From: Marian Cichy m.cichy@pengutronix.de

This files documents the device tree for the new imx21-lcdc DRM driver.

Signed-off-by: Marian Cichy m.cichy@pengutronix.de Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de --- .../bindings/display/imx/fsl,imx21-lcdc.yaml | 79 +++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx21-lcdc.yaml

diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx21-lcdc.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx21-lcdc.yaml new file mode 100644 index 000000000000..edf71cfac81c --- /dev/null +++ b/Documentation/devicetree/bindings/display/imx/fsl,imx21-lcdc.yaml @@ -0,0 +1,79 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/imx/fsl,imx21-lcdc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: i.MX21 LCD Controller + +maintainers: + - Philipp Zabel p.zabel@pengutronix.de + +properties: + compatible: + oneOf: + - const: fsl,imx21-lcdc + - items: + - enum: + - fsl,imx25-lcdc + - fsl,imx27-lcdc + - const: fsl,imx21-lcdc + + reg: + maxItems: 1 + + clocks: + maxItems: 3 + + clock-names: + items: + - const: ipg + - const: per + - const: ahb + + resets: + maxItems: 1 + + port: + type: object + description: + "Video port for DPI RGB output." + +required: + - compatible + - reg + - interrupts + - clocks + - clock-names + - port + +additionalProperties: false + +examples: + - | + lcdc: lcdc@53fbc000 { + compatible = "fsl,imx25-lcdc", "fsl,imx21-lcdc"; + reg = <0x53fbc000 0x4000>; + interrupts = <39>; + clocks = <&clks 103>, <&clks 66>, <&clks 49>; + clock-names = "ipg", "ahb", "per"; + + port { + parallel_out: endpoint { + remote-endpoint = <&panel_in>; + }; + }; + + }; + + panel: panel { + compatible = "edt,etm0700g0dh6"; + power-supply = <&lcd_supply>; + backlight = <&bl>; + + port { + panel_in: endpoint { + remote-endpoint = <&parallel_out>; + }; + }; + };

From: Marian Cichy m.cichy@pengutronix.de

Add support for the LCD Controller found on i.MX21, i.MX25 and i.MX27

Note there is already a fb driver for this hardware in the tree that is supposed to be superseded by this one.

Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de --- drivers/gpu/drm/imx/Kconfig | 9 + drivers/gpu/drm/imx/Makefile | 2 + drivers/gpu/drm/imx/imx21-lcdc/imx21-lcdc.c | 631 ++++++++++++++++++++ 3 files changed, 642 insertions(+) create mode 100644 drivers/gpu/drm/imx/imx21-lcdc/imx21-lcdc.c

diff --git a/drivers/gpu/drm/imx/Kconfig b/drivers/gpu/drm/imx/Kconfig index bb9738c7c825..62b24ea1bbe0 100644 --- a/drivers/gpu/drm/imx/Kconfig +++ b/drivers/gpu/drm/imx/Kconfig @@ -42,3 +42,12 @@ config DRM_IMX_HDMI Choose this if you want to use HDMI on i.MX6.

source "drivers/gpu/drm/imx/dcss/Kconfig" + +config DRM_IMX21_LCDC + tristate "Freescale i.MX LCDC displays" + depends on DRM && (ARCH_MXC || ARCH_MULTIPLATFORM || COMPILE_TEST) + select DRM_GEM_CMA_HELPER + select DRM_KMS_HELPER + help + This driver is for the Liquid Crystal Display Controller (LCDC) found + on Freescale i.MX21, i.MX25 and i.MX27. diff --git a/drivers/gpu/drm/imx/Makefile b/drivers/gpu/drm/imx/Makefile index b644deffe948..25685230f4f7 100644 --- a/drivers/gpu/drm/imx/Makefile +++ b/drivers/gpu/drm/imx/Makefile @@ -10,3 +10,5 @@ obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o

obj-$(CONFIG_DRM_IMX_HDMI) += dw_hdmi-imx.o obj-$(CONFIG_DRM_IMX_DCSS) += dcss/ + +obj-$(CONFIG_DRM_IMX21_LCDC) += imx21-lcdc/ diff --git a/drivers/gpu/drm/imx/imx21-lcdc/imx21-lcdc.c b/drivers/gpu/drm/imx/imx21-lcdc/imx21-lcdc.c new file mode 100644 index 000000000000..37e75f728293 --- /dev/null +++ b/drivers/gpu/drm/imx/imx21-lcdc/imx21-lcdc.c @@ -0,0 +1,631 @@ +// SPDX-License-Identifier: GPL-2.0-only +// SPDX-FileCopyrightText: 2020 Marian Cichy kernel@pengutronix.de + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_fb_cma_helper.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_fourcc.h> +#include <drm/drm_gem_atomic_helper.h> +#include <drm/drm_gem_cma_helper.h> +#include <drm/drm_gem_framebuffer_helper.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_simple_kms_helper.h> +#include <drm/drm_vblank.h> +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> + +/* LCDC Screen Start Address Register */ +#define IMX21LCDC_LSSAR 0x0000 + +/* LCDC Size Register */ +#define IMX21LCDC_LSR 0x0004 +#define IMX21LCDC_LSR_XMAX GENMASK(25, 20) /* Screen width (in pixels) divided by 16. */ +#define IMX21LCDC_LSR_YMAX GENMASK(9, 0) + +/* LCDC Virtual Page Width Register */ +#define IMX21LCDC_LVPWR 0x0008 + +/* LCDC Cursor Position Register */ +#define IMX21LCDC_LCPR 0x000c +#define IMX21LCDC_LCPR_CC GENMASK(31, 30) /* Cursor Control */ + +/* LCDC Cursor Width Height and Blink Register*/ +#define IMX21LCDC_LCWHB 0x0010 + +/* LCDC Color Cursor Mapping Register */ +#define IMX21LCDC_LCCMR 0x0014 + +/* LCDC Panel Configuration Register */ +#define IMX21LCDC_LPCR 0x0018 +#define IMX21LCDC_LPCR_PCD GENMASK(5, 0) +#define IMX21LCDC_LPCR_SHARP BIT(6) +#define IMX21LCDC_LPCR_SCLKSEL BIT(7) +#define IMX21LCDC_LPCR_ACD GENMASK(14, 8) +#define IMX21LCDC_LPCR_ACDSEL BIT(15) +#define IMX21LCDC_LPCR_REV_VS BIT(16) +#define IMX21LCDC_LPCR_SWAP_SEL BIT(17) +#define IMX21LCDC_LPCR_END_SEL BIT(18) +#define IMX21LCDC_LPCR_SCLKIDLE BIT(19) +#define IMX21LCDC_LPCR_OEPOL BIT(20) +#define IMX21LCDC_LPCR_CLKPOL BIT(21) +#define IMX21LCDC_LPCR_LPPOL BIT(22) +#define IMX21LCDC_LPCR_FLMPOL BIT(23) +#define IMX21LCDC_LPCR_PIXPOL BIT(24) +#define IMX21LCDC_LPCR_BPIX GENMASK(27, 25) +#define IMX21LCDC_LPCR_PBSIZ GENMASK(29, 28) +#define IMX21LCDC_LPCR_COLOR BIT(30) +#define IMX21LCDC_LPCR_TFT BIT(31) + +/* LCDC Horizontal Configuration Register */ +#define IMX21LCDC_LHCR 0x001c +#define IMX21LCDC_LHCR_H_WIDTH GENMASK(31, 26) +#define IMX21LCDC_LHCR_H_BPORCH GENMASK(7, 0) +#define IMX21LCDC_LHCR_H_FPORCH GENMASK(15, 8) + +/* LCDC Vertical Configuration Register */ +#define IMX21LCDC_LVCR 0x0020 +#define IMX21LCDC_LVCR_V_WIDTH GENMASK(31, 26) +#define IMX21LCDC_LVCR_V_BPORCH GENMASK(7, 0) +#define IMX21LCDC_LVCR_V_FPORCH GENMASK(15, 8) + +/* LCDC Panning Offset Register */ +#define IMX21LCDC_LPOR 0x0024 + +/* LCDC Sharp Configuration Register */ +#define IMX21LCDC_LSCR 0x0028 + +/* LCDC PWM Contrast Control Register */ +#define IMX21LCDC_LPCCR 0x002c + +/* LCDC DMA Control Register */ +#define IMX21LCDC_LDCR 0x0030 + +/* LCDC Refresh Mode Control Register */ +#define IMX21LCDC_LRMCR 0x0034 + +/* LCDC Interrupt Configuration Register */ +#define IMX21LCDC_LICR 0x0038 + +/* LCDC Interrupt Enable Register */ +#define IMX21LCDC_LIER 0x003c +#define IMX21LCDC_LIER_EOF BIT(1) + +/* LCDC Interrupt Status Register */ +#define IMX21LCDC_LISR 0x0040 +#define IMX21LCDC_LISR_EOF BIT(1) + +/* LCDC Graphic Window Start Address Register */ +#define IMX21LCDC_LGWSAR 0x0050 + +/* LCDC Graph Window Size Register */ +#define IMX21LCDC_LGWSR 0x0054 + +/* LCDC Graphic Window Virtual Page Width Register */ +#define IMX21LCDC_LGWVPWR 0x0058 + +/* LCDC Graphic Window Panning Offset Register */ +#define IMX21LCDC_LGWPOR 0x005c + +/* LCDC Graphic Window Position Register */ +#define IMX21LCDC_LGWPR 0x0060 + +/* LCDC Graphic Window Control Register */ +#define IMX21LCDC_LGWCR 0x0064 + +/* LCDC Graphic Window DMA Control Register */ +#define IMX21LCDC_LGWDCR 0x0068 + +/* LCDC AUS Mode Control Register */ +#define IMX21LCDC_LAUSCR 0x0080 + +/* LCDC AUS Mode Cursor Control Register */ +#define IMX21LCDC_LAUSCCR 0x0084 + +/* Background Lookup Table */ +#define IMX21LCDC_BGLUT 0x0800 + +/* Graphic Window Lookup Table */ +#define IMX21LCDC_GWLUT 0x0c00 + +#define BPP_RGB565 0x05 + +#define LCDC_MIN_XRES 64 +#define LCDC_MIN_YRES 64 + +#define LCDC_MAX_XRES 1024 +#define LCDC_MAX_YRES 1024 + +struct imx_lcdc { + struct drm_device drm; + struct drm_simple_display_pipe pipe; + const struct drm_display_mode *mode; + struct drm_connector connector; + struct drm_panel *panel; + struct drm_bridge *bridge; + void __iomem *base; + + struct clk *clk_ipg; + struct clk *clk_ahb; + struct clk *clk_per; +}; + +static const u32 imx_lcdc_formats[] = { + DRM_FORMAT_RGB565, +}; + +static inline struct imx_lcdc *drm_to_lcdc(struct drm_device *drm) +{ + return container_of(drm, struct imx_lcdc, drm); +} + +static unsigned int imx_lcdc_get_format(unsigned int drm_format) +{ + unsigned int bpp; + + switch (drm_format) { + default: + DRM_WARN("Format not supported - fallback to RGB565\n"); + fallthrough; + case DRM_FORMAT_RGB565: + bpp = BPP_RGB565; + break; + } + + return bpp; +} + +static int imx_lcdc_connector_get_modes(struct drm_connector *connector) +{ + struct imx_lcdc *lcdc = drm_to_lcdc(connector->dev); + + if (lcdc->panel) + return drm_panel_get_modes(lcdc->panel, connector); + + return 0; +} + +static const struct drm_connector_helper_funcs imx_lcdc_connector_hfuncs = { + .get_modes = imx_lcdc_connector_get_modes, +}; + +static const struct drm_connector_funcs imx_lcdc_connector_funcs = { + .reset = drm_atomic_helper_connector_reset, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = drm_connector_cleanup, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static void imx_lcdc_update_hw_registers(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *old_state, + bool mode_set) +{ + struct drm_crtc *crtc = &pipe->crtc; + struct drm_plane_state *new_state = pipe->plane.state; + struct drm_framebuffer *fb = new_state->fb; + struct imx_lcdc *lcdc = drm_to_lcdc(pipe->crtc.dev); + unsigned int bpp = imx_lcdc_get_format(fb->format->format); + unsigned int lvcr; /* LVCR-Register value */ + unsigned int lhcr; /* LHCR-Register value */ + unsigned int framesize; + dma_addr_t addr = drm_fb_cma_get_gem_addr(fb, new_state, 0); + + /* The LSSAR register specifies the LCD screen start address (SSA). */ + writel(addr, lcdc->base + IMX21LCDC_LSSAR); + + if (!mode_set) + return; + + /* Disable PER clock to make register write possible */ + if (old_state && old_state->crtc && old_state->crtc->enabled) + clk_disable_unprepare(lcdc->clk_per); + + /* Framesize */ + framesize = FIELD_PREP(IMX21LCDC_LSR_XMAX, crtc->mode.hdisplay / 16); + framesize |= FIELD_PREP(IMX21LCDC_LSR_YMAX, crtc->mode.vdisplay); + writel(framesize, lcdc->base + IMX21LCDC_LSR); + + /* HSYNC */ + lhcr = FIELD_PREP(IMX21LCDC_LHCR_H_FPORCH, crtc->mode.hsync_start - crtc->mode.hdisplay - 1); + lhcr |= FIELD_PREP(IMX21LCDC_LHCR_H_WIDTH, crtc->mode.hsync_end - crtc->mode.hsync_start - 1); + lhcr |= FIELD_PREP(IMX21LCDC_LHCR_H_BPORCH, crtc->mode.htotal - crtc->mode.hsync_end - 3); + writel(lhcr, lcdc->base + IMX21LCDC_LHCR); + + /* VSYNC */ + lvcr = FIELD_PREP(IMX21LCDC_LVCR_V_FPORCH, crtc->mode.vsync_start - crtc->mode.vdisplay); + lvcr |= FIELD_PREP(IMX21LCDC_LVCR_V_WIDTH, crtc->mode.vsync_end - crtc->mode.vsync_start); + lvcr |= FIELD_PREP(IMX21LCDC_LVCR_V_BPORCH, crtc->mode.vtotal - crtc->mode.vsync_end); + writel(lvcr, lcdc->base + IMX21LCDC_LVCR); + + writel(readl(lcdc->base + IMX21LCDC_LPCR) | FIELD_PREP(IMX21LCDC_LPCR_BPIX, bpp), + lcdc->base + IMX21LCDC_LPCR); + + /* Virtual Page Width */ + writel(new_state->fb->pitches[0] / 4, lcdc->base + IMX21LCDC_LVPWR); + + /* Enable PER clock */ + if (new_state->crtc->enabled) + clk_prepare_enable(lcdc->clk_per); +} + +static void imx_lcdc_pipe_enable(struct drm_simple_display_pipe *pipe, + struct drm_crtc_state *crtc_state, + struct drm_plane_state *plane_state) +{ + int ret; + int clk_div; + int bpp; + struct imx_lcdc *lcdc = drm_to_lcdc(pipe->crtc.dev); + struct drm_display_mode *mode = &pipe->crtc.mode; + struct drm_display_info *disp_info = &pipe->connector->display_info; + const int hsync_pol = (mode->flags & DRM_MODE_FLAG_PHSYNC) ? 0 : 1; + const int vsync_pol = (mode->flags & DRM_MODE_FLAG_PVSYNC) ? 0 : 1; + const int data_enable_pol = + (disp_info->bus_flags & DRM_BUS_FLAG_DE_HIGH) ? 0 : 1; + const int clk_pol = + (disp_info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE) ? 0 : 1; + + drm_panel_prepare(lcdc->panel); + + clk_div = DIV_ROUND_CLOSEST_ULL(clk_get_rate(lcdc->clk_per), + mode->clock * 1000); + bpp = imx_lcdc_get_format(plane_state->fb->format->format); + + writel(FIELD_PREP(IMX21LCDC_LPCR_PCD, clk_div - 1) | + FIELD_PREP(IMX21LCDC_LPCR_LPPOL, hsync_pol) | + FIELD_PREP(IMX21LCDC_LPCR_FLMPOL, vsync_pol) | + FIELD_PREP(IMX21LCDC_LPCR_OEPOL, data_enable_pol) | + FIELD_PREP(IMX21LCDC_LPCR_TFT, 1) | + FIELD_PREP(IMX21LCDC_LPCR_COLOR, 1) | + FIELD_PREP(IMX21LCDC_LPCR_PBSIZ, 3) | + FIELD_PREP(IMX21LCDC_LPCR_BPIX, bpp) | + FIELD_PREP(IMX21LCDC_LPCR_SCLKSEL, 1) | + FIELD_PREP(IMX21LCDC_LPCR_PIXPOL, 0) | + FIELD_PREP(IMX21LCDC_LPCR_CLKPOL, clk_pol), + lcdc->base + IMX21LCDC_LPCR); + + /* 0px panning offset */ + writel(0x0, lcdc->base + IMX21LCDC_LPOR); + + /* disable hardware cursor */ + writel(readl(lcdc->base + IMX21LCDC_LCPR) & ~IMX21LCDC_LCPR_CC, + lcdc->base + IMX21LCDC_LCPR); + + ret = clk_prepare_enable(lcdc->clk_ipg); + if (ret) { + dev_err(pipe->crtc.dev->dev, "Cannot enable ipg clock: %pe\n", ERR_PTR(ret)); + return; + } + ret = clk_prepare_enable(lcdc->clk_ahb); + if (ret) { + dev_err(pipe->crtc.dev->dev, "Cannot enable ahb clock: %pe\n", ERR_PTR(ret)); + clk_disable_unprepare(lcdc->clk_ipg); + return; + } + + imx_lcdc_update_hw_registers(pipe, NULL, true); + drm_panel_enable(lcdc->panel); + + /* Enable VBLANK Interrupt */ + writel(IMX21LCDC_LIER_EOF, lcdc->base + IMX21LCDC_LIER); +} + +static void imx_lcdc_pipe_disable(struct drm_simple_display_pipe *pipe) +{ + struct imx_lcdc *lcdc = drm_to_lcdc(pipe->crtc.dev); + struct drm_panel *panel = lcdc->panel; + struct drm_crtc *crtc = &lcdc->pipe.crtc; + struct drm_pending_vblank_event *event; + + drm_panel_disable(panel); + + clk_disable_unprepare(lcdc->clk_ahb); + clk_disable_unprepare(lcdc->clk_ipg); + + if (pipe->crtc.enabled) + clk_disable_unprepare(lcdc->clk_per); + + drm_panel_unprepare(panel); + + spin_lock_irq(&lcdc->drm.event_lock); + event = crtc->state->event; + if (event) { + crtc->state->event = NULL; + drm_crtc_send_vblank_event(crtc, event); + } + spin_unlock_irq(&lcdc->drm.event_lock); + + /* Disable VBLANK Interrupt */ + writel(0, lcdc->base + IMX21LCDC_LIER); +} + +static int imx_lcdc_pipe_check(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *plane_state, + struct drm_crtc_state *crtc_state) +{ + const struct drm_display_mode *mode = &crtc_state->mode; + + if ((mode->hdisplay < LCDC_MIN_XRES || mode->hdisplay > LCDC_MAX_XRES) || + (mode->vdisplay < LCDC_MIN_YRES || mode->vdisplay > LCDC_MAX_YRES) || + (mode->hdisplay % 16)) { + DRM_ERROR("unsupported display mode (%u x %u)\n", + mode->hdisplay, mode->vdisplay); + return -EINVAL; + } + + if (!FIELD_FIT(IMX21LCDC_LHCR_H_FPORCH, mode->hsync_start - mode->hdisplay - 1) || + !FIELD_FIT(IMX21LCDC_LHCR_H_WIDTH, mode->hsync_end - mode->hsync_start - 1) || + !FIELD_FIT(IMX21LCDC_LHCR_H_BPORCH, mode->htotal - mode->hsync_end - 3)) { + DRM_ERROR("invalid HSYNC setting (htotal = %hu, hsync_start = %hu, hsync_end = %hu, hdisplay = %hu)\n", + mode->htotal, mode->hsync_start, mode->hsync_end, mode->hdisplay); + return -EINVAL; + } + if (!FIELD_FIT(IMX21LCDC_LVCR_V_FPORCH, mode->vsync_start - mode->vdisplay) || + !FIELD_FIT(IMX21LCDC_LVCR_V_WIDTH, mode->vsync_end - mode->vsync_start) || + !FIELD_FIT(IMX21LCDC_LVCR_V_BPORCH, mode->vtotal - mode->vsync_end)) { + DRM_ERROR("invalid VSYNC setting (vtotal = %hu, vsync_start = %hu, vsync_end = %hu, vdisplay = %hu)\n", + mode->vtotal, mode->vsync_start, mode->vsync_end, mode->vdisplay); + return -EINVAL; + + } + + if (plane_state->fb->pitches[0] % 4) { + DRM_ERROR("invalid pitches setting (%hu)\n", plane_state->fb->pitches[0]); + return -EINVAL; + } + + crtc_state->mode_changed = + crtc_state->mode.hdisplay != pipe->crtc.state->mode.hdisplay || + crtc_state->mode.vdisplay != pipe->crtc.state->mode.vdisplay || + plane_state->fb->pitches[0] != pipe->plane.state->fb->pitches[0]; + + return 0; +} + +static void imx_lcdc_pipe_update(struct drm_simple_display_pipe *pipe, + struct drm_plane_state *old_state) +{ + struct drm_crtc *crtc = &pipe->crtc; + struct drm_pending_vblank_event *event = crtc->state->event; + struct drm_plane_state *new_state = pipe->plane.state; + struct drm_framebuffer *fb = new_state->fb; + struct drm_framebuffer *old_fb = old_state->fb; + struct drm_crtc *old_crtc = old_state->crtc; + bool mode_changed = false; + + if (old_fb && old_fb->format != fb->format) + mode_changed = true; + else if (old_crtc != crtc) + mode_changed = true; + else if (crtc->state->mode_changed) + mode_changed = true; + + imx_lcdc_update_hw_registers(pipe, old_state, mode_changed); + + if (event) { + crtc->state->event = NULL; + + spin_lock_irq(&crtc->dev->event_lock); + + if (crtc->state->active && drm_crtc_vblank_get(crtc) == 0) + drm_crtc_arm_vblank_event(crtc, event); + else + drm_crtc_send_vblank_event(crtc, event); + + spin_unlock_irq(&crtc->dev->event_lock); + } +} + +static const struct drm_simple_display_pipe_funcs imx_lcdc_pipe_funcs = { + .enable = imx_lcdc_pipe_enable, + .disable = imx_lcdc_pipe_disable, + .check = imx_lcdc_pipe_check, + .update = imx_lcdc_pipe_update, + .prepare_fb = drm_gem_simple_display_pipe_prepare_fb, +}; + +static const struct drm_mode_config_funcs imx_lcdc_mode_config_funcs = { + .fb_create = drm_gem_fb_create_with_dirty, + .atomic_check = drm_atomic_helper_check, + .atomic_commit = drm_atomic_helper_commit, +}; + +static const struct drm_mode_config_helper_funcs imx_lcdc_mode_config_helpers = { + .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, +}; + +DEFINE_DRM_GEM_CMA_FOPS(imx_lcdc_drm_fops); + +static struct drm_driver imx_lcdc_drm_driver = { + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, + .fops = &imx_lcdc_drm_fops, + DRM_GEM_CMA_DRIVER_OPS_VMAP, + .name = "imx-lcdc", + .desc = "i.MX LCDC driver", + .date = "20200716", +}; + +static const struct of_device_id imx_lcdc_of_dev_id[] = { + { .compatible = "fsl,imx21-lcdc", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, imx_lcdc_of_dev_id); + +static irqreturn_t irq_handler(int irq, void *arg) +{ + struct imx_lcdc *lcdc = (struct imx_lcdc *)arg; + struct drm_crtc *crtc = &lcdc->pipe.crtc; + unsigned int status; + + status = readl(lcdc->base + IMX21LCDC_LISR); + + if (status & IMX21LCDC_LISR_EOF) { + drm_crtc_handle_vblank(crtc); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int imx_lcdc_probe(struct platform_device *pdev) +{ + struct imx_lcdc *lcdc; + struct drm_device *drm; + int irq; + int ret; + struct device *dev = &pdev->dev; + + lcdc = devm_drm_dev_alloc(&pdev->dev, &imx_lcdc_drm_driver, + struct imx_lcdc, drm); + if (!lcdc) + return -ENOMEM; + + drm = &lcdc->drm; + + lcdc->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(lcdc->base)) + return PTR_ERR(lcdc->base); + + /* Panel */ + ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &lcdc->panel, &lcdc->bridge); + if (ret) + return dev_err_probe(dev, ret, "Failed to find panel or bridge\n"); + + /* Get Clocks */ + lcdc->clk_ipg = devm_clk_get(dev, "ipg"); + if (IS_ERR(lcdc->clk_ipg)) + return dev_err_probe(dev, PTR_ERR(lcdc->clk_ipg), "Failed to get ipg clk\n"); + + lcdc->clk_ahb = devm_clk_get(dev, "ahb"); + if (IS_ERR(lcdc->clk_ahb)) + return dev_err_probe(dev, PTR_ERR(lcdc->clk_ipg), "Failed to get ahb clk\n"); + + lcdc->clk_per = devm_clk_get(dev, "per"); + if (IS_ERR(lcdc->clk_per)) + return dev_err_probe(dev, PTR_ERR(lcdc->clk_ipg), "Failed to get ahb clk\n"); + + ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); + if (ret) + return dev_err_probe(drm->dev, ret, "Failed to set DMA Mask.\n"); + + /* Modeset init */ + ret = drmm_mode_config_init(drm); + if (ret) + return dev_err_probe(drm->dev, ret, "Failed to initialized mode setting.\n"); + + /* CRTC, Plane, Encoder */ + ret = drm_simple_display_pipe_init(drm, &lcdc->pipe, &imx_lcdc_pipe_funcs, imx_lcdc_formats, + ARRAY_SIZE(imx_lcdc_formats), NULL, &lcdc->connector); + if (ret < 0) + return dev_err_probe(drm->dev, ret, "Cannot setup simple display pipe\n"); + + ret = drm_vblank_init(drm, drm->mode_config.num_crtc); + if (ret < 0) + return dev_err_probe(drm->dev, ret, "Failed to initialize vblank\n"); + + if (lcdc->bridge) { + ret = drm_simple_display_pipe_attach_bridge(&lcdc->pipe, + lcdc->bridge); + if (ret) + return dev_err_probe(drm->dev, ret, "Cannot connect bridge\n"); + } + + /* Connector */ + drm_connector_helper_add(&lcdc->connector, &imx_lcdc_connector_hfuncs); + drm_connector_init(drm, &lcdc->connector, &imx_lcdc_connector_funcs, + DRM_MODE_CONNECTOR_DPI); + + /* + * The LCDC controller does not have an enable bit. The + * controller starts directly when the clocks are enabled. + * If the clocks are enabled when the controller is not yet + * programmed with proper register values (enabled at the + * bootloader, for example) then it just goes into some undefined + * state. + * To avoid this issue, let's enable and disable LCDC IPG, + * PER and AHB clock so that we force some kind of 'reset' + * to the LCDC block. + */ + + ret = clk_prepare_enable(lcdc->clk_ipg); + if (ret) + return dev_err_probe(dev, ret, "Cannot enable ipg clock\n"); + clk_disable_unprepare(lcdc->clk_ipg); + + ret = clk_prepare_enable(lcdc->clk_per); + if (ret) + return dev_err_probe(dev, ret, "Cannot enable per clock\n"); + clk_disable_unprepare(lcdc->clk_per); + + ret = clk_prepare_enable(lcdc->clk_ahb); + if (ret) + return dev_err_probe(dev, ret, "Cannot enable ahb clock\n"); + clk_disable_unprepare(lcdc->clk_ahb); + + drm->mode_config.min_width = LCDC_MIN_XRES; + drm->mode_config.max_width = LCDC_MAX_XRES; + drm->mode_config.min_height = LCDC_MIN_YRES; + drm->mode_config.max_height = LCDC_MAX_YRES; + drm->mode_config.preferred_depth = 16; + drm->mode_config.funcs = &imx_lcdc_mode_config_funcs; + drm->mode_config.helper_private = &imx_lcdc_mode_config_helpers; + + drm_mode_config_reset(drm); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + return ret; + } + + ret = devm_request_irq(dev, irq, irq_handler, 0, "imx-lcdc", lcdc); + if (ret < 0) + return dev_err_probe(drm->dev, ret, "Failed to install IRQ handler\n"); + + platform_set_drvdata(pdev, drm); + + ret = drm_dev_register(&lcdc->drm, 0); + if (ret) + return dev_err_probe(dev, ret, "Cannot register device\n"); + + drm_fbdev_generic_setup(drm, 0); + + return 0; +} + +static int imx_lcdc_remove(struct platform_device *pdev) +{ + struct imx_lcdc *lcdc = drm_to_lcdc(platform_get_drvdata(pdev)); + + drm_dev_unregister(&lcdc->drm); + drm_atomic_helper_shutdown(&lcdc->drm); + + return 0; +} + +static void imx_lcdc_shutdown(struct platform_device *pdev) +{ + drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); +} + +static struct platform_driver imx_lcdc_driver = { + .driver = { + .name = "imx-lcdc", + .of_match_table = imx_lcdc_of_dev_id, + }, + .probe = imx_lcdc_probe, + .remove = imx_lcdc_remove, + .shutdown = imx_lcdc_shutdown, +}; +module_platform_driver(imx_lcdc_driver); + +MODULE_AUTHOR("Marian Cichy kernel@pengutronix.de"); +MODULE_DESCRIPTION("Freescale i.MX LCDC driver"); +MODULE_LICENSE("GPL");