[PATCH v3 3/5] drm/mediatek: Detect CMDQ execution timeout
From: jason-jh.lin <hidden>
Date: 2021-10-25 16:16:02
Also in:
dri-devel, linux-mediatek
Subsystem:
drm drivers, drm drivers for mediatek, the rest · Maintainers:
David Airlie, Simona Vetter, Chun-Kuang Hu, Philipp Zabel, Linus Torvalds
From: Chun-Kuang Hu <chunkuang.hu@kernel.org> CMDQ is used to update display register in vblank period, so it should be execute in next vblank. If it fail to execute in next 2 vblank, tiemout happen. Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org> Signed-off-by: jason-jh.lin <redacted> --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index e23e3224ac67..d992f34632e3 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c@@ -54,6 +54,7 @@ struct mtk_drm_crtc { #if IS_REACHABLE(CONFIG_MTK_CMDQ) struct cmdq_client cmdq_client; u32 cmdq_event; + u32 cmdq_vblank_cnt; #endif struct device *mmsys_dev;
@@ -227,7 +228,10 @@ struct mtk_ddp_comp *mtk_drm_ddp_comp_for_plane(struct drm_crtc *crtc, static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg) { struct cmdq_cb_data *data = mssg; + struct cmdq_client *cmdq_cl = container_of(cl, struct cmdq_client, client); + struct mtk_drm_crtc *mtk_crtc = container_of(cmdq_cl, struct mtk_drm_crtc, cmdq_client); + mtk_crtc->cmdq_vblank_cnt = 0; cmdq_pkt_destroy(data->pkt); } #endif
@@ -483,6 +487,12 @@ static void mtk_drm_crtc_update_config(struct mtk_drm_crtc *mtk_crtc, cmdq_handle->pa_base, cmdq_handle->cmd_buf_size, DMA_TO_DEVICE); + /* + * CMDQ command should execute in next vblank, + * If it fail to execute in next 2 vblank, timeout happen. + */ + mtk_crtc->cmdq_vblank_cnt = 2; + mbox_send_message(mtk_crtc->cmdq_client.chan, cmdq_handle); mbox_client_txdone(mtk_crtc->cmdq_client.chan, 0); }
@@ -499,11 +509,14 @@ static void mtk_crtc_ddp_irq(void *data) #if IS_REACHABLE(CONFIG_MTK_CMDQ) if (!priv->data->shadow_register && !mtk_crtc->cmdq_client.chan) + mtk_crtc_ddp_config(crtc, NULL); + else if (mtk_crtc->cmdq_vblank_cnt > 0 && --mtk_crtc->cmdq_vblank_cnt == 0) + DRM_ERROR("mtk_crtc %d CMDQ execute command timeout!\n", + drm_crtc_index(&mtk_crtc->base)); #else if (!priv->data->shadow_register) -#endif mtk_crtc_ddp_config(crtc, NULL); - +#endif mtk_drm_finish_page_flip(mtk_crtc); }
--
2.18.0
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