diff options
| author | Suresh Udipi <sudipi@jp.adit-jv.com> | 2021-08-13 18:07:54 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-27 13:03:19 +0300 |
| commit | 92cb150c3ec8b88819fecd43461aab55e2d16e91 (patch) | |
| tree | 870c7434a943092008e27085bb83752101d2b66a /drivers/media | |
| parent | 842a240666536c98f6a95012a35f4d69cb0fdfca (diff) | |
| download | linux-92cb150c3ec8b88819fecd43461aab55e2d16e91.tar.xz | |
media: rcar-csi2: Correct the selection of hsfreqrange
[ Upstream commit cee44d4fbacbbdfe62697ec94e76c6e4f726c5df ]
hsfreqrange should be chosen based on the calculated mbps which
is closer to the default bit rate and within the range as per
table[1]. But current calculation always selects first value which
is greater than or equal to the calculated mbps which may lead
to chosing a wrong range in some cases.
For example for 360 mbps for H3/M3N
Existing logic selects
Calculated value 360Mbps : Default 400Mbps Range [368.125 -433.125 mbps]
This hsfreqrange is out of range.
The logic is changed to get the default value which is closest to the
calculated value [1]
Calculated value 360Mbps : Default 350Mbps Range [320.625 -380.625 mpbs]
[1] specs r19uh0105ej0200-r-car-3rd-generation.pdf [Table 25.9]
Please note that According to Renesas in Table 25.9 the range for
220 default value is corrected as below
|Range (Mbps) | Default Bit rate (Mbps) |
-----------------------------------------------
| 197.125-244.125 | 220 |
-----------------------------------------------
Fixes: 769afd212b16 ("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: Kazuyoshi Akiyama <akiyama@nds-osk.co.jp>
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: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/platform/rcar-vin/rcar-csi2.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c index ba4a380016cc..3de782a90865 100644 --- a/drivers/media/platform/rcar-vin/rcar-csi2.c +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c @@ -445,16 +445,23 @@ static int rcsi2_wait_phy_start(struct rcar_csi2 *priv, static int rcsi2_set_phypll(struct rcar_csi2 *priv, unsigned int mbps) { const struct rcsi2_mbps_reg *hsfreq; + const struct rcsi2_mbps_reg *hsfreq_prev = NULL; - for (hsfreq = priv->info->hsfreqrange; hsfreq->mbps != 0; hsfreq++) + for (hsfreq = priv->info->hsfreqrange; hsfreq->mbps != 0; hsfreq++) { if (hsfreq->mbps >= mbps) break; + hsfreq_prev = hsfreq; + } if (!hsfreq->mbps) { dev_err(priv->dev, "Unsupported PHY speed (%u Mbps)", mbps); return -ERANGE; } + if (hsfreq_prev && + ((mbps - hsfreq_prev->mbps) <= (hsfreq->mbps - mbps))) + hsfreq = hsfreq_prev; + rcsi2_write(priv, PHYPLL_REG, PHYPLL_HSFREQRANGE(hsfreq->reg)); return 0; |