linux-kernel - [PATCH] drm/mediatek: Support IGT in dp driver

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Date:   Wed, 23 Aug 2023 16:25:49 +0800
From:   Shuijing Li <shuijing.li@...iatek.com>
To:     <chunkuang.hu@...nel.org>, <p.zabel@...gutronix.de>,
        <airlied@...il.com>, <daniel@...ll.ch>, <matthias.bgg@...il.com>,
        <angelogioacchino.delregno@...labora.com>
CC:     <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <jitao.shi@...iatek.com>, Shuijing Li <shuijing.li@...iatek.com>
Subject: [PATCH] drm/mediatek: Support IGT in dp driver

Support IGT (Intel GPU Tools) in Mediatek DisplayPort driver

Signed-off-by: Shuijing Li <shuijing.li@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 7d5250351193..a494e04f0ddf 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -806,6 +806,25 @@ static void mtk_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,
 	mtk_dsi_poweroff(dsi);
 }
 
+static enum drm_mode_status
+mtk_dsi_bridge_mode_valid(struct drm_bridge *bridge,
+			  const struct drm_display_info *info,
+			  const struct drm_display_mode *mode)
+{
+	struct mtk_dsi *dsi = bridge_to_dsi(bridge);
+	u32 bpp;
+
+	if (dsi->format == MIPI_DSI_FMT_RGB565)
+		bpp = 16;
+	else
+		bpp = 24;
+
+	if (mode->clock * bpp / dsi->lanes > 1500000)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
 static const struct drm_bridge_funcs mtk_dsi_bridge_funcs = {
 	.attach = mtk_dsi_bridge_attach,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
@@ -815,6 +834,7 @@ static const struct drm_bridge_funcs mtk_dsi_bridge_funcs = {
 	.atomic_pre_enable = mtk_dsi_bridge_atomic_pre_enable,
 	.atomic_post_disable = mtk_dsi_bridge_atomic_post_disable,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.mode_valid = mtk_dsi_bridge_mode_valid,
 	.mode_set = mtk_dsi_bridge_mode_set,
 };
 
-- 
2.40.1