This is a note to let you know that I've just added the patch titled
media: rcar-csi2: Optimize the selection PHTW register
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-rcar-csi2-optimize-the-selection-phtw-register.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 549cc89cd09a85aaa16dc07ef3db811d5cf9bcb1 Mon Sep 17 00:00:00 2001
From: Suresh Udipi <sudipi@xxxxxxxxxxxxxx>
Date: Fri, 13 Aug 2021 17:07:56 +0200
Subject: media: rcar-csi2: Optimize the selection PHTW register
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From: Suresh Udipi <sudipi@xxxxxxxxxxxxxx>
commit 549cc89cd09a85aaa16dc07ef3db811d5cf9bcb1 upstream.
PHTW register is selected based on default bit rate from Table[1].
for the bit rates less than or equal to 250. Currently first
value of default bit rate which is greater than or equal to
the caculated mbps is selected. This selection can be further
improved by selecting the default bit rate which is nearest to
the calculated value.
[1] specs r19uh0105ej0200-r-car-3rd-generation.pdf [Table 25.12]
Fixes: 769afd212b16 ("media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver driver")
Signed-off-by: Suresh Udipi <sudipi@xxxxxxxxxxxxxx>
Signed-off-by: Michael Rodin <mrodin@xxxxxxxxxxxxxx>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/platform/rcar-vin/rcar-csi2.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -989,10 +989,17 @@ static int rcsi2_phtw_write_mbps(struct
const struct rcsi2_mbps_reg *values, u16 code)
{
const struct rcsi2_mbps_reg *value;
+ const struct rcsi2_mbps_reg *prev_value = NULL;
- for (value = values; value->mbps; value++)
+ for (value = values; value->mbps; value++) {
if (value->mbps >= mbps)
break;
+ prev_value = value;
+ }
+
+ if (prev_value &&
+ ((mbps - prev_value->mbps) <= (value->mbps - mbps)))
+ value = prev_value;
if (!value->mbps) {
dev_err(priv->dev, "Unsupported PHY speed (%u Mbps)", mbps);
Patches currently in stable-queue which might be from sudipi@xxxxxxxxxxxxxx are
queue-5.15/media-rcar-csi2-optimize-the-selection-phtw-register.patch
queue-5.15/media-rcar-csi2-correct-the-selection-of-hsfreqrange.patch
