p, m, s, band); + + writel(500, dsi->reg_base + DSIM_PLLTMR_REG); + + reg = DSIM_FREQ_BAND(band) | DSIM_PLL_EN + | DSIM_PLL_P(p) | DSIM_PLL_M(m) | DSIM_PLL_S(s); + writel(reg, dsi->reg_base + DSIM_PLLCTRL_REG); + + timeout = 1000; + do { + if (timeout-- == 0) { + dev_err(dsi->dev, "PLL failed to stabilize\n"); + return -EFAULT; + } + reg = readl(dsi->reg_base + DSIM_STATUS_REG); + } while ((reg & DSIM_PLL_STABLE) == 0); + + return fout; +} + +static int exynos_dsi_enable_clock(struct exynos_dsi *dsi) +{ + unsigned long hs_clk, byte_clk, esc_clk; + unsigned long esc_div; + u32 reg; + + hs_clk = exynos_dsi_set_pll(dsi, dsi->burst_clk_rate); + if (!hs_clk) { + dev_err(dsi->dev, "failed to configure DSI PLL\n"); + return -EFAULT; + } + + byte_clk = hs_clk / 8; + esc_div = DIV_ROUND_UP(byte_clk, dsi->esc_clk_rate); + esc_clk = byte_clk / esc_div; + + if (esc_clk > 20 * MHZ) { + ++esc_div; + esc_clk = byte_clk / esc_div; + } + + dev_dbg(dsi->dev, "hs_clk = %lu, byte_clk = %lu, esc_clk = %lu\n", + hs_clk, byte_clk, esc_clk); + + reg = readl(dsi->reg_base + DSIM_CLKCTRL_REG); + reg &= ~(DSIM_ESC_PRESCALER_MASK | DSIM_LANE_ESC_CLK_EN_CLK + | DSIM_LANE_ESC_CLK_EN_DATA_MASK | DSIM_PLL_BYPASS + | DSIM_BYTE_CLK_SRC_MASK); + reg |= DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN + | DSIM_ESC_PRESCALER(esc_div) + | DSIM_LANE_ESC_CLK_EN_CLK + | DSIM_LANE_ESC_CLK_EN_DATA(BIT(dsi->lanes) - 1) + | DSIM_BYTE_CLK_SRC(0) + | DSIM_TX_REQUEST_HSCLK; + writel(reg, dsi->reg_base + DSIM_CLKCTRL_REG); + + return 0; +} + +static void exynos_dsi_disable_clock(struct exynos_dsi *dsi) +{ + u32 reg; + + reg = readl(dsi->reg_base + DSIM_CLKCTRL_REG); + reg &= ~(DSIM_LANE_ESC_CLK_EN_CLK | DSIM_LANE_ESC_CLK_EN_DATA_MASK + | DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN); + writel(reg, dsi->reg_base + DSIM_CLKCTRL_REG); + + reg = readl(dsi->reg_base + DSIM_PLLCTRL_REG); + reg &= ~DSIM_PLL_EN; + writel(reg, dsi->reg_base + DSIM_PLLCTRL_REG); +} + +static int exynos_dsi_init_link(struct exynos_dsi *dsi) +{ + int timeout; + u32 reg; + u32 lanes_mask; + + /* Initialize FIFO pointers */ + reg = readl(dsi->reg_base + DSIM_FIFOCTRL_REG); + reg &= ~0x1f; + writel(reg, dsi->reg_base + DSIM_FIFOCTRL_REG); + + usleep_range(9000, 11000); + + reg |= 0x1f; + writel(reg, dsi->reg_base + DSIM_FIFOCTRL_REG); + + usleep_range(9000, 11000); + + /* DSI configuration */ + reg = 0; + + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) { + reg |= DSIM_VIDEO_MODE; + + if (!(dsi->mode_flags & MIPI_DSI_MODE_VSYNC_FLUSH)) + reg |= DSIM_MFLUSH_VS; + if (!(dsi->mode_flags & MIPI_DSI_MODE_EOT_PACKET)) + reg |= DSIM_EOT_DISABLE; + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) + reg |= DSIM_SYNC_INFORM; + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) + reg |= DSIM_BURST_MODE; + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_AUTO_VERT) + reg |= DSIM_AUTO_MODE; + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HSE) + reg |= DSIM_HSE_MODE; + if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HFP)) + reg |= DSIM_HFP_MODE; + if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HBP)) + reg |= DSIM_HBP_MODE; + if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HSA)) + reg |= DSIM_HSA_MODE; + } + + switch (dsi->format) { + case MIPI_DSI_FMT_RGB888: + reg |= DSIM_MAIN_PIX_FORMAT_RGB888; + break; + case MIPI_DSI_FMT_RGB666: + reg |= DSIM_MAIN_PIX_FORMAT_RGB666; + break; + case MIPI_DSI_FMT_RGB666_PACKED: + reg |= DSIM_MAIN_PIX_FORMAT_RGB666_P; + break; + case MIPI_DSI_FMT_RGB565: + reg |= DSIM_MAIN_PIX_FORMAT_RGB565; + break; + default: + dev_err(dsi->dev, "invalid pixel format\n"); + return -EINVAL; + } + + reg |= DSIM_NUM_OF_DATA_LANE(dsi->lanes - 1); + + writel(reg, dsi->reg_base + DSIM_CONFIG_REG); + + reg |= DSIM_LANE_EN_CLK; + writel(reg, dsi->reg_base + DSIM_CONFIG_REG); + + lanes_mask = BIT(dsi->lanes) - 1; + reg |= DSIM_LANE_EN(lanes_mask); + writel(reg, dsi->reg_base + DSIM_CONFIG_REG); + + /* Check clock and data lane state are stop state */ + timeout = 100; + do { + if (timeout-- == 0) { + dev_err(dsi->dev, "waiting for bus lanes timed out\n"); + return -EFAULT; + } + + reg = readl(dsi->reg_base + DSIM_STATUS_REG); + if ((reg & DSIM_STOP_STATE_DAT(lanes_mask)) + != DSIM_STOP_STATE_DAT(lanes_mask)) + continue; + } while (!(reg & (DSIM_STOP_STATE_CLK | DSIM_TX_READY_HS_CLK))); + + reg = readl(dsi->reg_base + DSIM_ESCMODE_REG); + reg &= ~DSIM_STOP_STATE_CNT_MASK; + reg |= DSIM_STOP_STATE_CNT(0xf); + writel(reg, dsi->reg_base + DSIM_ESCMODE_REG); + + reg = DSIM_BTA_TIMEOUT(0xff) | DSIM_LPDR_TIMEOUT(0xffff); + writel(reg, dsi->reg_base + DSIM_TIMEOUT_REG); + + return 0; +} + +static void exynos_dsi_set_display_mode(struct exynos_dsi *dsi) +{ + struct videomode *vm = &dsi->vm; + u32 reg; + + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) { + reg = DSIM_CMD_ALLOW(0xf) + | DSIM_STABLE_VFP(vm->vfront_porch) + | DSIM_MAIN_VBP(vm->vback_porch); + writel(reg, dsi->reg_base + DSIM_MVPORCH_REG); + + reg = DSIM_MAIN_HFP(vm->hfront_porch) + | DSIM_MAIN_HBP(vm->hback_porch); + writel(reg, dsi->reg_base + DSIM_MHPORCH_REG); + + reg = DSIM_MAIN_VSA(vm->vsync_len) + | DSIM_MAIN_HSA(vm->hsync_len); + writel(reg, dsi->reg_base + DSIM_MSYNC_REG); + } + + reg = DSIM_MAIN_HRESOL(vm->hactive) | DSIM_MAIN_VRESOL(vm->vactive); + writel(reg, dsi->reg_base + DSIM_MDRESOL_REG); + + dev_dbg(dsi->dev, "LCD size = %dx%d\n", vm->hactive, vm->vactive); +} + +static void exynos_dsi_set_display_enable(struct exynos_dsi *dsi, bool enable) +{ + u32 reg; + + reg = readl(dsi->reg_base + DSIM_MDRESOL_REG); + if (enable) + reg |= DSIM_MAIN_STAND_BY; + else + reg &= ~DSIM_MAIN_STAND_BY; + writel(reg, dsi->reg_base + DSIM_MDRESOL_REG); +} + +static int exynos_dsi_wait_for_hdr_fifo(struct exynos_dsi *dsi) +{ + int timeout = 2000; + + do { + u32 reg = readl(dsi->reg_base + DSIM_FIFOCTRL_REG); + + if (!(reg & DSIM_SFR_HEADER_FULL)) + return 0; + + if (!cond_resched()) + usleep_range(950, 1050); + } while (--timeout); + + return -ETIMEDOUT; +} + +static void exynos_dsi_set_cmd_lpm(struct exynos_dsi *dsi, bool lpm) +{ + u32 v = readl(dsi->reg_base + DSIM_ESCMODE_REG); + + if (lpm) + v |= DSIM_CMD_LPDT_LP; + else + v &= ~DSIM_CMD_LPDT_LP; + + writel(v, dsi->reg_base + DSIM_ESCMODE_REG); +} + +static void exynos_dsi_force_bta(struct exynos_dsi *dsi) +{ + u32 v = readl(dsi->reg_base + DSIM_ESCMODE_REG); + + v |= DSIM_FORCE_BTA; + writel(v, dsi->reg_base + DSIM_ESCMODE_REG); +} + +static void exynos_dsi_send_to_fifo(struct exynos_dsi *dsi, + struct exynos_dsi_transfer *xfer) +{ + struct device *dev = dsi->dev; + const u8 *payload = xfer->tx_payload + xfer->tx_done; + u16 length = xfer->tx_len - xfer->tx_done; + bool first = !xfer->tx_done; + u32 reg; + + dev_dbg(dev, "< xfer %p: tx len %u, done %u, rx len %u, done %u\n", + xfer, xfer->tx_len, xfer->tx_done, xfer->rx_len, xfer->rx_done); + + if (length > DSI_TX_FIFO_SIZE) + length = DSI_TX_FIFO_SIZE; + + xfer->tx_done += length; + + /* Send payload */ + while (length >= 4) { + reg = (payload[3] << 24) | (payload[2] << 16) + | (payload[1] << 8) | payload[0]; + writel(reg, dsi->reg_base + DSIM_PAYLOAD_REG); + payload += 4; + length -= 4; + } + + reg = 0; + switch (length) { + case 3: + reg |= payload[2] << 16; + /* Fall through */ + case 2: + reg |= payload[1] << 8; + /* Fall through */ + case 1: + reg |= payload[0]; + writel(reg, dsi->reg_base + DSIM_PAYLOAD_REG); + break; + case 0: + /* Do nothing */ + break; + } + + /* Send packet header */ + if (!first) + return; + + reg = (xfer->data[1] << 16) | (xfer->data[0] << 8) | xfer->data_id; + if (exynos_dsi_wait_for_hdr_fifo(dsi)) { + dev_err(dev, "waiting for header FIFO timed out\n"); + return; + } + + if (NEQV(xfer->flags & MIPI_DSI_MSG_USE_LPM, + dsi->state & DSIM_STATE_CMD_LPM)) { + exynos_dsi_set_cmd_lpm(dsi, xfer->flags & MIPI_DSI_MSG_USE_LPM); + dsi->state ^= DSIM_STATE_CMD_LPM; + } + + writel(reg, dsi->reg_base + DSIM_PKTHDR_REG); + + if (xfer->flags & MIPI_DSI_MSG_REQ_ACK) + exynos_dsi_force_bta(dsi); +} + +static void exynos_dsi_read_from_fifo(struct exynos_dsi *dsi, + struct exynos_dsi_transfer *xfer) +{ + u8 *payload = xfer->rx_payload + xfer->rx_done; + bool first = !xfer->rx_done; + struct device *dev = dsi->dev; + u16 length; + u32 reg; + + if (first) { + reg = readl(dsi->reg_base + DSIM_RXFIFO_REG); + + switch (reg & 0x3f) { + case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE: + case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE: + if (xfer->rx_len >= 2) { + payload[1] = reg >> 16; + ++xfer->rx_done; + } + /* Fall through */ + case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE: + case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE: + payload[0] = reg >> 8; + ++xfer->rx_done; + xfer->rx_len = xfer->rx_done; + xfer->result = 0; + goto clear_fifo; + case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT: + dev_err(dev, "DSI Error Report: 0x%04x\n", + (reg >> 8) & 0xffff); + xfer->result = 0; + goto clear_fifo; + } + + length = (reg >> 8) & 0xffff; + if (length > xfer->rx_len) { + dev_err(dev, + "response too long (%u > %u bytes), stripping\n", + xfer->rx_len, length); + length = xfer->rx_len; + } else if (length < xfer->rx_len) + xfer->rx_len = length; + } + + length = xfer->rx_len - xfer->rx_done; + xfer->rx_done += length; + + /* Receive payload */ + while (length >= 4) { + reg = readl(dsi->reg_base + DSIM_RXFIFO_REG); + payload[0] = (reg >> 0) & 0xff; + payload[1] = (reg >> 8) & 0xff; + payload[2] = (reg >> 16) & 0xff; + payload[3] = (reg >> 24) & 0xff; + payload += 4; + length -= 4; + } + + if (length) { + reg = readl(dsi->reg_base + DSIM_RXFIFO_REG); + switch (length) { + case 3: + payload[2] = (reg >> 16) & 0xff; + /* Fall through */ + case 2: + payload[1] = (reg >> 8) & 0xff; + /* Fall through */ + case 1: + payload[0] = reg & 0xff; + } + } + + if (xfer->rx_done == xfer->rx_len) + xfer->result = 0; + +clear_fifo: + length = DSI_RX_FIFO_SIZE / 4; + do { + reg = readl(dsi->reg_base + DSIM_RXFIFO_REG); + if (reg == DSI_RX_FIFO_EMPTY) + break; + } while (--length); +} + +static void exynos_dsi_transfer_start(struct exynos_dsi *dsi) +{ + unsigned long flags; + struct exynos_dsi_transfer *xfer; + bool start = false; + +again: + spin_lock_irqsave(&dsi->transfer_lock, flags); + + if (list_empty(&dsi->transfer_list)) { + spin_unlock_irqrestore(&dsi->transfer_lock, flags); + return; + } + + xfer = list_first_entry(&dsi->transfer_list, + struct exynos_dsi_transfer, list); + + spin_unlock_irqrestore(&dsi->transfer_lock, flags); + + if (xfer->tx_len && xfer->tx_done == xfer->tx_len) + /* waiting for RX */ + return; + + exynos_dsi_send_to_fifo(dsi, xfer); + + if (xfer->tx_len || xfer->rx_len) + return; + + xfer->result = 0; + complete(&xfer->completed); + + spin_lock_irqsave(&dsi->transfer_lock, flags); + + list_del_init(&xfer->list); + start = !list_empty(&dsi->transfer_list); + + spin_unlock_irqrestore(&dsi->transfer_lock, flags); + + if (start) + goto again; +} + +static bool exynos_dsi_transfer_finish(struct exynos_dsi *dsi) +{ + struct exynos_dsi_transfer *xfer; + unsigned long flags; + bool start = true; + + spin_lock_irqsave(&dsi->transfer_lock, flags); + + if (list_empty(&dsi->transfer_list)) { + spin_unlock_irqrestore(&dsi->transfer_lock, flags); + return false; + } + + xfer = list_first_entry(&dsi->transfer_list, + struct exynos_dsi_transfer, list); + + spin_unlock_irqrestore(&dsi->transfer_lock, flags); + + dev_dbg(dsi->dev, + "> xfer %p, tx_len %u, tx_done %u, rx_len %u, rx_done %u\n", + xfer, xfer->tx_len, xfer->tx_done, xfer->rx_len, xfer->rx_done); + + if (xfer->tx_done != xfer->tx_len) + return true; + + if (xfer->rx_done != xfer->rx_len) + exynos_dsi_read_from_fifo(dsi, xfer); + + if (xfer->rx_done != xfer->rx_len) + return true; + + spin_lock_irqsave(&dsi->transfer_lock, flags); + + list_del_init(&xfer->list); + start = !list_empty(&dsi->transfer_list); + + spin_unlock_irqrestore(&dsi->transfer_lock, flags); + + if (!xfer->rx_len) + xfer->result = 0; + complete(&xfer->completed); + + return start; +} + +static void exynos_dsi_remove_transfer(struct exynos_dsi *dsi, + struct exynos_dsi_transfer *xfer) +{ + unsigned long flags; + bool start; + + spin_lock_irqsave(&dsi->transfer_lock, flags); + + if (!list_empty(&dsi->transfer_list) && + xfer == list_first_entry(&dsi->transfer_list, + struct exynos_dsi_transfer, list)) { + list_del_init(&xfer->list); + start = !list_empty(&dsi->transfer_list); + spin_unlock_irqrestore(&dsi->transfer_lock, flags); + if (start) + exynos_dsi_transfer_start(dsi); + return; + } + + list_del_init(&xfer->list); + + spin_unlock_irqrestore(&dsi->transfer_lock, flags); +} + +static int exynos_dsi_transfer(struct exynos_dsi *dsi, + struct exynos_dsi_transfer *xfer) +{ + unsigned long flags; + bool stopped; + + xfer->tx_done = 0; + xfer->rx_done = 0; + xfer->result = -ETIMEDOUT; + init_completion(&xfer->completed); + + spin_lock_irqsave(&dsi->transfer_lock, flags); + + stopped = list_empty(&dsi->transfer_list); + list_add_tail(&xfer->list, &dsi->transfer_list); + + spin_unlock_irqrestore(&dsi->transfer_lock, flags); + + if (stopped) + exynos_dsi_transfer_start(dsi); + + wait_for_completion_timeout(&xfer->completed, + msecs_to_jiffies(DSI_XFER_TIMEOUT_MS)); + if (xfer->result == -ETIMEDOUT) { + exynos_dsi_remove_transfer(dsi, xfer); + dev_err(dsi->dev, "xfer timed out: %*ph %*ph\n", 2, xfer->data, + xfer->tx_len, xfer->tx_payload); + return -ETIMEDOUT; + } + + /* Also covers hardware timeout condition */ + return xfer->result; +} + +static irqreturn_t exynos_dsi_irq(int irq, void *dev_id) +{ + struct exynos_dsi *dsi = dev_id; + u32 status; + + status = readl(dsi->reg_base + DSIM_INTSRC_REG); + if (!status) { + static unsigned long int j; + if (printk_timed_ratelimit(&j, 500)) + dev_warn(dsi->dev, "spurious interrupt\n"); + return IRQ_HANDLED; + } + writel(status, dsi->reg_base + DSIM_INTSRC_REG); + + if (status & DSIM_INT_SW_RST_RELEASE) { + u32 mask = ~(DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY); + writel(mask, dsi->reg_base + DSIM_INTMSK_REG); + complete(&dsi->completed); + return IRQ_HANDLED; + } + + if (!(status & (DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY))) + return IRQ_HANDLED; + + if (exynos_dsi_transfer_finish(dsi)) + exynos_dsi_transfer_start(dsi); + + return IRQ_HANDLED; +} + +static int exynos_dsi_init(struct exynos_dsi *dsi) +{ + exynos_dsi_enable_clock(dsi); + exynos_dsi_reset(dsi); + enable_irq(dsi->irq); + exynos_dsi_wait_for_reset(dsi); + exynos_dsi_init_link(dsi); + + return 0; +} + +static int exynos_dsi_host_attach(struct mipi_dsi_host *host, + struct mipi_dsi_device *device) +{ + struct exynos_dsi *dsi = host_to_dsi(host); + + dsi->lanes = device->lanes; + dsi->format = device->format; + dsi->mode_flags = device->mode_flags; + dsi->panel_node = device->dev.of_node; + + if (dsi->connector.dev) + drm_helper_hpd_irq_event(dsi->connector.dev); + + return 0; +} + +static int exynos_dsi_host_detach(struct mipi_dsi_host *host, + struct mipi_dsi_device *device) +{ + struct exynos_dsi *dsi = host_to_dsi(host); + + dsi->panel_node = NULL; + + if (dsi->connector.dev) + drm_helper_hpd_irq_event(dsi->connector.dev); + + return 0; +} + +/* distinguish between short and long DSI packet types */ +static bool exynos_dsi_is_short_dsi_type(u8 type) +{ + return (type & 0x0f) <= 8; +} + +static ssize_t exynos_dsi_host_transfer(struct mipi_dsi_host *host, + struct mipi_dsi_msg *msg) +{ + struct exynos_dsi *dsi = host_to_dsi(host); + struct exynos_dsi_transfer xfer; + int ret; + + if (!(dsi->state & DSIM_STATE_INITIALIZED)) { + ret = exynos_dsi_init(dsi); + if (ret) + return ret; + dsi->state |= DSIM_STATE_INITIALIZED; + } + + if (msg->tx_len == 0) + return -EINVAL; + + xfer.data_id = msg->type | (msg->channel << 6); + + if (exynos_dsi_is_short_dsi_type(msg->type)) { + const char *tx_buf = msg->tx_buf; + + if (msg->tx_len > 2) + return -EINVAL; + xfer.tx_len = 0; + xfer.data[0] = tx_buf[0]; + xfer.data[1] = (msg->tx_len == 2) ? tx_buf[1] : 0; + } else { + xfer.tx_len = msg->tx_len; + xfer.data[0] = msg->tx_len & 0xff; + xfer.data[1] = msg->tx_len >> 8; + xfer.tx_payload = msg->tx_buf; + } + + xfer.rx_len = msg->rx_len; + xfer.rx_payload = msg->rx_buf; + xfer.flags = msg->flags; + + ret = exynos_dsi_transfer(dsi, &xfer); + return (ret < 0) ? ret : xfer.rx_done; +} + +static const struct mipi_dsi_host_ops exynos_dsi_ops = { + .attach = exynos_dsi_host_attach, + .detach = exynos_dsi_host_detach, + .transfer = exynos_dsi_host_transfer, +}; + +static int exynos_dsi_poweron(struct exynos_dsi *dsi) +{ + int ret; + + ret = regulator_bulk_enable(ARRAY_SIZE(dsi->supplies), dsi->supplies); + if (ret < 0) { + dev_err(dsi->dev, "cannot enable regulators %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(dsi->bus_clk); + if (ret < 0) { + dev_err(dsi->dev, "cannot enable bus clock %d\n", ret); + goto err_bus_clk; + } + + ret = clk_prepare_enable(dsi->pll_clk); + if (ret < 0) { + dev_err(dsi->dev, "cannot enable pll clock %d\n", ret); + goto err_pll_clk; + } + + ret = phy_power_on(dsi->phy); + if (ret < 0) { + dev_err(dsi->dev, "cannot enable phy %d\n", ret); + goto err_phy; + } + + return 0; + +err_phy: + clk_disable_unprepare(dsi->pll_clk); +err_pll_clk: + clk_disable_unprepare(dsi->bus_clk); +err_bus_clk: + regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies); + + return ret; +} + +static void exynos_dsi_poweroff(struct exynos_dsi *dsi) +{ + int ret; + + usleep_range(10000, 20000); + + if (dsi->state & DSIM_STATE_INITIALIZED) { + dsi->state &= ~DSIM_STATE_INITIALIZED; + + exynos_dsi_disable_clock(dsi); + + disable_irq(dsi->irq); + } + + dsi->state &= ~DSIM_STATE_CMD_LPM; + + phy_power_off(dsi->phy); + + clk_disable_unprepare(dsi->pll_clk); + clk_disable_unprepare(dsi->bus_clk); + + ret = regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies); + if (ret < 0) + dev_err(dsi->dev, "cannot disable regulators %d\n", ret); +} + +static int exynos_dsi_enable(struct exynos_dsi *dsi) +{ + int ret; + + if (dsi->state & DSIM_STATE_ENABLED) + return 0; + + ret = exynos_dsi_poweron(dsi); + if (ret < 0) + return ret; + + ret = drm_panel_enable(dsi->panel); + if (ret < 0) { + exynos_dsi_poweroff(dsi); + return ret; + } + + exynos_dsi_set_display_mode(dsi); + exynos_dsi_set_display_enable(dsi, true); + + dsi->state |= DSIM_STATE_ENABLED; + + return 0; +} + +static void exynos_dsi_disable(struct exynos_dsi *dsi) +{ + if (!(dsi->state & DSIM_STATE_ENABLED)) + return; + + exynos_dsi_set_display_enable(dsi, false); + drm_panel_disable(dsi->panel); + exynos_dsi_poweroff(dsi); + + dsi->state &= ~DSIM_STATE_ENABLED; +} + +static void exynos_dsi_dpms(struct exynos_drm_display *display, int mode) +{ + struct exynos_dsi *dsi = display->ctx; + + if (dsi->panel) { + switch (mode) { + case DRM_MODE_DPMS_ON: + exynos_dsi_enable(dsi); + break; + case DRM_MODE_DPMS_STANDBY: + case DRM_MODE_DPMS_SUSPEND: + case DRM_MODE_DPMS_OFF: + exynos_dsi_disable(dsi); + break; + default: + break; + } + } +} + +static enum drm_connector_status +exynos_dsi_detect(struct drm_connector *connector, bool force) +{ + struct exynos_dsi *dsi = connector_to_dsi(connector); + + if (!dsi->panel) { + dsi->panel = of_drm_find_panel(dsi->panel_node); + if (dsi->panel) + drm_panel_attach(dsi->panel, &dsi->connector); + } else if (!dsi->panel_node) { + struct exynos_drm_display *display; + + display = platform_get_drvdata(to_platform_device(dsi->dev)); + exynos_dsi_dpms(display, DRM_MODE_DPMS_OFF); + drm_panel_detach(dsi->panel); + dsi->panel = NULL; + } + + if (dsi->panel) + return connector_status_connected; + + return connector_status_disconnected; +} + +static void exynos_dsi_connector_destroy(struct drm_connector *connector) +{ +} + +static struct drm_connector_funcs exynos_dsi_connector_funcs = { + .dpms = drm_helper_connector_dpms, + .detect = exynos_dsi_detect, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = exynos_dsi_connector_destroy, +}; + +static int exynos_dsi_get_modes(struct drm_connector *connector) +{ + struct exynos_dsi *dsi = connector_to_dsi(connector); + + if (dsi->panel) + return dsi->panel->funcs->get_modes(dsi->panel); + + return 0; +} + +static int exynos_dsi_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + return MODE_OK; +} + +static struct drm_encoder * +exynos_dsi_best_encoder(struct drm_connector *connector) +{ + struct exynos_dsi *dsi = connector_to_dsi(connector); + + return dsi->encoder; +} + +static struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs = { + .get_modes = exynos_dsi_get_modes, + .mode_valid = exynos_dsi_mode_valid, + .best_encoder = exynos_dsi_best_encoder, +}; + +static int exynos_dsi_create_connector(struct exynos_drm_display *display, + struct drm_encoder *encoder) +{ + struct exynos_dsi *dsi = display->ctx; + struct drm_connector *connector = &dsi->connector; + int ret; + + dsi->encoder = encoder; + + connector->polled = DRM_CONNECTOR_POLL_HPD; + + ret = drm_connector_init(encoder->dev, connector, + &exynos_dsi_connector_funcs, + DRM_MODE_CONNECTOR_DSI); + if (ret) { + DRM_ERROR("Failed to initialize connector with drm\n"); + return ret; + } + + drm_connector_helper_add(connector, &exynos_dsi_connector_helper_funcs); + drm_sysfs_connector_add(connector); + drm_mode_connector_attach_encoder(connector, encoder); + + return 0; +} + +static void exynos_dsi_mode_set(struct exynos_drm_display *display, + struct drm_display_mode *mode) +{ + struct exynos_dsi *dsi = display->ctx; + struct videomode *vm = &dsi->vm; + + vm->hactive = mode->hdisplay; + vm->vactive = mode->vdisplay; + vm->vfront_porch = mode->vsync_start - mode->vdisplay; + vm->vback_porch = mode->vtotal - mode->vsync_end; + vm->vsync_len = mode->vsync_end - mode->vsync_start; + vm->hfront_porch = mode->hsync_start - mode->hdisplay; + vm->hback_porch = mode->htotal - mode->hsync_end; + vm->hsync_len = mode->hsync_end - mode->hsync_start; +} + +static struct exynos_drm_display_ops exynos_dsi_display_ops = { + .create_connector = exynos_dsi_create_connector, + .mode_set = exynos_dsi_mode_set, + .dpms = exynos_dsi_dpms +}; + +static struct exynos_drm_display exynos_dsi_display = { + .type = EXYNOS_DISPLAY_TYPE_LCD, + .ops = &exynos_dsi_display_ops, +}; + +/* of_* functions will be removed after merge of of_graph patches */ +static struct device_node * +of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg) +{ + struct device_node *np; + + for_each_child_of_node(parent, np) { + u32 r; + + if (!np->name || of_node_cmp(np->name, name)) + continue; + + if (of_property_read_u32(np, "reg", &r) < 0) + r = 0; + + if (reg == r) + break; + } + + return np; +} + +static struct device_node *of_graph_get_port_by_reg(struct device_node *parent, + u32 reg) +{ + struct device_node *ports, *port; + + ports = of_get_child_by_name(parent, "ports"); + if (ports) + parent = ports; + + port = of_get_child_by_name_reg(parent, "port", reg); + + of_node_put(ports); + + return port; +} + +static struct device_node * +of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg) +{ + return of_get_child_by_name_reg(port, "endpoint", reg); +} + +static int exynos_dsi_of_read_u32(const struct device_node *np, + const char *propname, u32 *out_value) +{ + int ret = of_property_read_u32(np, propname, out_value); + + if (ret < 0) + pr_err("%s: failed to get '%s' property\n", np->full_name, + propname); + + return ret; +} + +enum { + DSI_PORT_IN, + DSI_PORT_OUT +}; + +static int exynos_dsi_parse_dt(struct exynos_dsi *dsi) +{ + struct device *dev = dsi->dev; + struct device_node *node = dev->of_node; + struct device_node *port, *ep; + int ret; + + ret = exynos_dsi_of_read_u32(node, "samsung,pll-clock-frequency", + &dsi->pll_clk_rate); + if (ret < 0) + return ret; + + port = of_graph_get_port_by_reg(node, DSI_PORT_OUT); + if (!port) { + dev_err(dev, "no output port specified\n"); + return -EINVAL; + } + + ep = of_graph_get_endpoint_by_reg(port, 0); + of_node_put(port); + if (!ep) { + dev_err(dev, "no endpoint specified in output port\n"); + return -EINVAL; + } + + ret = exynos_dsi_of_read_u32(ep, "samsung,burst-clock-frequency", + &dsi->burst_clk_rate); + if (ret < 0) + goto end; + + ret = exynos_dsi_of_read_u32(ep, "samsung,esc-clock-frequency", + &dsi->esc_clk_rate); + +end: + of_node_put(ep); + + return ret; +} + +static int exynos_dsi_probe(struct platform_device *pdev) +{ + struct resource *res; + struct exynos_dsi *dsi; + int ret; + + dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL); + if (!dsi) { + dev_err(&pdev->dev, "failed to allocate dsi object.\n"); + return -ENOMEM; + } + + init_completion(&dsi->completed); + spin_lock_init(&dsi->transfer_lock); + INIT_LIST_HEAD(&dsi->transfer_list); + + dsi->dsi_host.ops = &exynos_dsi_ops; + dsi->dsi_host.dev = &pdev->dev; + + dsi->dev = &pdev->dev; + + ret = exynos_dsi_parse_dt(dsi); + if (ret) + return ret; + + dsi->supplies[0].supply = "vddcore"; + dsi->supplies[1].supply = "vddio"; + ret = devm_regulator_bulk_get(&pdev->dev, ARRAY_SIZE(dsi->supplies), + dsi->supplies); + if (ret) { + dev_info(&pdev->dev, "failed to get regulators: %d\n", ret); + return -EPROBE_DEFER; + } + + dsi->pll_clk = devm_clk_get(&pdev->dev, "pll_clk"); + if (IS_ERR(dsi->pll_clk)) { + dev_info(&pdev->dev, "failed to get dsi pll input clock\n"); + return -EPROBE_DEFER; + } + + dsi->bus_clk = devm_clk_get(&pdev->dev, "bus_clk"); + if (IS_ERR(dsi->bus_clk)) { + dev_info(&pdev->dev, "failed to get dsi bus clock\n"); + return -EPROBE_DEFER; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dsi->reg_base = devm_ioremap_resource(&pdev->dev, res); + if (!dsi->reg_base) { + dev_err(&pdev->dev, "failed to remap io region\n"); + return -EADDRNOTAVAIL; + } + + dsi->phy = devm_phy_get(&pdev->dev, "dsim"); + if (IS_ERR(dsi->phy)) { + dev_info(&pdev->dev, "failed to get dsim phy\n"); + return -EPROBE_DEFER; + } + + dsi->irq = platform_get_irq(pdev, 0); + if (dsi->irq < 0) { + dev_err(&pdev->dev, "failed to request dsi irq resource\n"); + return dsi->irq; + } + + irq_set_status_flags(dsi->irq, IRQ_NOAUTOEN); + ret = devm_request_threaded_irq(&pdev->dev, dsi->irq, NULL, + exynos_dsi_irq, IRQF_ONESHOT, + dev_name(&pdev->dev), dsi); + if (ret) { + dev_err(&pdev->dev, "failed to request dsi irq\n"); + return ret; + } + + exynos_dsi_display.ctx = dsi; + + platform_set_drvdata(pdev, &exynos_dsi_display); + exynos_drm_display_register(&exynos_dsi_display); + + return mipi_dsi_host_register(&dsi->dsi_host); +} + +static int exynos_dsi_remove(struct platform_device *pdev) +{ + struct exynos_dsi *dsi = exynos_dsi_display.ctx; + + exynos_dsi_dpms(&exynos_dsi_display, DRM_MODE_DPMS_OFF); + + exynos_drm_display_unregister(&exynos_dsi_display); + mipi_dsi_host_unregister(&dsi->dsi_host); + + return 0; +} + +#if CONFIG_PM_SLEEP +static int exynos_dsi_resume(struct device *dev) +{ + struct exynos_dsi *dsi = exynos_dsi_display.ctx; + + if (dsi->state & DSIM_STATE_ENABLED) { + dsi->state &= ~DSIM_STATE_ENABLED; + exynos_dsi_enable(dsi); + } + + return 0; +} + +static int exynos_dsi_suspend(struct device *dev) +{ + struct exynos_dsi *dsi = exynos_dsi_display.ctx; + + if (dsi->state & DSIM_STATE_ENABLED) { + exynos_dsi_disable(dsi); + dsi->state |= DSIM_STATE_ENABLED; + } + + return 0; +} +#endif + +static const struct dev_pm_ops exynos_dsi_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(exynos_dsi_suspend, exynos_dsi_resume) +}; + +static struct of_device_id exynos_dsi_of_match[] = { + { .compatible = "samsung,exynos4210-mipi-dsi" }, + { } +}; + +MODULE_DEVICE_TABLE(of, exynos_dsi_of_match); +struct platform_driver dsi_driver = { + .probe = exynos_dsi_probe, + .remove = exynos_dsi_remove, + .driver = { + .name = "exynos-dsi", + .owner = THIS_MODULE, + .pm = &exynos_dsi_pm_ops, + .of_match_table = exynos_dsi_of_match, + }, +}; + +MODULE_AUTHOR("Tomasz Figa t.figa@samsung.com"); +MODULE_AUTHOR("Andrzej Hajda a.hajda@samsung.com"); +MODULE_DESCRIPTION("Samsung SoC MIPI DSI Master"); +MODULE_LICENSE("GPL v2");