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* [PATCH v2] drm/mediatek: adjust rdma fifo threshold calculate formula
@ 2021-06-24 13:02 ` Yongqiang Niu
  0 siblings, 0 replies; 8+ messages in thread
From: Yongqiang Niu @ 2021-06-24 13:02 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: Rob Herring, Matthias Brugger, Philipp Zabel, David Airlie,
	Daniel Vetter, Jassi Brar, Yongqiang Niu, Fabien Parent,
	Dennis YC Hsieh, devicetree, linux-arm-kernel, linux-mediatek,
	linux-kernel, dri-devel, Project_Global_Chrome_Upstream_Group,
	Hsin-Yi Wang

base linux 5.13-rc1

Yongqiang Niu (1):
  drm/mediatek: adjust rdma fifo threshold calculate formula

 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
1.8.1.1.dirty


^ permalink raw reply	[flat|nested] 8+ messages in thread
* [PATCH v2] drm/mediatek: adjust rdma fifo threshold calculate formula
@ 2021-06-24 13:02 ` Yongqiang Niu
  0 siblings, 0 replies; 8+ messages in thread
From: Yongqiang Niu @ 2021-06-24 13:02 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: Rob Herring, Matthias Brugger, Philipp Zabel, David Airlie,
	Daniel Vetter, Jassi Brar, Yongqiang Niu, Fabien Parent,
	Dennis YC Hsieh, devicetree, linux-arm-kernel, linux-mediatek,
	linux-kernel, dri-devel, Project_Global_Chrome_Upstream_Group,
	Hsin-Yi Wang

base linux 5.13-rc1

Yongqiang Niu (1):
  drm/mediatek: adjust rdma fifo threshold calculate formula

 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
1.8.1.1.dirty
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

^ permalink raw reply	[flat|nested] 8+ messages in thread
* [PATCH v2] drm/mediatek: adjust rdma fifo threshold calculate formula
@ 2021-06-24 13:02 ` Yongqiang Niu
  0 siblings, 0 replies; 8+ messages in thread
From: Yongqiang Niu @ 2021-06-24 13:02 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: Rob Herring, Matthias Brugger, Philipp Zabel, David Airlie,
	Daniel Vetter, Jassi Brar, Yongqiang Niu, Fabien Parent,
	Dennis YC Hsieh, devicetree, linux-arm-kernel, linux-mediatek,
	linux-kernel, dri-devel, Project_Global_Chrome_Upstream_Group,
	Hsin-Yi Wang

base linux 5.13-rc1

Yongqiang Niu (1):
  drm/mediatek: adjust rdma fifo threshold calculate formula

 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
1.8.1.1.dirty
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 8+ messages in thread
* [PATCH v2] drm/mediatek: adjust rdma fifo threshold calculate formula
@ 2021-06-24 13:02 ` Yongqiang Niu
  0 siblings, 0 replies; 8+ messages in thread
From: Yongqiang Niu @ 2021-06-24 13:02 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: devicetree, Project_Global_Chrome_Upstream_Group, David Airlie,
	Jassi Brar, linux-kernel, dri-devel, Yongqiang Niu,
	Dennis YC Hsieh, Fabien Parent, Rob Herring, linux-mediatek,
	Hsin-Yi Wang, Matthias Brugger, linux-arm-kernel

base linux 5.13-rc1

Yongqiang Niu (1):
  drm/mediatek: adjust rdma fifo threshold calculate formula

 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
1.8.1.1.dirty


^ permalink raw reply	[flat|nested] 8+ messages in thread
* [PATCH v2] drm/mediatek: adjust rdma fifo threshold calculate formula
  2021-06-24 13:02 ` Yongqiang Niu
  (?)
  (?)
@ 2021-06-24 13:02   ` Yongqiang Niu
  -1 siblings, 0 replies; 8+ messages in thread
From: Yongqiang Niu @ 2021-06-24 13:02 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: Rob Herring, Matthias Brugger, Philipp Zabel, David Airlie,
	Daniel Vetter, Jassi Brar, Yongqiang Niu, Fabien Parent,
	Dennis YC Hsieh, devicetree, linux-arm-kernel, linux-mediatek,
	linux-kernel, dri-devel, Project_Global_Chrome_Upstream_Group,
	Hsin-Yi Wang

the orginal formula will caused rdma fifo threshold config overflow

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
index 728aaad..bef3f04 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -164,10 +164,10 @@ void mtk_rdma_config(struct device *dev, unsigned int width,
 	/*
 	 * Enable FIFO underflow since DSI and DPI can't be blocked.
 	 * Keep the FIFO pseudo size reset default of 8 KiB. Set the
-	 * output threshold to 6 microseconds with 7/6 overhead to
-	 * account for blanking, and with a pixel depth of 4 bytes:
+	 * output threshold to 70% of max fifo size to make sure the
+	 * threhold will not overflow
 	 */
-	threshold = width * height * vrefresh * 4 * 7 / 1000000;
+	threshold = rdma_fifo_size * 7 / 10;
 	reg = RDMA_FIFO_UNDERFLOW_EN |
 	      RDMA_FIFO_PSEUDO_SIZE(rdma_fifo_size) |
 	      RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
-- 
1.8.1.1.dirty


^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH v2] drm/mediatek: adjust rdma fifo threshold calculate formula
@ 2021-06-24 13:02   ` Yongqiang Niu
  0 siblings, 0 replies; 8+ messages in thread
From: Yongqiang Niu @ 2021-06-24 13:02 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: Rob Herring, Matthias Brugger, Philipp Zabel, David Airlie,
	Daniel Vetter, Jassi Brar, Yongqiang Niu, Fabien Parent,
	Dennis YC Hsieh, devicetree, linux-arm-kernel, linux-mediatek,
	linux-kernel, dri-devel, Project_Global_Chrome_Upstream_Group,
	Hsin-Yi Wang

the orginal formula will caused rdma fifo threshold config overflow

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
index 728aaad..bef3f04 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -164,10 +164,10 @@ void mtk_rdma_config(struct device *dev, unsigned int width,
 	/*
 	 * Enable FIFO underflow since DSI and DPI can't be blocked.
 	 * Keep the FIFO pseudo size reset default of 8 KiB. Set the
-	 * output threshold to 6 microseconds with 7/6 overhead to
-	 * account for blanking, and with a pixel depth of 4 bytes:
+	 * output threshold to 70% of max fifo size to make sure the
+	 * threhold will not overflow
 	 */
-	threshold = width * height * vrefresh * 4 * 7 / 1000000;
+	threshold = rdma_fifo_size * 7 / 10;
 	reg = RDMA_FIFO_UNDERFLOW_EN |
 	      RDMA_FIFO_PSEUDO_SIZE(rdma_fifo_size) |
 	      RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
-- 
1.8.1.1.dirty
_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH v2] drm/mediatek: adjust rdma fifo threshold calculate formula
@ 2021-06-24 13:02   ` Yongqiang Niu
  0 siblings, 0 replies; 8+ messages in thread
From: Yongqiang Niu @ 2021-06-24 13:02 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: Rob Herring, Matthias Brugger, Philipp Zabel, David Airlie,
	Daniel Vetter, Jassi Brar, Yongqiang Niu, Fabien Parent,
	Dennis YC Hsieh, devicetree, linux-arm-kernel, linux-mediatek,
	linux-kernel, dri-devel, Project_Global_Chrome_Upstream_Group,
	Hsin-Yi Wang

the orginal formula will caused rdma fifo threshold config overflow

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
index 728aaad..bef3f04 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -164,10 +164,10 @@ void mtk_rdma_config(struct device *dev, unsigned int width,
 	/*
 	 * Enable FIFO underflow since DSI and DPI can't be blocked.
 	 * Keep the FIFO pseudo size reset default of 8 KiB. Set the
-	 * output threshold to 6 microseconds with 7/6 overhead to
-	 * account for blanking, and with a pixel depth of 4 bytes:
+	 * output threshold to 70% of max fifo size to make sure the
+	 * threhold will not overflow
 	 */
-	threshold = width * height * vrefresh * 4 * 7 / 1000000;
+	threshold = rdma_fifo_size * 7 / 10;
 	reg = RDMA_FIFO_UNDERFLOW_EN |
 	      RDMA_FIFO_PSEUDO_SIZE(rdma_fifo_size) |
 	      RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
-- 
1.8.1.1.dirty
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 8+ messages in thread
* [PATCH v2] drm/mediatek: adjust rdma fifo threshold calculate formula
@ 2021-06-24 13:02   ` Yongqiang Niu
  0 siblings, 0 replies; 8+ messages in thread
From: Yongqiang Niu @ 2021-06-24 13:02 UTC (permalink / raw)
  To: Chun-Kuang Hu
  Cc: devicetree, Project_Global_Chrome_Upstream_Group, David Airlie,
	Jassi Brar, linux-kernel, dri-devel, Yongqiang Niu,
	Dennis YC Hsieh, Fabien Parent, Rob Herring, linux-mediatek,
	Hsin-Yi Wang, Matthias Brugger, linux-arm-kernel

the orginal formula will caused rdma fifo threshold config overflow

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
index 728aaad..bef3f04 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -164,10 +164,10 @@ void mtk_rdma_config(struct device *dev, unsigned int width,
 	/*
 	 * Enable FIFO underflow since DSI and DPI can't be blocked.
 	 * Keep the FIFO pseudo size reset default of 8 KiB. Set the
-	 * output threshold to 6 microseconds with 7/6 overhead to
-	 * account for blanking, and with a pixel depth of 4 bytes:
+	 * output threshold to 70% of max fifo size to make sure the
+	 * threhold will not overflow
 	 */
-	threshold = width * height * vrefresh * 4 * 7 / 1000000;
+	threshold = rdma_fifo_size * 7 / 10;
 	reg = RDMA_FIFO_UNDERFLOW_EN |
 	      RDMA_FIFO_PSEUDO_SIZE(rdma_fifo_size) |
 	      RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
-- 
1.8.1.1.dirty


^ permalink raw reply related	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2021-06-24 13:14 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-24 13:02 [PATCH v2] drm/mediatek: adjust rdma fifo threshold calculate formula Yongqiang Niu
2021-06-24 13:02 ` Yongqiang Niu
2021-06-24 13:02 ` Yongqiang Niu
2021-06-24 13:02 ` Yongqiang Niu
2021-06-24 13:02 ` Yongqiang Niu
2021-06-24 13:02   ` Yongqiang Niu
2021-06-24 13:02   ` Yongqiang Niu
2021-06-24 13:02   ` Yongqiang Niu

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