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SubjectRe: [PATCH v2 22/25] drm/mediatek: adjust ddp clock control flow
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Hi, Yongqiang:

On Wed, 2019-03-27 at 14:19 +0800, yongqiang.niu@mediatek.com wrote:
> From: Yongqiang Niu <yongqiang.niu@mediatek.com>
>
> display hardware clock will not unprepare when
> crtc is disable, until crtc is destroyed.
> with this patch, hard clock will disable and unprepare
> at the same time.

Reviewed-by: CK Hu <ck.hu@mediatek.com>

>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 26 ++++++--------------------
> 1 file changed, 6 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 0f97ee3..606c6e2 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -195,7 +195,7 @@ static int mtk_crtc_ddp_clk_enable(struct mtk_drm_crtc *mtk_crtc)
>
> DRM_DEBUG_DRIVER("%s\n", __func__);
> for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
> - ret = clk_enable(mtk_crtc->ddp_comp[i]->clk);
> + ret = clk_prepare_enable(mtk_crtc->ddp_comp[i]->clk);
> if (ret) {
> DRM_ERROR("Failed to enable clock %d: %d\n", i, ret);
> goto err;
> @@ -205,7 +205,7 @@ static int mtk_crtc_ddp_clk_enable(struct mtk_drm_crtc *mtk_crtc)
> return 0;
> err:
> while (--i >= 0)
> - clk_disable(mtk_crtc->ddp_comp[i]->clk);
> + clk_disable_unprepare(mtk_crtc->ddp_comp[i]->clk);
> return ret;
> }
>
> @@ -215,7 +215,7 @@ static void mtk_crtc_ddp_clk_disable(struct mtk_drm_crtc *mtk_crtc)
>
> DRM_DEBUG_DRIVER("%s\n", __func__);
> for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
> - clk_disable(mtk_crtc->ddp_comp[i]->clk);
> + clk_disable_unprepare(mtk_crtc->ddp_comp[i]->clk);
> }
>
> static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
> @@ -615,15 +615,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> if (!comp) {
> dev_err(dev, "Component %pOF not initialized\n", node);
> ret = -ENODEV;
> - goto unprepare;
> - }
> -
> - ret = clk_prepare(comp->clk);
> - if (ret) {
> - dev_err(dev,
> - "Failed to prepare clock for component %pOF: %d\n",
> - node, ret);
> - goto unprepare;
> + return ret;
> }
>
> mtk_crtc->ddp_comp[i] = comp;
> @@ -649,23 +641,17 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> ret = mtk_plane_init(drm_dev, &mtk_crtc->planes[zpos],
> BIT(pipe), type);
> if (ret)
> - goto unprepare;
> + return ret;
> }
>
> ret = mtk_drm_crtc_init(drm_dev, mtk_crtc, &mtk_crtc->planes[0],
> mtk_crtc->layer_nr > 1 ? &mtk_crtc->planes[1] :
> NULL, pipe);
> if (ret < 0)
> - goto unprepare;
> + 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);
> priv->num_pipes++;
>
> return 0;
> -
> -unprepare:
> - while (--i >= 0)
> - clk_unprepare(mtk_crtc->ddp_comp[i]->clk);
> -
> - return ret;
> }


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