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media: rcar-csi2: Optimize the selection PHTW register 

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>
This commit is contained in:
Suresh Udipi 2021-08-13 17:07:56 +02:00 committed by Mauro Carvalho Chehab
parent ebeefe2685
commit 549cc89cd0
1 changed files with 8 additions and 1 deletions
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9
drivers/media/platform/rcar-vin/rcar-csi2.c
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@ -1108,10 +1108,17 @@ 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);