From: <yongqiang.niu@mediatek.com>
To: CK Hu <ck.hu@mediatek.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
"Rob Herring" <robh+dt@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org,
Yongqiang Niu <yongqiang.niu@mediatek.com>,
David Airlie <airlied@linux.ie>,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-mediatek@lists.infradead.org,
Daniel Vetter <daniel@ffwll.ch>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v1] drm/mediatek: fix up 1440x900 dp display black screen issue
Date: Tue, 26 Nov 2019 14:47:49 +0800 [thread overview]
Message-ID: <1574750869-12611-1-git-send-email-yongqiang.niu@mediatek.com> (raw)
From: Yongqiang Niu <yongqiang.niu@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.niu@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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next reply other threads:[~2019-11-26 6:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-26 6:47 yongqiang.niu [this message]
2019-11-27 1:31 ` [PATCH v1] drm/mediatek: fix up 1440x900 dp display black screen issue CK Hu
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