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SubjectRe: [PATCH v1, 2/2] drm/mediatek: Fix external display vblank timeout issue
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Hi, Yongqiang:

I would like the title could clearly express what does this patch do. I
think what this patch do is to implement prepare/unprepare interface for
dpi driver. And you could describe why do this in commit message.


On Wed, 2019-11-27 at 09:17 +0800, yongqiang.niu@mediatek.com wrote:
> From: Yongqiang Niu <yongqiang.niu@mediatek.com>
>
> Fix external display vblank timeout issue

I think you move dpi_power_on to more early stage. But why this would
fix vblank timeout. Please describe more about this so that I would
agree this patch.

This is a bug fix, so please add a 'Fixes' tag.

>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_dpi.c | 14 +++++++++-----
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 6 ++++++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 14 ++++++++++++++
> 3 files changed, 29 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index be6d95c..38cabbe 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -387,8 +387,12 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
> {
> int ret;
>
> - if (++dpi->refcount != 1)
> + if (++dpi->refcount != 1) {
> + dev_warn(dpi->dev, "%s refcount: %d\n", __func__, dpi->refcount);
> return 0;
> + }
> +
> + DRM_DEBUG_DRIVER("%s refcount %d\n", __func__, dpi->refcount);
>
> ret = clk_prepare_enable(dpi->engine_clk);
> if (ret) {
> @@ -563,14 +567,14 @@ static int mtk_dpi_atomic_check(struct drm_encoder *encoder,
> .atomic_check = mtk_dpi_atomic_check,
> };
>
> -static void mtk_dpi_start(struct mtk_ddp_comp *comp)
> +static void mtk_dpi_prepare(struct mtk_ddp_comp *comp)
> {
> struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);
>
> mtk_dpi_power_on(dpi);
> }
>
> -static void mtk_dpi_stop(struct mtk_ddp_comp *comp)
> +static void mtk_dpi_unprepare(struct mtk_ddp_comp *comp)
> {
> struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);
>
> @@ -578,8 +582,8 @@ static void mtk_dpi_stop(struct mtk_ddp_comp *comp)
> }
>
> static const struct mtk_ddp_comp_funcs mtk_dpi_funcs = {
> - .start = mtk_dpi_start,
> - .stop = mtk_dpi_stop,
> + .prepare = mtk_dpi_prepare,
> + .unprepare = mtk_dpi_unprepare,
> };
>
> static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 7eca02f..a6d3d97 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -345,6 +345,9 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
> return ret;
> }
>
> + for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
> + mtk_ddp_comp_prepare(mtk_crtc->ddp_comp[i]);
> +
> ret = mtk_disp_mutex_prepare(mtk_crtc->mutex);
> if (ret < 0) {
> DRM_ERROR("Failed to enable mutex clock: %d\n", ret);
> @@ -434,6 +437,9 @@ static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *mtk_crtc)
> mtk_crtc_ddp_clk_disable(mtk_crtc);
> mtk_disp_mutex_unprepare(mtk_crtc->mutex);
>
> + for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
> + mtk_ddp_comp_unprepare(mtk_crtc->ddp_comp[i]);
> +
> pm_runtime_put(drm->dev);
>
> if (crtc->state->event && !crtc->state->active) {
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index 5b0a3d4..097b90d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -78,6 +78,8 @@ struct mtk_ddp_comp_funcs {
> void (*stop)(struct mtk_ddp_comp *comp);
> void (*enable_vblank)(struct mtk_ddp_comp *comp, struct drm_crtc *crtc);
> void (*disable_vblank)(struct mtk_ddp_comp *comp);
> + void (*prepare)(struct mtk_ddp_comp *comp);
> + void (*unprepare)(struct mtk_ddp_comp *comp);
> unsigned int (*supported_rotations)(struct mtk_ddp_comp *comp);
> unsigned int (*layer_nr)(struct mtk_ddp_comp *comp);
> void (*layer_on)(struct mtk_ddp_comp *comp, unsigned int idx,
> @@ -117,6 +119,18 @@ static inline void mtk_ddp_comp_config(struct mtk_ddp_comp *comp,
> comp->funcs->config(comp, w, h, vrefresh, bpc, cmdq_pkt);
> }
>
> +static inline void mtk_ddp_comp_prepare(struct mtk_ddp_comp *comp)
> +{
> + if (comp->funcs && comp->funcs->prepare)
> + comp->funcs->prepare(comp);
> +}
> +
> +static inline void mtk_ddp_comp_unprepare(struct mtk_ddp_comp *comp)
> +{
> + if (comp->funcs && comp->funcs->unprepare)
> + comp->funcs->unprepare(comp);
> +}
> +
> static inline void mtk_ddp_comp_start(struct mtk_ddp_comp *comp)
> {
> if (comp->funcs && comp->funcs->start)

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