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drm/mediatek: dsi: Add mode_valid callback to DSI bridge

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Support IGT (Intel GPU Tools) in Mediatek DSI driver.
According to the description of MIPI Alliance Specification for D-PHY
Version 1.1, the maximum supported data rate is 1.5Gbps, so add mode_valid
callback to dsi bridge to filter out the data rate exceeding the
Specification.

Signed-off-by: Shuijing Li <shuijing.li@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20230823092047.32258-1-shuijing.li@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
This commit is contained in:
Shuijing Li
2023-08-23 17:20:47 +08:00
committed by Chun-Kuang Hu
parent fcaf9761fd
commit 609252ea46
1 changed files with 20 additions and 0 deletions
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20
drivers/gpu/drm/mediatek/mtk_dsi.c
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@@ -808,6 +808,25 @@ 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,
@@ -817,6 +836,7 @@ 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,
};