Hi Laurent,
On 21/12/2020 01:57, Laurent Pinchart wrote:
> To prepare for CLU support, expend the CMM API exposed to the DU driver
s/expend/extend/ ...?
> to separate the LUT table pointer from the LUT update decision. This
> will be required, as we will need to update the LUT and CLU
> independently.
>
Aha, I see this has changed a little since I originally looked at this,
but that's probably a good thing.
> Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
> ---
> drivers/gpu/drm/rcar-du/rcar_cmm.c | 60 ++++++++++++--------------
> drivers/gpu/drm/rcar-du/rcar_cmm.h | 19 +++++---
> drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 22 +++++++---
> 3 files changed, 55 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c
> b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> index 382d53f8a22e..ccc8c8b03bac 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_cmm.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> @@ -42,23 +42,33 @@ static inline void rcar_cmm_write(struct rcar_cmm *rcmm,
> u32 reg, u32 data)
> iowrite32(data, rcmm->base + reg);
> }
>
> -/*
> - * rcar_cmm_lut_write() - Scale the DRM LUT table entries to hardware
> precision
> - * and write to the CMM registers
> - * @rcmm: Pointer to the CMM device
> - * @drm_lut: Pointer to the DRM LUT table
> - */
> -static void rcar_cmm_lut_write(struct rcar_cmm *rcmm,
> - const struct drm_color_lut *drm_lut)
> +static void rcar_cmm_lut_configure(struct rcar_cmm *rcmm,
> + const struct drm_color_lut *table)
> {
> - unsigned int i;
> + bool enable = !!table;
>
Ahh good, handling both enable and disable in here makes more sense. I
like it.
> - for (i = 0; i < CM2_LUT_SIZE; ++i) {
> - u32 entry = drm_color_lut_extract(drm_lut[i].red, 8) << 16
> - | drm_color_lut_extract(drm_lut[i].green, 8) << 8
> - | drm_color_lut_extract(drm_lut[i].blue, 8);
> + if (rcmm->lut.enabled != enable) {
> + rcar_cmm_write(rcmm, CM2_LUT_CTRL,
> + enable ? CM2_LUT_CTRL_LUT_EN : 0);
> + rcmm->lut.enabled = enable;
> + }
>
> - rcar_cmm_write(rcmm, CM2_LUT_TBL(i), entry);
> + if (table) {
> + unsigned int i;
> +
> + /*
> + * Scale the DRM LUT table entries to the hardware precision
> + * and program it.
> + */
> + for (i = 0; i < CM2_LUT_SIZE; ++i) {
> + const struct drm_color_lut *lut = &table[i];
> +
> + u32 entry = drm_color_lut_extract(lut->red, 8) << 16
> + | drm_color_lut_extract(lut->green, 8) << 8
> + | drm_color_lut_extract(lut->blue, 8);
> +
> + rcar_cmm_write(rcmm, CM2_LUT_TBL(i), entry);
> + }
> }
> }
>
> @@ -83,23 +93,8 @@ int rcar_cmm_setup(struct platform_device *pdev,
> {
> struct rcar_cmm *rcmm = platform_get_drvdata(pdev);
>
> - /* Disable LUT if no table is provided. */
> - if (!config->lut.table) {
> - if (rcmm->lut.enabled) {
> - rcar_cmm_write(rcmm, CM2_LUT_CTRL, 0);
> - rcmm->lut.enabled = false;
> - }
> -
> - return 0;
> - }
> -
> - /* Enable LUT and program the new gamma table values. */
> - if (!rcmm->lut.enabled) {
> - rcar_cmm_write(rcmm, CM2_LUT_CTRL, CM2_LUT_CTRL_LUT_EN);
> - rcmm->lut.enabled = true;
> - }
> -
> - rcar_cmm_lut_write(rcmm, config->lut.table);
> + if (config->lut.update)
> + rcar_cmm_lut_configure(rcmm, config->lut.table);
Does something need to reset config->lut.update to false?
Or is this structure reset / cleaned on each call?
Never mind, looks like this is always used from a fresh initialised
structure in rcar_du_cmm_setup().
>
> return 0;
> }
> @@ -144,8 +139,7 @@ void rcar_cmm_disable(struct platform_device *pdev)
> {
> struct rcar_cmm *rcmm = platform_get_drvdata(pdev);
>
> - rcar_cmm_write(rcmm, CM2_LUT_CTRL, 0);
> - rcmm->lut.enabled = false;
> + rcar_cmm_lut_configure(rcmm, NULL);
>
> pm_runtime_put(&pdev->dev);
> }
> diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.h
> b/drivers/gpu/drm/rcar-du/rcar_cmm.h
> index b5f7ec6db04a..f4b16535ec16 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_cmm.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.h
> @@ -13,16 +13,23 @@
> struct drm_color_lut;
> struct platform_device;
>
> +/**
> + * struct rcar_cmm_table_config - CMM LUT configuration
> + * @update: When true, update the LUT configuration.
> + * @table: Table data. The LUT is enabled if non-NULL, and disabled
> + * otherwise. The value is ignored if @update is false.
> + */
> +struct rcar_cmm_table_config {
> + bool update;
> + struct drm_color_lut *table;
> +};
> +
> /**
> * struct rcar_cmm_config - CMM configuration
> - *
> - * @lut: 1D-LUT configuration
> - * @lut.table: 1D-LUT table entries. Disable LUT operations when NULL
> + * @lut: 1D-LUT configuration
> */
> struct rcar_cmm_config {
> - struct {
> - struct drm_color_lut *table;
> - } lut;
> + struct rcar_cmm_table_config lut;
> };
>
> #if IS_ENABLED(CONFIG_DRM_RCAR_CMM)
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> index 9a099c0fe1d4..426b1870b3cb 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> @@ -500,17 +500,23 @@ static int rcar_du_cmm_check(struct drm_crtc *crtc,
> return 0;
> }
>
> -static void rcar_du_cmm_setup(struct drm_crtc *crtc)
> +static void rcar_du_cmm_setup(struct rcar_du_crtc *rcrtc,
> + const struct drm_crtc_state *old_state,
> + const struct drm_crtc_state *new_state)
> {
> - struct drm_property_blob *drm_lut = crtc->state->gamma_lut;
> - struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> struct rcar_cmm_config cmm_config = {};
>
> if (!rcrtc->cmm)
> return;
>
> - if (drm_lut)
> - cmm_config.lut.table = (struct drm_color_lut *)drm_lut->data;
> + if (!old_state ||
> + !old_state->gamma_lut != !new_state->gamma_lut ||
> + (old_state->gamma_lut && new_state->gamma_lut &&
> + old_state->gamma_lut->base.id != new_state->gamma_lut->base.id)) {
The conditional looks a bit terse, but it looks like it does the expected.
Everything else looks good to me.
Reviewed-by: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
> + cmm_config.lut.update = true;
> + cmm_config.lut.table = new_state->gamma_lut
> + ? new_state->gamma_lut->data : NULL;
> + }
>
> rcar_cmm_setup(rcrtc->cmm, &cmm_config);
> }
> @@ -744,7 +750,7 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc
> *crtc,
> * after the DU channel has been activated. Investigate the impact
> * of this restriction on the first displayed frame.
> */
> - rcar_du_cmm_setup(crtc);
> + rcar_du_cmm_setup(rcrtc, NULL, crtc->state);
> }
>
> static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
> @@ -781,6 +787,8 @@ static void rcar_du_crtc_atomic_disable(struct drm_crtc
> *crtc,
> static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc,
> struct drm_atomic_state *state)
> {
> + struct drm_crtc_state *old_state = drm_atomic_get_old_crtc_state(state,
> + crtc);
> struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
>
> WARN_ON(!crtc->state->enable);
> @@ -801,7 +809,7 @@ static void rcar_du_crtc_atomic_begin(struct drm_crtc
> *crtc,
>
> /* If the active state changed, we let .atomic_enable handle CMM. */
> if (crtc->state->color_mgmt_changed && !crtc->state->active_changed)
> - rcar_du_cmm_setup(crtc);
> + rcar_du_cmm_setup(rcrtc, old_state, crtc->state);
>
> if (rcar_du_has(rcrtc->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
> rcar_du_vsp_atomic_begin(rcrtc);
>
--
Regards
--
Kieran
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