From: Yongqiang Niu <yongqiang....@mediatek.com>
This patch fix up 1440x900 dp display black screen issue
the computed result will overflow rdma1 fifo max size
when external display pixel clock bigger than 74MHZ
Signed-off-by: Yongqiang Niu <yongqiang....@mediatek.com>
---
drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
index c1abde3..41143f5 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -152,6 +152,10 @@ static void mtk_rdma_config(struct mtk_ddp_comp *comp,
unsigned int width,
* account for blanking, and with a pixel depth of 4 bytes:
*/
threshold = width * height * vrefresh * 4 * 7 / 1000000;
+
+ if (threshold > rdma_fifo_size)
+ threshold = rdma_fifo_size;
+
reg = RDMA_FIFO_UNDERFLOW_EN |
RDMA_FIFO_PSEUDO_SIZE(rdma_fifo_size) |
RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
--
1.8.1.1.dirty
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