[PATCH 1/2] drm/mediatek: Add gamma correction
From: Bibby Hsieh
Date: Mon Jun 13 2016 - 22:56:43 EST
Apply gamma function to correct brightness values.
It applies arbitrary mapping curve to compensate the
incorrect transfer function of the panel.
Signed-off-by: Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 12 ++++++
drivers/gpu/drm/mediatek/mtk_drm_crtc.h | 1 +
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 56 ++++++++++++++++++++++++++-
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 9 +++++
4 files changed, 77 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 24aa3ba..1b38406 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -127,6 +127,16 @@ static void mtk_drm_crtc_reset(struct drm_crtc *crtc)
state->base.crtc = crtc;
}
+static void mtk_crtc_gamma_set(struct drm_crtc *crtc, u16 *r,
+ u16 *g, u16 *b, uint32_t start, uint32_t size)
+{
+ struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
+ unsigned int i;
+
+ for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
+ mtk_ddp_gamma_set(mtk_crtc->ddp_comp[i], r, g, b, start, size);
+}
+
static struct drm_crtc_state *mtk_drm_crtc_duplicate_state(struct drm_crtc *crtc)
{
struct mtk_crtc_state *state;
@@ -418,6 +428,7 @@ 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 = mtk_crtc_gamma_set,
};
static const struct drm_crtc_helper_funcs mtk_crtc_helper_funcs = {
@@ -569,6 +580,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
if (ret < 0)
goto unprepare;
+ drm_mode_crtc_set_gamma_size(&mtk_crtc->base, 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 81e5566..d332564 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 3970fcf..3fd5141 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
@@ -38,6 +39,18 @@
#define DISP_COLOR_WIDTH 0x0c50
#define DISP_COLOR_HEIGHT 0x0c54
+#define DISP_AAL_EN 0x000
+#define DISP_AAL_SIZE 0x030
+
+#define DISP_GAMMA_CFG 0x020
+#define DISP_GAMMA_LUT 0x700
+
+#define LUT_10BIT_MASK 0x3ff
+
+#define AAL_EN BIT(0)
+
+#define GAMMA_LUT_EN BIT(1)
+
#define OD_RELAY_MODE BIT(0)
#define UFO_BYPASS BIT(2)
@@ -76,6 +89,40 @@ static void mtk_ufoe_start(struct mtk_ddp_comp *comp)
writel(UFO_BYPASS, comp->regs + DISP_REG_UFO_START);
}
+static void mtk_aal_config(struct mtk_ddp_comp *comp, unsigned int w,
+ unsigned int h, unsigned int vrefresh)
+{
+ writel(h << 16 | w, comp->regs + DISP_AAL_SIZE);
+}
+
+static void mtk_aal_start(struct mtk_ddp_comp *comp)
+{
+ writel(AAL_EN, comp->regs + DISP_AAL_EN);
+}
+
+static void mtk_aal_stop(struct mtk_ddp_comp *comp)
+{
+ writel_relaxed(0x0, comp->regs + DISP_AAL_EN);
+}
+
+static void mtk_gamma_set(struct mtk_ddp_comp *comp, u16 *r, u16 *g,
+ u16 *b, uint32_t start, uint32_t size)
+{
+ int i;
+ unsigned int lut;
+ int end = (start + size > MTK_LUT_SIZE) ? MTK_LUT_SIZE : start + size;
+ void __iomem *lut_base;
+
+ writel(GAMMA_LUT_EN, comp->regs + DISP_GAMMA_CFG);
+ lut_base = comp->regs + DISP_GAMMA_LUT;
+ for (i = start; i < end; i++) {
+ lut = (((r[i] >> 6) & LUT_10BIT_MASK) << 20) +
+ (((g[i] >> 6) & LUT_10BIT_MASK) << 10) +
+ ((b[i] >> 6) & LUT_10BIT_MASK);
+ writel(lut, (lut_base + i * 4));
+ }
+}
+
static const struct mtk_ddp_comp_funcs ddp_color = {
.config = mtk_color_config,
.start = mtk_color_start,
@@ -90,6 +137,13 @@ static const struct mtk_ddp_comp_funcs ddp_ufoe = {
.start = mtk_ufoe_start,
};
+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 char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
[MTK_DISP_OVL] = "ovl",
[MTK_DISP_RDMA] = "rdma",
@@ -112,7 +166,7 @@ struct mtk_ddp_comp_match {
};
static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
- [DDP_COMPONENT_AAL] = { MTK_DISP_AAL, 0, NULL },
+ [DDP_COMPONENT_AAL] = { MTK_DISP_AAL, 0, &ddp_aal },
[DDP_COMPONENT_COLOR0] = { MTK_DISP_COLOR, 0, &ddp_color },
[DDP_COMPONENT_COLOR1] = { MTK_DISP_COLOR, 1, &ddp_color },
[DDP_COMPONENT_DPI0] = { MTK_DPI, 0, NULL },
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
index 6b13ba9..0832179 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
@@ -73,6 +73,8 @@ 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, u16 *r, u16 *g, u16 *b,
+ u32 start, u32 size);
};
struct mtk_ddp_comp {
@@ -139,6 +141,13 @@ 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, u16 *r, u16 *g,
+ u16 *b, uint32_t start, uint32_t size)
+{
+ if (comp->funcs && comp->funcs->gamma_set)
+ comp->funcs->gamma_set(comp, r, g, b, start, size);
+}
+
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,
--
1.7.9.5