Re: [PATCH v1] drm/mediatek: add ctm property support

From: CK Hu
Date: Mon Dec 02 2019 - 03:24:12 EST


Hi, Yongqiang:

On Mon, 2019-12-02 at 15:31 +0800, yongqiang.niu@xxxxxxxxxxxx wrote:
> From: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>
>
> add ctm property support
>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 7 +++-
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 59 ++++++++++++++++++++++++++++-
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 9 +++++
> 3 files changed, 72 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 4fb346c..e7e3aa9 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -666,10 +666,13 @@ static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> int i;
>
> if (crtc->state->color_mgmt_changed)
> - for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
> + for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
> mtk_ddp_gamma_set(mtk_crtc->ddp_comp[i],
> crtc->state,
> mtk_crtc_state->cmdq_handle);
> + mtk_ddp_ctm_set(mtk_crtc->ddp_comp[i], crtc->state);

This patch is based on another patch which support cmdq. So I think this
patch would also support cmdq.

> + }
> +
> #ifdef CONFIG_MTK_CMDQ
> if (mtk_crtc->cmdq_client) {
> drm_atomic_state_get(old_atomic_state);
> @@ -891,7 +894,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> if (ret < 0)
> return ret;
> 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);
> + drm_crtc_enable_color_mgmt(&mtk_crtc->base, 0, true, MTK_LUT_SIZE);

Only MT8183 has CCORR, I think you should enable ctm by SoC. (gamma has
the same problem)

> priv->num_pipes++;
> #ifdef CONFIG_MTK_CMDQ
> mtk_crtc->cmdq_client =
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 9cc12af..4bbbac7 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -38,7 +38,15 @@
> #define CCORR_EN BIT(0)
> #define DISP_CCORR_CFG 0x0020
> #define CCORR_RELAY_MODE BIT(0)
> +#define CCORR_ENGINE_EN BIT(1)
> +#define CCORR_GAMMA_OFF BIT(2)
> +#define CCORR_WGAMUT_SRC_CLIP BIT(3)
> #define DISP_CCORR_SIZE 0x0030
> +#define DISP_CCORR_COEF_0 0x0080
> +#define DISP_CCORR_COEF_1 0x0084
> +#define DISP_CCORR_COEF_2 0x0088
> +#define DISP_CCORR_COEF_3 0x008C
> +#define DISP_CCORR_COEF_4 0x0090
>
> #define DISP_DITHER_EN 0x0000
> #define DITHER_EN BIT(0)
> @@ -187,7 +195,7 @@ static void mtk_ccorr_config(struct mtk_ddp_comp *comp, unsigned int w,
> unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
> {
> mtk_ddp_write(cmdq_pkt, h << 16 | w, comp, DISP_CCORR_SIZE);
> - mtk_ddp_write(cmdq_pkt, CCORR_RELAY_MODE, comp, DISP_CCORR_CFG);
> + mtk_ddp_write(cmdq_pkt, CCORR_ENGINE_EN, comp, DISP_CCORR_CFG);
> }
>
> static void mtk_ccorr_start(struct mtk_ddp_comp *comp)
> @@ -200,6 +208,54 @@ static void mtk_ccorr_stop(struct mtk_ddp_comp *comp)
> writel_relaxed(0x0, comp->regs + DISP_CCORR_EN);
> }
>
> +/* Converts a DRM S31.32 value to the HW S0.11 format. */
> +static u16 mtk_ctm_s31_32_to_s0_11(u64 in)
> +{
> + u16 r;
> +
> + /* Sign bit. */
> + r = in & BIT_ULL(63) ? BIT(11) : 0;
> +
> + if ((in & GENMASK_ULL(62, 33)) > 0) {

if ((in & GENMASK_ULL(62, 32)) > 0) {

> + /* We have zero integer bits so we can only saturate here. */
> + r |= GENMASK(10, 0);
> + } else {
> + /* Otherwise take the 9 most important fractional bits. */
> + r |= (in >> 22) & GENMASK(10, 0);

r |= (in >> 21) & GENMASK(10, 0);

Regards,
CK

> + }
> +
> + return r;
> +}
> +
> +static void mtk_ccorr_ctm_set(struct mtk_ddp_comp *comp,
> + struct drm_crtc_state *state)
> +{
> + struct drm_property_blob *blob = state->ctm;
> + struct drm_color_ctm *ctm;
> + const u64 *input;
> + uint16_t coeffs[9] = { 0 };
> + int i;
> +
> + if (!blob)
> + return;
> +
> + ctm = (struct drm_color_ctm *)blob->data;
> + input = ctm->matrix;
> +
> + for (i = 0; i < ARRAY_SIZE(coeffs); i++)
> + coeffs[i] = mtk_ctm_s31_32_to_s0_11(input[i]);
> +
> + writel_relaxed(coeffs[0] << 16 | coeffs[1],
> + comp->regs + DISP_CCORR_COEF_0);
> + writel_relaxed(coeffs[2] << 16 | coeffs[3],
> + comp->regs + DISP_CCORR_COEF_1);
> + writel_relaxed(coeffs[4] << 16 | coeffs[5],
> + comp->regs + DISP_CCORR_COEF_2);
> + writel_relaxed(coeffs[6] << 16 | coeffs[7],
> + comp->regs + DISP_CCORR_COEF_3);
> + writel_relaxed(coeffs[8] << 16, comp->regs + DISP_CCORR_COEF_4);
> +}
> +
> static void mtk_dither_config(struct mtk_ddp_comp *comp, unsigned int w,
> unsigned int h, unsigned int vrefresh,
> unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
> @@ -269,6 +325,7 @@ static void mtk_gamma_set(struct mtk_ddp_comp *comp,
> .config = mtk_ccorr_config,
> .start = mtk_ccorr_start,
> .stop = mtk_ccorr_stop,
> + .ctm_set = mtk_ccorr_ctm_set,
> };
>
> static const struct mtk_ddp_comp_funcs ddp_dither = {
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index 5b0a3d4..5100c3d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -95,6 +95,8 @@ struct mtk_ddp_comp_funcs {
> struct cmdq_pkt *cmdq_pkt);
> void (*bgclr_in_on)(struct mtk_ddp_comp *comp);
> void (*bgclr_in_off)(struct mtk_ddp_comp *comp);
> + void (*ctm_set)(struct mtk_ddp_comp *comp,
> + struct drm_crtc_state *state);
> };
>
> struct mtk_ddp_comp {
> @@ -213,6 +215,13 @@ static inline void mtk_ddp_comp_bgclr_in_off(struct mtk_ddp_comp *comp)
> comp->funcs->bgclr_in_off(comp);
> }
>
> +static inline void mtk_ddp_ctm_set(struct mtk_ddp_comp *comp,
> + struct drm_crtc_state *state)
> +{
> + if (comp->funcs && comp->funcs->ctm_set)
> + comp->funcs->ctm_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,