MIC(Mobile image compressor) is newly added IP in Exynos5433. MIC resides between decon and mipi dsim, and compresses frame data by 50%. With dsi, not display port, to send frame data to the panel, the bandwidth is not enough. That is why this compressor is introduced.
Signed-off-by: Hyungwon Hwang human.hwang@samsung.com --- Changes for v2: - make mic driver to be registered by exynos drm driver instead as a module driver - change the description of mic driver in documentation - add module author at the top of the source file removing MODULE_OWNER, MODULE_DESCRIPTION, MODULE_LICENSE
Changes for v3: - move if statement out of function, so that the function is not called unnecessarily - Make it use syscon framework for controlling system register
Changes for v4: - None
Changes for v5: - None .../devicetree/bindings/video/exynos-mic.txt | 51 +++ drivers/gpu/drm/exynos/Kconfig | 6 + drivers/gpu/drm/exynos/Makefile | 1 + drivers/gpu/drm/exynos/exynos_drm_drv.c | 3 + drivers/gpu/drm/exynos/exynos_drm_drv.h | 1 + drivers/gpu/drm/exynos/exynos_drm_mic.c | 490 +++++++++++++++++++++ 6 files changed, 552 insertions(+) create mode 100644 Documentation/devicetree/bindings/video/exynos-mic.txt create mode 100644 drivers/gpu/drm/exynos/exynos_drm_mic.c
diff --git a/Documentation/devicetree/bindings/video/exynos-mic.txt b/Documentation/devicetree/bindings/video/exynos-mic.txt new file mode 100644 index 0000000..0fba2ee --- /dev/null +++ b/Documentation/devicetree/bindings/video/exynos-mic.txt @@ -0,0 +1,51 @@ +Device-Tree bindings for Samsung Exynos SoC mobile image compressor (MIC) + +MIC (mobile image compressor) resides between decon and mipi dsi. Mipi dsi is +not capable to transfer high resoltuion frame data as decon can send. MIC +solves this problem by compressing the frame data by 1/2 before it is +transferred through mipi dsi. The compressed frame data must be uncompressed in +the panel PCB. + +Required properties: +- compatible: value should be "samsung,exynos5433-mic". +- reg: physical base address and length of the MIC registers set and system + register of mic. +- clocks: must include clock specifiers corresponding to entries in the + clock-names property. +- clock-names: list of clock names sorted in the same order as the clocks + property. Must contain "pclk_mic0", "sclk_rgb_vclk_to_mic0". +- samsung,disp-syscon: the reference node for syscon for DISP block. +- ports: contains a port which is connected to decon node and dsi node. + address-cells and size-cells must 1 and 0, respectively. +- port: contains an endpoint node which is connected to the endpoint in the + decon node or dsi node. The reg value must be 0 and 1 respectively. + +Example: +SoC specific DT entry: +mic: mic@13930000 { + compatible = "samsung,exynos5433-mic"; + reg = <0x13930000 0x48>; + clocks = <&cmu_disp CLK_PCLK_MIC0>, + <&cmu_disp CLK_SCLK_RGB_VCLK_TO_MIC0>; + clock-names = "pclk_mic0", "sclk_rgb_vclk_to_mic0"; + samsung,disp-syscon = <&syscon_disp>; + + ports { + #address-cells = <1>; + #size-cells = <0>; + + port@0 { + reg = <0>; + mic_to_decon: endpoint { + remote-endpoint = <&decon_to_mic>; + }; + }; + + port@1 { + reg = <1>; + mic_to_dsi: endpoint { + remote-endpoint = <&dsi_to_mic>; + }; + }; + }; +}; diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig index dd6ae21..3f649ab 100644 --- a/drivers/gpu/drm/exynos/Kconfig +++ b/drivers/gpu/drm/exynos/Kconfig @@ -103,3 +103,9 @@ config DRM_EXYNOS_GSC depends on DRM_EXYNOS_IPP && ARCH_EXYNOS5 && !ARCH_MULTIPLATFORM help Choose this option if you want to use Exynos GSC for DRM. + +config DRM_EXYNOS_MIC + bool "Exynos DRM MIC" + depends on (DRM_EXYNOS && DRM_EXYNOS5433_DECON) + help + Choose this option if you want to use Exynos MIC for DRM. diff --git a/drivers/gpu/drm/exynos/Makefile b/drivers/gpu/drm/exynos/Makefile index fbd084d..7de0b10 100644 --- a/drivers/gpu/drm/exynos/Makefile +++ b/drivers/gpu/drm/exynos/Makefile @@ -22,5 +22,6 @@ exynosdrm-$(CONFIG_DRM_EXYNOS_IPP) += exynos_drm_ipp.o exynosdrm-$(CONFIG_DRM_EXYNOS_FIMC) += exynos_drm_fimc.o exynosdrm-$(CONFIG_DRM_EXYNOS_ROTATOR) += exynos_drm_rotator.o exynosdrm-$(CONFIG_DRM_EXYNOS_GSC) += exynos_drm_gsc.o +exynosdrm-$(CONFIG_DRM_EXYNOS_MIC) += exynos_drm_mic.o
obj-$(CONFIG_DRM_EXYNOS) += exynosdrm.o diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index 78ef497..105fc1a 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -535,6 +535,9 @@ static struct platform_driver *const exynos_drm_kms_drivers[] = { #ifdef CONFIG_DRM_EXYNOS7_DECON &decon_driver, #endif +#ifdef CONFIG_DRM_EXYNOS_MIC + &mic_driver, +#endif #ifdef CONFIG_DRM_EXYNOS_DP &dp_driver, #endif diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h index 147737a..4569847 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h @@ -355,4 +355,5 @@ extern struct platform_driver fimc_driver; extern struct platform_driver rotator_driver; extern struct platform_driver gsc_driver; extern struct platform_driver ipp_driver; +extern struct platform_driver mic_driver; #endif diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c new file mode 100644 index 0000000..8994eab --- /dev/null +++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c @@ -0,0 +1,490 @@ +/* + * Copyright (C) 2015 Samsung Electronics Co.Ltd + * Authors: + * Hyungwon Hwang human.hwang@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 Foundationr + */ + +#include <linux/platform_device.h> +#include <video/of_videomode.h> +#include <linux/of_address.h> +#include <video/videomode.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_graph.h> +#include <linux/clk.h> +#include <drm/drmP.h> +#include <linux/mfd/syscon.h> +#include <linux/regmap.h> + +/* Sysreg registers for MIC */ +#define DSD_CFG_MUX 0x1004 +#define MIC0_RGB_MUX (1 << 0) +#define MIC0_I80_MUX (1 << 1) +#define MIC0_ON_MUX (1 << 5) + +/* MIC registers */ +#define MIC_OP 0x0 +#define MIC_IP_VER 0x0004 +#define MIC_V_TIMING_0 0x0008 +#define MIC_V_TIMING_1 0x000C +#define MIC_IMG_SIZE 0x0010 +#define MIC_INPUT_TIMING_0 0x0014 +#define MIC_INPUT_TIMING_1 0x0018 +#define MIC_2D_OUTPUT_TIMING_0 0x001C +#define MIC_2D_OUTPUT_TIMING_1 0x0020 +#define MIC_2D_OUTPUT_TIMING_2 0x0024 +#define MIC_3D_OUTPUT_TIMING_0 0x0028 +#define MIC_3D_OUTPUT_TIMING_1 0x002C +#define MIC_3D_OUTPUT_TIMING_2 0x0030 +#define MIC_CORE_PARA_0 0x0034 +#define MIC_CORE_PARA_1 0x0038 +#define MIC_CTC_CTRL 0x0040 +#define MIC_RD_DATA 0x0044 + +#define MIC_UPD_REG (1 << 31) +#define MIC_ON_REG (1 << 30) +#define MIC_TD_ON_REG (1 << 29) +#define MIC_BS_CHG_OUT (1 << 16) +#define MIC_VIDEO_TYPE(x) (((x) & 0xf) << 12) +#define MIC_PSR_EN (1 << 5) +#define MIC_SW_RST (1 << 4) +#define MIC_ALL_RST (1 << 3) +#define MIC_CORE_VER_CONTROL (1 << 2) +#define MIC_MODE_SEL_COMMAND_MODE (1 << 1) +#define MIC_MODE_SEL_MASK (1 << 1) +#define MIC_CORE_EN (1 << 0) + +#define MIC_V_PULSE_WIDTH(x) (((x) & 0x3fff) << 16) +#define MIC_V_PERIOD_LINE(x) ((x) & 0x3fff) + +#define MIC_VBP_SIZE(x) (((x) & 0x3fff) << 16) +#define MIC_VFP_SIZE(x) ((x) & 0x3fff) + +#define MIC_IMG_V_SIZE(x) (((x) & 0x3fff) << 16) +#define MIC_IMG_H_SIZE(x) ((x) & 0x3fff) + +#define MIC_H_PULSE_WIDTH_IN(x) (((x) & 0x3fff) << 16) +#define MIC_H_PERIOD_PIXEL_IN(x) ((x) & 0x3fff) + +#define MIC_HBP_SIZE_IN(x) (((x) & 0x3fff) << 16) +#define MIC_HFP_SIZE_IN(x) ((x) & 0x3fff) + +#define MIC_H_PULSE_WIDTH_2D(x) (((x) & 0x3fff) << 16) +#define MIC_H_PERIOD_PIXEL_2D(x) ((x) & 0x3fff) + +#define MIC_HBP_SIZE_2D(x) (((x) & 0x3fff) << 16) +#define MIC_HFP_SIZE_2D(x) ((x) & 0x3fff) + +#define MIC_BS_SIZE_2D(x) ((x) & 0x3fff) + +enum { + ENDPOINT_DECON_NODE, + ENDPOINT_DSI_NODE, + NUM_ENDPOINTS +}; + +static char *clk_names[] = { "pclk_mic0", "sclk_rgb_vclk_to_mic0" }; +#define NUM_CLKS ARRAY_SIZE(clk_names) +static DEFINE_MUTEX(mic_mutex); + +struct exynos_mic { + struct device *dev; + void __iomem *reg; + struct regmap *sysreg; + struct clk *clks[NUM_CLKS]; + + bool i80_mode; + struct videomode vm; + struct drm_encoder *encoder; + struct drm_bridge bridge; + + bool enabled; +}; + +static void mic_set_path(struct exynos_mic *mic, bool enable) +{ + int ret; + unsigned int val; + + ret = regmap_read(mic->sysreg, DSD_CFG_MUX, &val); + if (ret) { + DRM_ERROR("mic: Failed to read system register\n"); + return; + } + + if (enable) { + if (mic->i80_mode) + val |= MIC0_I80_MUX; + else + val |= MIC0_RGB_MUX; + + val |= MIC0_ON_MUX; + } else + val &= ~(MIC0_RGB_MUX | MIC0_I80_MUX | MIC0_ON_MUX); + + regmap_write(mic->sysreg, DSD_CFG_MUX, val); + if (ret) + DRM_ERROR("mic: Failed to read system register\n"); +} + +static int mic_sw_reset(struct exynos_mic *mic) +{ + unsigned int retry = 100; + int ret; + + writel(MIC_SW_RST, mic->reg + MIC_OP); + + while (retry-- > 0) { + ret = readl(mic->reg + MIC_OP); + if (!(ret & MIC_SW_RST)) + return 0; + + udelay(10); + } + + return -ETIMEDOUT; +} + +static void mic_set_porch_timing(struct exynos_mic *mic) +{ + struct videomode vm = mic->vm; + u32 reg; + + reg = MIC_V_PULSE_WIDTH(vm.vsync_len) + + MIC_V_PERIOD_LINE(vm.vsync_len + vm.vactive + + vm.vback_porch + vm.vfront_porch); + writel(reg, mic->reg + MIC_V_TIMING_0); + + reg = MIC_VBP_SIZE(vm.vback_porch) + + MIC_VFP_SIZE(vm.vfront_porch); + writel(reg, mic->reg + MIC_V_TIMING_1); + + reg = MIC_V_PULSE_WIDTH(vm.hsync_len) + + MIC_V_PERIOD_LINE(vm.hsync_len + vm.hactive + + vm.hback_porch + vm.hfront_porch); + writel(reg, mic->reg + MIC_INPUT_TIMING_0); + + reg = MIC_VBP_SIZE(vm.hback_porch) + + MIC_VFP_SIZE(vm.hfront_porch); + writel(reg, mic->reg + MIC_INPUT_TIMING_1); +} + +static void mic_set_img_size(struct exynos_mic *mic) +{ + struct videomode *vm = &mic->vm; + u32 reg; + + reg = MIC_IMG_H_SIZE(vm->hactive) + + MIC_IMG_V_SIZE(vm->vactive); + + writel(reg, mic->reg + MIC_IMG_SIZE); +} + +static void mic_set_output_timing(struct exynos_mic *mic) +{ + struct videomode vm = mic->vm; + u32 reg, bs_size_2d; + + DRM_DEBUG("w: %u, h: %u\n", vm.hactive, vm.vactive); + bs_size_2d = ((vm.hactive >> 2) << 1) + (vm.vactive % 4); + reg = MIC_BS_SIZE_2D(bs_size_2d); + writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_2); + + if (!mic->i80_mode) { + reg = MIC_H_PULSE_WIDTH_2D(vm.hsync_len) + + MIC_H_PERIOD_PIXEL_2D(vm.hsync_len + bs_size_2d + + vm.hback_porch + vm.hfront_porch); + writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_0); + + reg = MIC_HBP_SIZE_2D(vm.hback_porch) + + MIC_H_PERIOD_PIXEL_2D(vm.hfront_porch); + writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_1); + } +} + +static void mic_set_reg_on(struct exynos_mic *mic, bool enable) +{ + u32 reg = readl(mic->reg + MIC_OP); + + if (enable) { + reg &= ~(MIC_MODE_SEL_MASK | MIC_CORE_VER_CONTROL | MIC_PSR_EN); + reg |= (MIC_CORE_EN | MIC_BS_CHG_OUT | MIC_ON_REG); + + reg &= ~MIC_MODE_SEL_COMMAND_MODE; + if (mic->i80_mode) + reg |= MIC_MODE_SEL_COMMAND_MODE; + } else { + reg &= ~MIC_CORE_EN; + } + + reg |= MIC_UPD_REG; + writel(reg, mic->reg + MIC_OP); +} + +static struct device_node *get_remote_node(struct device_node *from, int reg) +{ + struct device_node *endpoint = NULL, *remote_node = NULL; + + endpoint = of_graph_get_endpoint_by_regs(from, reg, -1); + if (!endpoint) { + DRM_ERROR("mic: Failed to find remote port from %s", + from->full_name); + goto exit; + } + + remote_node = of_graph_get_remote_port_parent(endpoint); + if (!remote_node) { + DRM_ERROR("mic: Failed to find remote port parent from %s", + from->full_name); + goto exit; + } + +exit: + of_node_put(endpoint); + return remote_node; +} + +static int parse_dt(struct exynos_mic *mic) +{ + int ret = 0, i, j; + struct device_node *remote_node; + struct device_node *nodes[3]; + + /* + * The order of endpoints does matter. + * The first node must be for decon and the second one must be for dsi. + */ + for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) { + remote_node = get_remote_node(mic->dev->of_node, i); + if (!remote_node) { + ret = -EPIPE; + goto exit; + } + nodes[j++] = remote_node; + + switch (i) { + case ENDPOINT_DECON_NODE: + /* decon node */ + if (of_get_child_by_name(remote_node, + "i80-if-timings")) + mic->i80_mode = 1; + + break; + case ENDPOINT_DSI_NODE: + /* panel node */ + remote_node = get_remote_node(remote_node, 1); + if (!remote_node) { + ret = -EPIPE; + goto exit; + } + nodes[j++] = remote_node; + + ret = of_get_videomode(remote_node, + &mic->vm, 0); + if (ret) { + DRM_ERROR("mic: failed to get videomode"); + goto exit; + } + + break; + default: + DRM_ERROR("mic: Unknown endpoint from MIC"); + break; + } + } + +exit: + while (--j > -1) + of_node_put(nodes[j]); + + return ret; +} + +void mic_disable(struct drm_bridge *bridge) { } + +void mic_post_disable(struct drm_bridge *bridge) +{ + struct exynos_mic *mic = bridge->driver_private; + int i; + + mutex_lock(&mic_mutex); + if (!mic->enabled) + goto already_disabled; + + mic_set_path(mic, 0); + + for (i = NUM_CLKS - 1; i > -1; i--) + clk_disable_unprepare(mic->clks[i]); + + mic->enabled = 0; + +already_disabled: + mutex_unlock(&mic_mutex); +} + +void mic_pre_enable(struct drm_bridge *bridge) +{ + struct exynos_mic *mic = bridge->driver_private; + int ret, i; + + mutex_lock(&mic_mutex); + if (mic->enabled) + goto already_enabled; + + for (i = 0; i < NUM_CLKS; i++) { + ret = clk_prepare_enable(mic->clks[i]); + if (ret < 0) { + DRM_ERROR("Failed to enable clock (%s)\n", + clk_names[i]); + goto turn_off_clks; + } + } + + mic_set_path(mic, 1); + + ret = mic_sw_reset(mic); + if (ret) { + DRM_ERROR("Failed to reset\n"); + goto turn_off_clks; + } + + if (!mic->i80_mode) + mic_set_porch_timing(mic); + mic_set_img_size(mic); + mic_set_output_timing(mic); + mic_set_reg_on(mic, 1); + mic->enabled = 1; + mutex_unlock(&mic_mutex); + + return; + +turn_off_clks: + while (--i > -1) + clk_disable_unprepare(mic->clks[i]); +already_enabled: + mutex_unlock(&mic_mutex); +} + +void mic_enable(struct drm_bridge *bridge) { } + +void mic_destroy(struct drm_bridge *bridge) +{ + struct exynos_mic *mic = bridge->driver_private; + int i; + + mutex_lock(&mic_mutex); + if (!mic->enabled) + goto already_disabled; + + for (i = NUM_CLKS - 1; i > -1; i--) + clk_disable_unprepare(mic->clks[i]); + +already_disabled: + mutex_unlock(&mic_mutex); +} + +struct drm_bridge_funcs mic_bridge_funcs = { + .disable = mic_disable, + .post_disable = mic_post_disable, + .pre_enable = mic_pre_enable, + .enable = mic_enable, +}; + +int exynos_mic_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct exynos_mic *mic; + struct resource res; + int ret, i; + + mic = devm_kzalloc(dev, sizeof(*mic), GFP_KERNEL); + if (!mic) { + DRM_ERROR("mic: Failed to allocate memory for MIC object\n"); + ret = -ENOMEM; + goto err; + } + + mic->dev = dev; + + ret = parse_dt(mic); + if (ret) + goto err; + + ret = of_address_to_resource(dev->of_node, 0, &res); + if (ret) { + DRM_ERROR("mic: Failed to get mem region for MIC\n"); + goto err; + } + mic->reg = devm_ioremap(dev, res.start, resource_size(&res)); + if (!mic->reg) { + DRM_ERROR("mic: Failed to remap for MIC\n"); + ret = -ENOMEM; + goto err; + } + + mic->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node, + "samsung,disp-syscon"); + if (IS_ERR(mic->sysreg)) { + DRM_ERROR("mic: Failed to get system register.\n"); + goto err; + } + + mic->bridge.funcs = &mic_bridge_funcs; + mic->bridge.of_node = dev->of_node; + mic->bridge.driver_private = mic; + ret = drm_bridge_add(&mic->bridge); + if (ret) { + DRM_ERROR("mic: Failed to add MIC to the global bridge list\n"); + goto err; + } + + for (i = 0; i < NUM_CLKS; i++) { + mic->clks[i] = of_clk_get_by_name(dev->of_node, clk_names[i]); + if (IS_ERR(mic->clks[i])) { + DRM_ERROR("mic: Failed to get clock (%s)\n", + clk_names[i]); + ret = PTR_ERR(mic->clks[i]); + goto err; + } + } + + DRM_DEBUG_KMS("MIC has been probed\n"); + +err: + return ret; +} + +static int exynos_mic_remove(struct platform_device *pdev) +{ + struct exynos_mic *mic = platform_get_drvdata(pdev); + int i; + + drm_bridge_remove(&mic->bridge); + + for (i = NUM_CLKS - 1; i > -1; i--) + clk_put(mic->clks[i]); + + return 0; +} + +static const struct of_device_id exynos_mic_of_match[] = { + { .compatible = "samsung,exynos5433-mic" }, + { } +}; +MODULE_DEVICE_TABLE(of, exynos_mic_of_match); + +struct platform_driver mic_driver = { + .probe = exynos_mic_probe, + .remove = exynos_mic_remove, + .driver = { + .name = "exynos-mic", + .owner = THIS_MODULE, + .of_match_table = exynos_mic_of_match, + }, +};