linux-kernel - [PATCH v3 2/2] drm/mediatek: dpi/dsi: fix possible

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Date:   Fri,  1 Sep 2023 19:45:57 +0200
From:   Michael Walle <mwalle@...nel.org>
To:     Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     "Nancy . Lin" <nancy.lin@...iatek.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Jitao Shi <jitao.shi@...iatek.com>,
        Stu Hsieh <stu.hsieh@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Michael Walle <mwalle@...nel.org>
Subject: [PATCH v3 2/2] drm/mediatek: dpi/dsi: fix possible_crtcs calculation

mtk_drm_find_possible_crtc_by_comp() assumed that the main path will
always have the CRTC with id 0, the ext id 1 and the third id 2. This
is only true if the paths are all available. But paths are optional (see
also comment in mtk_drm_kms_init()), e.g. the main path might not be
enabled or available at all. Then the CRTC IDs will shift one up, e.g.
ext will be 0 and the third path will be 1.

To fix that, dynamically calculate the IDs by the presence of the paths.

Fixes: 5aa8e7647676 ("drm/mediatek: dpi/dsi: Change the getting possible_crtc way")
Suggested-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Signed-off-by: Michael Walle <mwalle@...nel.org>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---
v3:
 - use data instead of priv_n->data
 - fixed typos
 - collected Rb and Tb tags
v2:
 - iterate over all_drm_private[] to get any vdosys
 - new check if a path is available
---
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 72 +++++++++++++++++----
 1 file changed, 58 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 771f4e173353..c00f4669cc50 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -507,6 +507,27 @@ static bool mtk_drm_find_comp_in_ddp(struct device *dev,
 	return false;
 }
 
+static bool mtk_ddp_path_available(const unsigned int *path,
+				   unsigned int path_len,
+				   struct device_node **comp_node)
+{
+	unsigned int i;
+
+	if (!path)
+		return false;
+
+	for (i = 0U; i < path_len; i++) {
+		/* OVL_ADAPTOR doesn't have a device node */
+		if (path[i] == DDP_COMPONENT_DRM_OVL_ADAPTOR)
+			continue;
+
+		if (!comp_node[path[i]])
+			return false;
+	}
+
+	return true;
+}
+
 int mtk_ddp_comp_get_id(struct device_node *node,
 			enum mtk_ddp_comp_type comp_type)
 {
@@ -526,21 +547,44 @@ unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device *drm,
 						struct device *dev)
 {
 	struct mtk_drm_private *private = drm->dev_private;
-	unsigned int ret = 0;
-
-	if (mtk_drm_find_comp_in_ddp(dev, private->data->main_path, private->data->main_len,
-				     private->ddp_comp))
-		ret = BIT(0);
-	else if (mtk_drm_find_comp_in_ddp(dev, private->data->ext_path,
-					  private->data->ext_len, private->ddp_comp))
-		ret = BIT(1);
-	else if (mtk_drm_find_comp_in_ddp(dev, private->data->third_path,
-					  private->data->third_len, private->ddp_comp))
-		ret = BIT(2);
-	else
-		DRM_INFO("Failed to find comp in ddp table\n");
+	const struct mtk_mmsys_driver_data *data;
+	struct mtk_drm_private *priv_n;
+	int i = 0, j;
+
+	for (j = 0; j < private->data->mmsys_dev_num; j++) {
+		priv_n = private->all_drm_private[j];
+		data = priv_n->data;
+
+		if (mtk_ddp_path_available(data->main_path, data->main_len,
+					   priv_n->comp_node)) {
+			if (mtk_drm_find_comp_in_ddp(dev, data->main_path,
+						     data->main_len,
+						     priv_n->ddp_comp))
+				return BIT(i);
+			i++;
+		}
+
+		if (mtk_ddp_path_available(data->ext_path, data->ext_len,
+					   priv_n->comp_node)) {
+			if (mtk_drm_find_comp_in_ddp(dev, data->ext_path,
+						     data->ext_len,
+						     priv_n->ddp_comp))
+				return BIT(i);
+			i++;
+		}
+
+		if (mtk_ddp_path_available(data->third_path, data->third_len,
+					   priv_n->comp_node)) {
+			if (mtk_drm_find_comp_in_ddp(dev, data->third_path,
+						     data->third_len,
+						     priv_n->ddp_comp))
+				return BIT(i);
+			i++;
+		}
+	}
 
-	return ret;
+	DRM_INFO("Failed to find comp in ddp table\n");
+	return 0;
 }
 
 int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp,
-- 
2.39.2