From 2f3f4dda747c0619594d13996e65598ab675c60c Mon Sep 17 00:00:00 2001 From: Bibby Hsieh Date: Thu, 28 Jul 2016 10:22:54 +0800 Subject: [PATCH] drm/mediatek: Add gamma correction. Add gamma set function to correct brightness values. It applies arbitrary mapping curve to compensate the incorrect transfer function of the panel. Signed-off-by: Bibby Hsieh Signed-off-by: Philipp Zabel --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 7 ++++- drivers/gpu/drm/mediatek/mtk_drm_crtc.h | 1 + drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 31 +++++++++++++++++++++ drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 10 +++++++ 4 files changed, 48 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index 24aa3bad1e76..e3ac2802e024 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -409,6 +409,9 @@ static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc, } if (pending_planes) mtk_crtc->pending_planes = true; + if (crtc->state->color_mgmt_changed) + for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) + mtk_ddp_gamma_set(mtk_crtc->ddp_comp[i], crtc->state); } static const struct drm_crtc_funcs mtk_crtc_funcs = { @@ -418,6 +421,7 @@ static const struct drm_crtc_funcs mtk_crtc_funcs = { .reset = mtk_drm_crtc_reset, .atomic_duplicate_state = mtk_drm_crtc_duplicate_state, .atomic_destroy_state = mtk_drm_crtc_destroy_state, + .gamma_set = drm_atomic_helper_legacy_gamma_set, }; static const struct drm_crtc_helper_funcs mtk_crtc_helper_funcs = { @@ -568,7 +572,8 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev, &mtk_crtc->planes[1].base, pipe); if (ret < 0) goto unprepare; - + drm_mode_crtc_set_gamma_size(&mtk_crtc->base, MTK_LUT_SIZE); + drm_crtc_enable_color_mgmt(&mtk_crtc->base, 0, false, MTK_LUT_SIZE); priv->crtc[pipe] = &mtk_crtc->base; priv->num_pipes++; diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h index 81e5566ec82f..d332564065e3 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h @@ -19,6 +19,7 @@ #include "mtk_drm_plane.h" #define OVL_LAYER_NR 4 +#define MTK_LUT_SIZE 512 int mtk_drm_crtc_enable_vblank(struct drm_device *drm, unsigned int pipe); void mtk_drm_crtc_disable_vblank(struct drm_device *drm, unsigned int pipe); diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c index ba895c8fd91d..42cd587d6b9b 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c @@ -24,6 +24,7 @@ #include "mtk_drm_drv.h" #include "mtk_drm_plane.h" #include "mtk_drm_ddp_comp.h" +#include "mtk_drm_crtc.h" #define DISP_OD_EN 0x0000 #define DISP_OD_INTEN 0x0008 @@ -42,7 +43,11 @@ #define DISP_AAL_SIZE 0x0030 #define DISP_GAMMA_EN 0x0000 +#define DISP_GAMMA_CFG 0x0020 #define DISP_GAMMA_SIZE 0x0030 +#define DISP_GAMMA_LUT 0x0700 + +#define LUT_10BIT_MASK 0x03ff #define OD_RELAY_MODE BIT(0) @@ -54,6 +59,7 @@ #define AAL_EN BIT(0) #define GAMMA_EN BIT(0) +#define GAMMA_LUT_EN BIT(1) static void mtk_color_config(struct mtk_ddp_comp *comp, unsigned int w, unsigned int h, unsigned int vrefresh) @@ -118,13 +124,38 @@ static void mtk_gamma_stop(struct mtk_ddp_comp *comp) writel_relaxed(0x0, comp->regs + DISP_GAMMA_EN); } +static void mtk_gamma_set(struct mtk_ddp_comp *comp, + struct drm_crtc_state *state) +{ + unsigned int i, reg; + struct drm_color_lut *lut; + void __iomem *lut_base; + u32 word; + + if (state->gamma_lut) { + reg = readl(comp->regs + DISP_GAMMA_CFG); + reg = reg | GAMMA_LUT_EN; + writel(reg, comp->regs + DISP_GAMMA_CFG); + lut_base = comp->regs + DISP_GAMMA_LUT; + lut = (struct drm_color_lut *)state->gamma_lut->data; + for (i = 0; i < MTK_LUT_SIZE; i++) { + word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) + + (((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) + + ((lut[i].blue >> 6) & LUT_10BIT_MASK); + writel(word, (lut_base + i * 4)); + } + } +} + static const struct mtk_ddp_comp_funcs ddp_aal = { + .gamma_set = mtk_gamma_set, .config = mtk_aal_config, .start = mtk_aal_start, .stop = mtk_aal_stop, }; static const struct mtk_ddp_comp_funcs ddp_gamma = { + .gamma_set = mtk_gamma_set, .config = mtk_gamma_config, .start = mtk_gamma_start, .stop = mtk_gamma_stop, diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h index 6b13ba97094d..f4b7e0ae7379 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h @@ -21,6 +21,7 @@ struct device_node; struct drm_crtc; struct drm_device; struct mtk_plane_state; +struct drm_crtc_state; enum mtk_ddp_comp_type { MTK_DISP_OVL, @@ -73,6 +74,8 @@ struct mtk_ddp_comp_funcs { void (*layer_off)(struct mtk_ddp_comp *comp, unsigned int idx); void (*layer_config)(struct mtk_ddp_comp *comp, unsigned int idx, struct mtk_plane_state *state); + void (*gamma_set)(struct mtk_ddp_comp *comp, + struct drm_crtc_state *state); }; struct mtk_ddp_comp { @@ -139,6 +142,13 @@ static inline void mtk_ddp_comp_layer_config(struct mtk_ddp_comp *comp, comp->funcs->layer_config(comp, idx, state); } +static inline void mtk_ddp_gamma_set(struct mtk_ddp_comp *comp, + struct drm_crtc_state *state) +{ + if (comp->funcs && comp->funcs->gamma_set) + comp->funcs->gamma_set(comp, state); +} + int mtk_ddp_comp_get_id(struct device_node *node, enum mtk_ddp_comp_type comp_type); int mtk_ddp_comp_init(struct device *dev, struct device_node *comp_node, -- 2.30.2