[PATCH v9 03/16] drm/mediatek: gamma: Support SoC specific LUT size

From: AngeloGioacchino Del Regno
Date: Thu Aug 03 2023 - 07:03:15 EST

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Newer SoCs support a bigger Gamma LUT table: wire up a callback
to retrieve the correct LUT size for each different Gamma IP.

Co-developed-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>
Signed-off-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>
[Angelo: Rewritten commit message/description + porting]
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Reviewed-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>
Reviewed-by: Alexandre Mergnat <amergnat@xxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_disp_aal.c | 17 ++++++++++++++-
drivers/gpu/drm/mediatek/mtk_disp_drv.h | 2 ++
drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 23 ++++++++++++++++++---
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 | 2 ++
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 9 ++++++++
7 files changed, 55 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_aal.c b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
index 2f602f1f1c49..e2e4155faf01 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
@@ -19,7 +19,7 @@
#define AAL_EN BIT(0)
#define DISP_AAL_SIZE 0x0030
#define DISP_AAL_OUTPUT_SIZE 0x04d8
-
+#define DISP_AAL_LUT_SIZE 512

struct mtk_disp_aal_data {
bool has_gamma;
@@ -61,6 +61,21 @@ void mtk_aal_config(struct device *dev, unsigned int w,
mtk_ddp_write(cmdq_pkt, w << 16 | h, &aal->cmdq_reg, aal->regs, DISP_AAL_OUTPUT_SIZE);
}

+/**
+ * mtk_aal_gamma_get_lut_size() - Get gamma LUT size for AAL
+ * @dev: Pointer to struct device
+ *
+ * Return: 0 if gamma control not supported in AAL or gamma LUT size
+ */
+unsigned int mtk_aal_gamma_get_lut_size(struct device *dev)
+{
+ struct mtk_disp_aal *aal = dev_get_drvdata(dev);
+
+ if (aal->data && aal->data->has_gamma)
+ return DISP_AAL_LUT_SIZE;
+ return 0;
+}
+
void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state)
{
struct mtk_disp_aal *aal = dev_get_drvdata(dev);
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index 75045932353e..ca377265e5eb 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
@@ -17,6 +17,7 @@ void mtk_aal_clk_disable(struct device *dev);
void mtk_aal_config(struct device *dev, unsigned int w,
unsigned int h, unsigned int vrefresh,
unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
+unsigned int mtk_aal_gamma_get_lut_size(struct device *dev);
void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state);
void mtk_aal_start(struct device *dev);
void mtk_aal_stop(struct device *dev);
@@ -53,6 +54,7 @@ void mtk_gamma_clk_disable(struct device *dev);
void mtk_gamma_config(struct device *dev, unsigned int w,
unsigned int h, unsigned int vrefresh,
unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
+unsigned int mtk_gamma_get_lut_size(struct device *dev);
void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state);
void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crtc_state *state);
void mtk_gamma_start(struct device *dev);
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
index 47751864bd5c..7575237625d2 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
@@ -24,10 +24,12 @@
#define DISP_GAMMA_LUT 0x0700

#define LUT_10BIT_MASK 0x03ff
+#define LUT_SIZE_DEFAULT 512

struct mtk_disp_gamma_data {
bool has_dither;
bool lut_diff;
+ u16 lut_size;
};

/*
@@ -54,6 +56,15 @@ void mtk_gamma_clk_disable(struct device *dev)
clk_disable_unprepare(gamma->clk);
}

+unsigned int mtk_gamma_get_lut_size(struct device *dev)
+{
+ struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
+
+ if (gamma && gamma->data)
+ return gamma->data->lut_size;
+ return LUT_SIZE_DEFAULT;
+}
+
void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crtc_state *state)
{
struct mtk_disp_gamma *gamma;
@@ -61,6 +72,7 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
struct drm_color_lut *lut;
void __iomem *lut_base;
bool lut_diff;
+ u16 lut_size;
u32 word;
u32 diff[3] = {0};

@@ -71,17 +83,20 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
/* If we're called from AAL, dev is NULL */
gamma = dev ? dev_get_drvdata(dev) : NULL;

- if (gamma && gamma->data)
+ if (gamma && gamma->data) {
lut_diff = gamma->data->lut_diff;
- else
+ lut_size = gamma->data->lut_size;
+ } else {
lut_diff = false;
+ lut_size = LUT_SIZE_DEFAULT;
+ }

reg = readl(regs + DISP_GAMMA_CFG);
reg = reg | GAMMA_LUT_EN;
writel(reg, regs + DISP_GAMMA_CFG);
lut_base = regs + DISP_GAMMA_LUT;
lut = (struct drm_color_lut *)state->gamma_lut->data;
- for (i = 0; i < MTK_LUT_SIZE; i++) {
+ for (i = 0; i < lut_size; i++) {
if (!lut_diff || (i % 2 == 0)) {
word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) +
(((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) +
@@ -198,10 +213,12 @@ static int mtk_disp_gamma_remove(struct platform_device *pdev)

static const struct mtk_disp_gamma_data mt8173_gamma_driver_data = {
.has_dither = true,
+ .lut_size = 512,
};

static const struct mtk_disp_gamma_data mt8183_gamma_driver_data = {
.lut_diff = true,
+ .lut_size = 512,
};

static const struct of_device_id mtk_disp_gamma_driver_dt_match[] = {
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 8a43656ecc30..ebe0cc3a1a4c 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -959,8 +959,12 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
mtk_crtc->ddp_comp[i] = comp;

if (comp->funcs) {
- if (comp->funcs->gamma_set)
- gamma_lut_size = MTK_LUT_SIZE;
+ if (comp->funcs->gamma_set && comp->funcs->gamma_get_lut_size) {
+ unsigned int lut_sz = mtk_ddp_gamma_get_lut_size(comp);
+
+ if (lut_sz)
+ gamma_lut_size = lut_sz;
+ }

if (comp->funcs->ctm_set)
has_ctm = true;
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
index 3e9046993d09..b2e50292e57d 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
@@ -10,7 +10,6 @@
#include "mtk_drm_ddp_comp.h"
#include "mtk_drm_plane.h"

-#define MTK_LUT_SIZE 512
#define MTK_MAX_BPC 10
#define MTK_MIN_BPC 3

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index f114da4d36a9..f3212e08f2cd 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -271,6 +271,7 @@ static void mtk_ufoe_start(struct device *dev)
static const struct mtk_ddp_comp_funcs ddp_aal = {
.clk_enable = mtk_aal_clk_enable,
.clk_disable = mtk_aal_clk_disable,
+ .gamma_get_lut_size = mtk_aal_gamma_get_lut_size,
.gamma_set = mtk_aal_gamma_set,
.config = mtk_aal_config,
.start = mtk_aal_start,
@@ -322,6 +323,7 @@ static const struct mtk_ddp_comp_funcs ddp_dsi = {
static const struct mtk_ddp_comp_funcs ddp_gamma = {
.clk_enable = mtk_gamma_clk_enable,
.clk_disable = mtk_gamma_clk_disable,
+ .gamma_get_lut_size = mtk_gamma_get_lut_size,
.gamma_set = mtk_gamma_set,
.config = mtk_gamma_config,
.start = mtk_gamma_start,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
index febcaeef16a1..c1355960e195 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
@@ -67,6 +67,7 @@ struct mtk_ddp_comp_funcs {
void (*layer_config)(struct device *dev, unsigned int idx,
struct mtk_plane_state *state,
struct cmdq_pkt *cmdq_pkt);
+ unsigned int (*gamma_get_lut_size)(struct device *dev);
void (*gamma_set)(struct device *dev,
struct drm_crtc_state *state);
void (*bgclr_in_on)(struct device *dev);
@@ -186,6 +187,14 @@ static inline void mtk_ddp_comp_layer_config(struct mtk_ddp_comp *comp,
comp->funcs->layer_config(comp->dev, idx, state, cmdq_pkt);
}

+static inline unsigned int mtk_ddp_gamma_get_lut_size(struct mtk_ddp_comp *comp)
+{
+ if (comp->funcs && comp->funcs->gamma_get_lut_size)
+ return comp->funcs->gamma_get_lut_size(comp->dev);
+
+ return 0;
+}
+
static inline void mtk_ddp_gamma_set(struct mtk_ddp_comp *comp,
struct drm_crtc_state *state)
{
--
2.41.0

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