From 2f965be7f90083f7cfd57c49f74a7f341de335a9 Mon Sep 17 00:00:00 2001 From: Bibby Hsieh Date: Tue, 10 Dec 2019 13:05:26 +0800 Subject: [PATCH] drm/mediatek: apply CMDQ control flow In some Mediatek SoC, there is no "shadow" registers for performaing an atomic video mode set or page flip at vblank/vsync. The CMDQ (Commend Queue) is used to help update all relevant display controller registers with critical time limation. Signed-off-by: YT Shen Signed-off-by: Philipp Zabel Signed-off-by: Bibby Hsieh Signed-off-by: Yongqiang Niu Signed-off-by: CK Hu --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 61 ++++++++++++++++++++++--- 1 file changed, 55 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index 87cba4612231..baa66d1a2cf6 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -5,6 +5,7 @@ #include #include +#include #include #include @@ -44,6 +45,11 @@ struct mtk_drm_crtc { bool pending_planes; bool pending_async_planes; +#if IS_REACHABLE(CONFIG_MTK_CMDQ) + struct cmdq_client *cmdq_client; + u32 cmdq_event; +#endif + void __iomem *config_regs; struct mtk_disp_mutex *mutex; unsigned int ddp_comp_nr; @@ -234,6 +240,13 @@ struct mtk_ddp_comp *mtk_drm_ddp_comp_for_plane(struct drm_crtc *crtc, return NULL; } +#if IS_REACHABLE(CONFIG_MTK_CMDQ) +static void ddp_cmdq_cb(struct cmdq_cb_data data) +{ + cmdq_pkt_destroy(data.data); +} +#endif + static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc) { struct drm_crtc *crtc = &mtk_crtc->base; @@ -367,7 +380,8 @@ static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *mtk_crtc) } } -static void mtk_crtc_ddp_config(struct drm_crtc *crtc) +static void mtk_crtc_ddp_config(struct drm_crtc *crtc, + struct cmdq_pkt *cmdq_handle) { struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); struct mtk_crtc_state *state = to_mtk_crtc_state(mtk_crtc->base.state); @@ -383,7 +397,8 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc) if (state->pending_config) { mtk_ddp_comp_config(comp, state->pending_width, state->pending_height, - state->pending_vrefresh, 0, NULL); + state->pending_vrefresh, 0, + cmdq_handle); state->pending_config = false; } @@ -403,7 +418,8 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc) if (comp) mtk_ddp_comp_layer_config(comp, local_layer, - plane_state, NULL); + plane_state, + cmdq_handle); plane_state->pending.config = false; } mtk_crtc->pending_planes = false; @@ -424,7 +440,8 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc) if (comp) mtk_ddp_comp_layer_config(comp, local_layer, - plane_state, NULL); + plane_state, + cmdq_handle); plane_state->pending.async_config = false; } mtk_crtc->pending_async_planes = false; @@ -433,6 +450,9 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc) static void mtk_drm_crtc_hw_config(struct mtk_drm_crtc *mtk_crtc) { +#if IS_REACHABLE(CONFIG_MTK_CMDQ) + struct cmdq_pkt *cmdq_handle; +#endif struct drm_crtc *crtc = &mtk_crtc->base; struct mtk_drm_private *priv = crtc->dev->dev_private; unsigned int pending_planes = 0, pending_async_planes = 0; @@ -461,9 +481,18 @@ static void mtk_drm_crtc_hw_config(struct mtk_drm_crtc *mtk_crtc) if (priv->data->shadow_register) { mtk_disp_mutex_acquire(mtk_crtc->mutex); - mtk_crtc_ddp_config(crtc); + mtk_crtc_ddp_config(crtc, NULL); mtk_disp_mutex_release(mtk_crtc->mutex); } +#if IS_REACHABLE(CONFIG_MTK_CMDQ) + if (mtk_crtc->cmdq_client) { + cmdq_handle = cmdq_pkt_create(mtk_crtc->cmdq_client, PAGE_SIZE); + cmdq_pkt_clear_event(cmdq_handle, mtk_crtc->cmdq_event); + cmdq_pkt_wfe(cmdq_handle, mtk_crtc->cmdq_event); + mtk_crtc_ddp_config(crtc, cmdq_handle); + cmdq_pkt_flush_async(cmdq_handle, ddp_cmdq_cb, cmdq_handle); + } +#endif mutex_unlock(&mtk_crtc->hw_lock); } @@ -629,8 +658,12 @@ void mtk_crtc_ddp_irq(struct drm_crtc *crtc, struct mtk_ddp_comp *comp) struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc); struct mtk_drm_private *priv = crtc->dev->dev_private; +#if IS_REACHABLE(CONFIG_MTK_CMDQ) + if (!priv->data->shadow_register && !mtk_crtc->cmdq_client) +#else if (!priv->data->shadow_register) - mtk_crtc_ddp_config(crtc); +#endif + mtk_crtc_ddp_config(crtc, NULL); mtk_drm_finish_page_flip(mtk_crtc); } @@ -772,5 +805,21 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev, priv->num_pipes++; mutex_init(&mtk_crtc->hw_lock); +#if IS_REACHABLE(CONFIG_MTK_CMDQ) + mtk_crtc->cmdq_client = + cmdq_mbox_create(dev, drm_crtc_index(&mtk_crtc->base), + 2000); + if (IS_ERR(mtk_crtc->cmdq_client)) { + dev_dbg(dev, "mtk_crtc %d failed to create mailbox client, writing register by CPU now\n", + drm_crtc_index(&mtk_crtc->base)); + mtk_crtc->cmdq_client = NULL; + } + ret = of_property_read_u32_index(dev->of_node, "mediatek,gce-events", + drm_crtc_index(&mtk_crtc->base), + &mtk_crtc->cmdq_event); + if (ret) + dev_dbg(dev, "mtk_crtc %d failed to get mediatek,gce-events property\n", + drm_crtc_index(&mtk_crtc->base)); +#endif return 0; }