Hi, Hsiao-chien:
On Thu, 2023-10-19 at 13:56 +0800, Hsiao Chien Sung wrote:
> Display modules will be powered on when .atomic_enable(),
> there is no need to do it again in mtk_crtc_ddp_hw_init().
> Besides, the DRM devices are created manually when mtk-mmsys
> is probed and there is no power domain linked to it.
>
> Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC
> MT8173.")
>
> Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 18 +++---------------
> 1 file changed, 3 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index bc4cc75cca18..c7edd80be428 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -6,7 +6,6 @@
> #include <linux/clk.h>
> #include <linux/dma-mapping.h>
> #include <linux/mailbox_controller.h>
> -#include <linux/pm_runtime.h>
> #include <linux/soc/mediatek/mtk-cmdq.h>
> #include <linux/soc/mediatek/mtk-mmsys.h>
> #include <linux/soc/mediatek/mtk-mutex.h>
> @@ -362,22 +361,16 @@ static int mtk_crtc_ddp_hw_init(struct
> mtk_drm_crtc *mtk_crtc, struct drm_atomic
> drm_connector_list_iter_end(&conn_iter);
> }
>
> - ret = pm_runtime_resume_and_get(crtc->dev->dev);
crtc->dev->dev is mmsys device. In mt8173.dtsi, you could find that
mmsys has its own power. So I think we should keep this.
Regards,
CK
> - if (ret < 0) {
> - DRM_ERROR("Failed to enable power domain: %d\n", ret);
> - return ret;
> - }
> -
> ret = mtk_mutex_prepare(mtk_crtc->mutex);
> if (ret < 0) {
> DRM_ERROR("Failed to enable mutex clock: %d\n", ret);
> - goto err_pm_runtime_put;
> + goto error;
> }
>
> ret = mtk_crtc_ddp_clk_enable(mtk_crtc);
> if (ret < 0) {
> DRM_ERROR("Failed to enable component clocks: %d\n",
> ret);
> - goto err_mutex_unprepare;
> + goto error;
> }
>
> for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) {
> @@ -426,16 +419,13 @@ static int mtk_crtc_ddp_hw_init(struct
> mtk_drm_crtc *mtk_crtc, struct drm_atomic
>
> return 0;
>
> -err_mutex_unprepare:
> +error:
> mtk_mutex_unprepare(mtk_crtc->mutex);
> -err_pm_runtime_put:
> - pm_runtime_put(crtc->dev->dev);
> return ret;
> }
>
> static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *mtk_crtc)
> {
> - struct drm_device *drm = mtk_crtc->base.dev;
> struct drm_crtc *crtc = &mtk_crtc->base;
> int i;
>
> @@ -465,8 +455,6 @@ static void mtk_crtc_ddp_hw_fini(struct
> mtk_drm_crtc *mtk_crtc)
> mtk_crtc_ddp_clk_disable(mtk_crtc);
> mtk_mutex_unprepare(mtk_crtc->mutex);
>
> - pm_runtime_put(drm->dev);
> -
> if (crtc->state->event && !crtc->state->active) {
> spin_lock_irq(&crtc->dev->event_lock);
> drm_crtc_send_vblank_event(crtc, crtc->state->event);
