Re: [PATCH v1 6/6] drm/mediatek: apply CMDQ control flow

Hi, Bibby:

On Thu, 2019-11-28 at 10:42 +0800, Bibby Hsieh wrote:

Unlike other SoCs, MT8183 does not have "shadow" registers for performaing an atomic video mode set or page flip at vblank/vsync.

The CMDQ (Commend Queue) in MT8183 is used to help update all relevant display controller registers with critical time limation.

Signed-off-by: YT Shen yt.shen@mediatek.com Signed-off-by: CK Hu ck.hu@mediatek.com Signed-off-by: Philipp Zabel p.zabel@pengutronix.de Signed-off-by: Bibby Hsieh bibby.hsieh@mediatek.com Signed-off-by: Yongqiang Niu yongqiang.niu@mediatek.com

---

drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 86 ++++++++++++++++++++- drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 31 ++++++++ 2 files changed, 113 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index fcf4e755e0bd..1b4e537ac3c1 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -12,6 +12,8 @@ #include <drm/drm_plane_helper.h> #include <drm/drm_probe_helper.h> #include <drm/drm_vblank.h> +#include <linux/of_address.h> +#include <linux/soc/mediatek/mtk-cmdq.h>

#include "mtk_drm_drv.h" #include "mtk_drm_crtc.h" @@ -42,6 +44,9 @@ struct mtk_drm_crtc { unsigned int layer_nr; bool pending_planes;

• struct cmdq_client *cmdq_client;
• u32 cmdq_event;
• void __iomem *config_regs; const struct mtk_mmsys_reg_data *mmsys_reg_data; struct mtk_disp_mutex *mutex;

@@ -56,6 +61,11 @@ struct mtk_crtc_state { unsigned int pending_width; unsigned int pending_height; unsigned int pending_vrefresh;

• struct cmdq_pkt *cmdq_handle;

+};

+struct mtk_cmdq_cb_data {

• struct cmdq_pkt *cmdq_handle;

};

static inline struct mtk_drm_crtc *to_mtk_crtc(struct drm_crtc *c) @@ -229,6 +239,46 @@ struct mtk_ddp_comp *mtk_drm_ddp_comp_for_plane(struct drm_crtc *crtc, return NULL; }

+#ifdef CONFIG_MTK_CMDQ +static void ddp_cmdq_cb(struct cmdq_cb_data data) +{

• struct mtk_cmdq_cb_data *cb_data = data.data;
• cmdq_pkt_destroy(cb_data->cmdq_handle);
• kfree(cb_data);

+}

+static void mtk_cmdq_acquire(struct drm_crtc *crtc) +{

• struct mtk_crtc_state *mtk_crtc_state =

• 	to_mtk_crtc_state(crtc->state);
  

• struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
• mtk_crtc_state->cmdq_handle =

• 	cmdq_pkt_create(mtk_crtc->cmdq_client,
  

• 			PAGE_SIZE);
  

I would like to remove atomic feature in cmdq driver and drm driver could reuse the pkt. Please refer to [1] for detail.

[1] http://lists.infradead.org/pipermail/linux-mediatek/2019-January/016866.html

• cmdq_pkt_clear_event(mtk_crtc_state->cmdq_handle,

• 	     mtk_crtc->cmdq_event);
  

• cmdq_pkt_wfe(mtk_crtc_state->cmdq_handle, mtk_crtc->cmdq_event);

+}

+static void mtk_cmdq_release(struct drm_crtc *crtc) +{

• struct mtk_crtc_state *mtk_crtc_state =

• 	to_mtk_crtc_state(crtc->state);
  

• struct mtk_cmdq_cb_data *cb_data;
• cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL);
• if (!cb_data) {

• DRM_DEV_ERROR(crtc->dev->dev, "Failed to alloc cb_data\n");
  

• return;
  

• }
• cb_data->cmdq_handle = mtk_crtc_state->cmdq_handle;
• cmdq_pkt_flush_async(mtk_crtc_state->cmdq_handle,

• 	     ddp_cmdq_cb, cb_data);
  

+} +#endif static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc) { struct drm_crtc *crtc = &mtk_crtc->base; @@ -383,7 +433,8 @@ 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,
  

• 		    state->cmdq_handle);
  
  

  state->pending_config = false; }

@@ -403,7 +454,8 @@ 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,
  

• 					  state->cmdq_handle);
  plane_state->pending.config = false;
  

  } mtk_crtc->pending_planes = false;

@@ -454,6 +506,13 @@ void mtk_drm_crtc_cursor_update(struct drm_crtc *crtc, struct drm_plane *plane, mtk_crtc_ddp_config(crtc); mtk_disp_mutex_release(mtk_crtc->mutex); } +#ifdef CONFIG_MTK_CMDQ

• if (mtk_crtc->cmdq_client) {

• mtk_cmdq_acquire(crtc);
  

• mtk_crtc_ddp_config(crtc);
  

• mtk_cmdq_release(crtc);
  

• }

+#endif mutex_unlock(&priv->hw_lock); }

@@ -570,6 +629,13 @@ static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc, mtk_crtc_ddp_config(crtc); mtk_disp_mutex_release(mtk_crtc->mutex); } +#ifdef CONFIG_MTK_CMDQ

• if (mtk_crtc->cmdq_client) {

• mtk_cmdq_acquire(crtc);
  

• mtk_crtc_ddp_config(crtc);
  

• mtk_cmdq_release(crtc);
  

• }

+#endif

This part is almost the same as the one in mtk_drm_crtc_cursor_update(), try to merge them.

}

static const struct drm_crtc_funcs mtk_crtc_funcs = { @@ -619,7 +685,7 @@ 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 (!priv->data->shadow_register)

• if (!priv->data->shadow_register && !mtk_crtc->cmdq_client) mtk_crtc_ddp_config(crtc);

  mtk_drm_finish_page_flip(mtk_crtc);

@@ -761,6 +827,18 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev, 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++;

+#ifdef CONFIG_MTK_CMDQ

• mtk_crtc->cmdq_client =

• 	cmdq_mbox_create(dev, drm_crtc_index(&mtk_crtc->base),
  

• 			 2000);
  

• of_property_read_u32_index(dev->of_node, "mediatek,gce-events",

• 		   drm_crtc_index(&mtk_crtc->base),
  

• 		   &mtk_crtc->cmdq_event);
  

• 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;
  

• }

+#endif return 0; } diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c index 6d0f349ddf82..9cc12af2bc06 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c @@ -370,6 +370,9 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node, const struct mtk_ddp_comp_funcs *funcs) { struct platform_device *comp_pdev;

• struct resource res;

• struct cmdq_client_reg *cmdq_reg;

• int ret = 0;

  if (comp_id < 0 || comp_id >= DDP_COMPONENT_ID_MAX) return -EINVAL;

@@ -404,6 +407,34 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node, } comp->dev = &comp_pdev->dev;

+#ifdef CONFIG_MTK_CMDQ

• if (of_address_to_resource(node, 0, &res) != 0) {

• dev_err(dev, "Missing reg in %s node\n",
  

• 	node->full_name);
  

• return -EINVAL;
  

• }
• comp->regs_pa = res.start;
• comp_pdev = of_find_device_by_node(node);
• if (!comp_pdev) {

• dev_warn(dev, "Waiting for component device %s\n",
  

• 	 node->full_name);
  

• return -EPROBE_DEFER;
  

• }
• cmdq_reg = kzalloc(sizeof(*cmdq_reg), GFP_KERNEL);
• if (!cmdq_reg)

• return -EINVAL;
  

• ret = cmdq_dev_get_client_reg(&comp_pdev->dev, cmdq_reg, 0);
• if (ret != 0)

• dev_dbg(&comp_pdev->dev,
  

• 	"get mediatek,gce-client-reg fail!\n");
  

• else

• comp->subsys = cmdq_reg->subsys;
  

• kfree(cmdq_reg);

+#endif

I would like to move this part to the patch "drm/mediatek: support CMDQ interface in ddp component".

Regards, CK

return 0; }