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media: rcar-csi2: Optimize the selection PHTW register 

commit 549cc89cd0 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: 769afd212b ("media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver driver")
Signed-off-by: Suresh Udipi <sudipi@jp.adit-jv.com>
Signed-off-by: Michael Rodin <mrodin@de.adit-jv.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suresh Udipi 2021-08-13 17:07:56 +02:00 committed by Greg Kroah-Hartman
parent 547ea2d23e
commit 05594394dc
1 changed files with 8 additions and 1 deletions
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9
drivers/media/platform/rcar-vin/rcar-csi2.c
View File

@ -911,10 +911,17 @@ static int rcsi2_phtw_write_mbps(struct rcar_csi2 *priv, unsigned int mbps,
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);