From: Yoshifumi Hosoya <yoshifumi.hosoya.wj@xxxxxxxxxxx>
Change to VSPD hardware recommended value.
Purpose is highest pixel clock without underruns.
In the default R-Car Linux BSP config this value is
wrong and therefore there are many underruns.
Here are the original settings:
HBTH = 1300 (VSPD stops when 1300 pixels are buffered)
LBTH = 200 (VSPD resumes when buffer level has decreased
below 200 pixels)
The display underruns can be eliminated
by applying the following settings:
HBTH = 1504
LBTH = 1248
Reported-by: Peter Fiedler <peter.fiedler@xxxxxxxxxxx>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@xxxxxxxxxxx>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@xxxxxxxxx>
---
This patch is based on the master branch of linuxtv.org/media_tree.git.
drivers/media/platform/vsp1/vsp1_lif.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/media/platform/vsp1/vsp1_lif.c b/drivers/media/platform/vsp1/vsp1_lif.c
index 17a6ca7..7d0f7eb 100644
--- a/drivers/media/platform/vsp1/vsp1_lif.c
+++ b/drivers/media/platform/vsp1/vsp1_lif.c
@@ -1,7 +1,7 @@
/*
* vsp1_lif.c -- R-Car VSP1 LCD Controller Interface
*
- * Copyright (C) 2013-2014 Renesas Electronics Corporation
+ * Copyright (C) 2013-2015 Renesas Electronics Corporation
*
* Contact: Laurent Pinchart (laurent.pinchart@xxxxxxxxxxxxxxxx)
*
@@ -44,9 +44,9 @@ static int lif_s_stream(struct v4l2_subdev *subdev, int enable)
{
const struct v4l2_mbus_framefmt *format;
struct vsp1_lif *lif = to_lif(subdev);
- unsigned int hbth = 1300;
- unsigned int obth = 400;
- unsigned int lbth = 200;
+ unsigned int hbth = 1536;
+ unsigned int obth = 128;
+ unsigned int lbth = 1520;
if (!enable) {
vsp1_lif_write(lif, VI6_LIF_CTRL, 0);
--
1.9.1
--
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