This is MT8173 gamma & dither support PATCH v2, based on 4.7-rc1.
Changes since v1: -According to the suggestion from Daniel, we used the new atomic color management. -Applied gamma function at GAMMA engine (path 2). -Made dithering function support hardware mirroring well. -Removed the bpc variable from mtk_drm_crtc struct.
Bibby Hsieh (2): drm/mediatek: Add gamma correction drm/mediatek: set mt8173 dithering function
drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 3 +- drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 3 +- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 26 ++++- drivers/gpu/drm/mediatek/mtk_drm_crtc.h | 1 + drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 147 ++++++++++++++++++++++++++- drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 16 ++- 6 files changed, 184 insertions(+), 12 deletions(-)
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@mediatek.com --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 8 +++ drivers/gpu/drm/mediatek/mtk_drm_crtc.h | 1 + drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 89 ++++++++++++++++++++++++++- drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 10 +++ 4 files changed, 106 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index 24aa3ba..ee219bb 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -409,6 +409,10 @@ 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 +422,7 @@ 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 = { @@ -569,6 +574,9 @@ 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); + drm_helper_crtc_enable_color_mgmt(&mtk_crtc->base, MTK_LUT_SIZE, + 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..56c5894 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 +39,21 @@ #define DISP_COLOR_WIDTH 0x0c50 #define DISP_COLOR_HEIGHT 0x0c54
+#define DISP_AAL_EN 0x000 +#define DISP_AAL_SIZE 0x030 + +#define DISP_GAMMA_EN 0x000 +#define DISP_GAMMA_CFG 0x020 +#define DISP_GAMMA_SIZE 0x030 +#define DISP_GAMMA_LUT 0x700 + +#define LUT_10BIT_MASK 0x3ff + +#define AAL_EN BIT(0) + +#define GAMMA_EN BIT(0) +#define GAMMA_LUT_EN BIT(1) + #define OD_RELAY_MODE BIT(0)
#define UFO_BYPASS BIT(2) @@ -76,6 +92,61 @@ 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_config(struct mtk_ddp_comp *comp, unsigned int w, + unsigned int h, unsigned int vrefresh) +{ + writel(h << 16 | w, comp->regs + DISP_GAMMA_SIZE); +} + +static void mtk_gamma_start(struct mtk_ddp_comp *comp) +{ + writel(GAMMA_EN, comp->regs + DISP_GAMMA_EN); +} + +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_color = { .config = mtk_color_config, .start = mtk_color_start, @@ -90,6 +161,20 @@ 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 struct mtk_ddp_comp_funcs ddp_gamma = { + .gamma_set = mtk_gamma_set, + .config = mtk_gamma_config, + .start = mtk_gamma_start, + .stop = mtk_gamma_stop, +}; + static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = { [MTK_DISP_OVL] = "ovl", [MTK_DISP_RDMA] = "rdma", @@ -112,13 +197,13 @@ 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 }, [DDP_COMPONENT_DSI0] = { MTK_DSI, 0, NULL }, [DDP_COMPONENT_DSI1] = { MTK_DSI, 1, NULL }, - [DDP_COMPONENT_GAMMA] = { MTK_DISP_GAMMA, 0, NULL }, + [DDP_COMPONENT_GAMMA] = { MTK_DISP_GAMMA, 0, &ddp_gamma }, [DDP_COMPONENT_OD] = { MTK_DISP_OD, 0, &ddp_od }, [DDP_COMPONENT_OVL0] = { MTK_DISP_OVL, 0, NULL }, [DDP_COMPONENT_OVL1] = { MTK_DISP_OVL, 1, 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..07e17fe 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h @@ -20,6 +20,7 @@ struct device; struct device_node; struct drm_crtc; struct drm_device; +struct drm_crtc_state; struct mtk_plane_state;
enum mtk_ddp_comp_type { @@ -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,
Some panels only accept bpc (bit per color) 6-bit. But, the default bpc in mt8173 display data path is 8-bit. If we didn't enable dithering function to convert bpc, display cannot show the smooth grayscale image.
In mt8173, the dithering function in OD (OverDrive) and GAMMA module, we have to config them with connector->display_mode.bpc when CRTC initial.
1. Clear the default value at *_DITHER_5 and *_DITHER_7 register. 2. Calculate the LSB_ERR_SHIFT bits and ADD_LSHIFT bits two values. i.e. Input bpc of OD is 10 bits, we assume the bpc of panel is 6-bit, so, we need to set 4-bit to LSB_ERR_SHIFT and ADD_LSHIFT bits respectively. 3. Then, set the OD or GAMMA to dithering mode depends on path-1 or path-2.
Signed-off-by: Bibby Hsieh bibby.hsieh@mediatek.com --- drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 3 +- drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 3 +- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 18 ++++++-- drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 62 +++++++++++++++++++++++++-- drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 6 +-- 5 files changed, 80 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c index 8f62671f..019b7ca 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c @@ -103,7 +103,8 @@ static void mtk_ovl_stop(struct mtk_ddp_comp *comp) }
static void mtk_ovl_config(struct mtk_ddp_comp *comp, unsigned int w, - unsigned int h, unsigned int vrefresh) + unsigned int h, unsigned int vrefresh, + unsigned int bpc) { if (w != 0 && h != 0) writel_relaxed(h << 16 | w, comp->regs + DISP_REG_OVL_ROI_SIZE); diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c index 5fb80cb..0df05f9 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c @@ -106,7 +106,8 @@ static void mtk_rdma_stop(struct mtk_ddp_comp *comp) }
static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width, - unsigned int height, unsigned int vrefresh) + unsigned int height, unsigned int vrefresh, + unsigned int bpc) { unsigned int threshold; unsigned int reg; diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index ee219bb..9f78e6a 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -222,7 +222,9 @@ static void mtk_crtc_ddp_clk_disable(struct mtk_drm_crtc *mtk_crtc) static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc) { struct drm_crtc *crtc = &mtk_crtc->base; - unsigned int width, height, vrefresh; + struct drm_connector *connector; + struct drm_encoder *encoder; + unsigned int width, height, vrefresh, bpc = 0; int ret; int i;
@@ -233,6 +235,16 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc) width = crtc->state->adjusted_mode.hdisplay; height = crtc->state->adjusted_mode.vdisplay; vrefresh = crtc->state->adjusted_mode.vrefresh; + drm_for_each_encoder(encoder, crtc->dev) { + if (encoder->crtc != crtc) + continue; + drm_for_each_connector(connector, crtc->dev) { + if (connector->encoder != encoder) + continue; + if (bpc == 0 || bpc > connector->display_info.bpc) + bpc = connector->display_info.bpc; + } + }
ret = pm_runtime_get_sync(crtc->dev->dev); if (ret < 0) { @@ -266,7 +278,7 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc) for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) { struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[i];
- mtk_ddp_comp_config(comp, width, height, vrefresh); + mtk_ddp_comp_config(comp, width, height, vrefresh, bpc); mtk_ddp_comp_start(comp); }
@@ -469,7 +481,7 @@ void mtk_crtc_ddp_irq(struct drm_crtc *crtc, struct mtk_ddp_comp *ovl) if (state->pending_config) { mtk_ddp_comp_config(ovl, state->pending_width, state->pending_height, - state->pending_vrefresh); + state->pending_vrefresh, 0);
state->pending_config = false; } diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c index 56c5894..50c08b9 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c @@ -47,22 +47,45 @@ #define DISP_GAMMA_SIZE 0x030 #define DISP_GAMMA_LUT 0x700
+#define DISP_DITHER_5 0x0114 +#define DISP_DITHER_7 0x011c +#define DISP_DITHER_15 0x013c +#define DISP_DITHER_16 0x0140 + #define LUT_10BIT_MASK 0x3ff
#define AAL_EN BIT(0)
#define GAMMA_EN BIT(0) #define GAMMA_LUT_EN BIT(1) +#define GAMMA_DITHERING BIT(2)
#define OD_RELAY_MODE BIT(0) +#define OD_DITHERING BIT(2)
#define UFO_BYPASS BIT(2)
#define COLOR_BYPASS_ALL BIT(7) #define COLOR_SEQ_SEL BIT(13)
+#define DITHERING_ALGORITHM_EN BIT(0) + +#define DITHERING_LSB_ERR_SHIFT_R(bits) ((bits) << 28) +#define DITHERING_OVFLW_R(bits) ((bits) << 24) +#define DITHERING_ADD_LSHIFT_R(bits) ((bits) << 20) +#define DITHERING_INPUT_RSHIFT_R(bits) ((bits) << 16) +#define DITHERING_LSB_ERR_SHIFT_B(bits) ((bits) << 28) +#define DITHERING_OVFLW_B(bits) ((bits) << 24) +#define DITHERING_ADD_LSHIFT_B(bits) ((bits) << 20) +#define DITHERING_INPUT_RSHIFT_B(bits) ((bits) << 16) +#define DITHERING_LSB_ERR_SHIFT_G(bits) ((bits) << 12) +#define DITHERING_OVFLW_G(bits) ((bits) << 8) +#define DITHERING_ADD_LSHIFT_G(bits) ((bits) << 4) +#define DITHERING_INPUT_RSHIFT_G(bits) (bits) + static void mtk_color_config(struct mtk_ddp_comp *comp, unsigned int w, - unsigned int h, unsigned int vrefresh) + unsigned int h, unsigned int vrefresh, + unsigned int bpc) { writel(w, comp->regs + DISP_COLOR_WIDTH); writel(h, comp->regs + DISP_COLOR_HEIGHT); @@ -76,9 +99,25 @@ static void mtk_color_start(struct mtk_ddp_comp *comp) }
static void mtk_od_config(struct mtk_ddp_comp *comp, unsigned int w, - unsigned int h, unsigned int vrefresh) + unsigned int h, unsigned int vrefresh, + unsigned int bpc) { writel(w << 16 | h, comp->regs + DISP_OD_SIZE); + if (bpc < 10) { + writel(0, comp->regs + DISP_DITHER_5); + writel(0, comp->regs + DISP_DITHER_7); + writel(DITHERING_LSB_ERR_SHIFT_R(10 - bpc) | + DITHERING_ADD_LSHIFT_R(10 - bpc) | + DITHERING_ALGORITHM_EN, comp->regs + DISP_DITHER_15); + writel(DITHERING_LSB_ERR_SHIFT_B(10 - bpc) | + DITHERING_ADD_LSHIFT_B(10 - bpc) | + DITHERING_LSB_ERR_SHIFT_G(10 - bpc) | + DITHERING_ADD_LSHIFT_G(10 - bpc), + comp->regs + DISP_DITHER_16); + writel(OD_DITHERING, comp->regs + DISP_OD_CFG); + } else { + writel(OD_RELAY_MODE, comp->regs + DISP_OD_CFG); + } }
static void mtk_od_start(struct mtk_ddp_comp *comp) @@ -93,7 +132,8 @@ static void mtk_ufoe_start(struct mtk_ddp_comp *comp) }
static void mtk_aal_config(struct mtk_ddp_comp *comp, unsigned int w, - unsigned int h, unsigned int vrefresh) + unsigned int h, unsigned int vrefresh, + unsigned int bpc) { writel(h << 16 | w, comp->regs + DISP_AAL_SIZE); } @@ -109,9 +149,23 @@ static void mtk_aal_stop(struct mtk_ddp_comp *comp) }
static void mtk_gamma_config(struct mtk_ddp_comp *comp, unsigned int w, - unsigned int h, unsigned int vrefresh) + unsigned int h, unsigned int vrefresh, + unsigned int bpc) { writel(h << 16 | w, comp->regs + DISP_GAMMA_SIZE); + if (bpc < 10) { + writel(0, comp->regs + DISP_DITHER_5); + writel(0, comp->regs + DISP_DITHER_7); + writel(DITHERING_LSB_ERR_SHIFT_R(10 - bpc) | + DITHERING_ADD_LSHIFT_R(10 - bpc) | + DITHERING_ALGORITHM_EN, comp->regs + DISP_DITHER_15); + writel(DITHERING_LSB_ERR_SHIFT_B(10 - bpc) | + DITHERING_ADD_LSHIFT_B(10 - bpc) | + DITHERING_LSB_ERR_SHIFT_G(10 - bpc) | + DITHERING_ADD_LSHIFT_G(10 - bpc), + comp->regs + DISP_DITHER_16); + writel(GAMMA_DITHERING, comp->regs + DISP_GAMMA_CFG); + } }
static void mtk_gamma_start(struct mtk_ddp_comp *comp) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h index 07e17fe..c7c2e92 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h @@ -65,7 +65,7 @@ struct mtk_ddp_comp;
struct mtk_ddp_comp_funcs { void (*config)(struct mtk_ddp_comp *comp, unsigned int w, - unsigned int h, unsigned int vrefresh); + unsigned int h, unsigned int vrefresh, unsigned int bpc); void (*start)(struct mtk_ddp_comp *comp); void (*stop)(struct mtk_ddp_comp *comp); void (*enable_vblank)(struct mtk_ddp_comp *comp, struct drm_crtc *crtc); @@ -89,10 +89,10 @@ struct mtk_ddp_comp {
static inline void mtk_ddp_comp_config(struct mtk_ddp_comp *comp, unsigned int w, unsigned int h, - unsigned int vrefresh) + unsigned int vrefresh, unsigned int bpc) { if (comp->funcs && comp->funcs->config) - comp->funcs->config(comp, w, h, vrefresh); + comp->funcs->config(comp, w, h, vrefresh, bpc); }
static inline void mtk_ddp_comp_start(struct mtk_ddp_comp *comp)
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Bibby Hsieh