linux-kernel - [PATCH v0 13/13] media: qcom: camss: Add support for setting CSIPHY clock name csiphyX

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Date:   Mon, 14 Aug 2023 16:12:43 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     rfoss@...nel.org, todor.too@...il.com, bryan.odonoghue@...aro.org,
        agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        mchehab@...nel.org, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
        andrey.konovalov@...aro.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v0 13/13] media: qcom: camss: Add support for setting CSIPHY clock name csiphyX

Several of our upstream and soon-to-be upstream SoC CAMSS dtsi declare
csiphyX as opposed to the older clock name csiX_phy.

For newer SoCs csiphyX turns out to be a clock you really need to set.

On sc8280xp for example we will encounter difficult to track down and
root-cause RX CRC errors without setting the csiX_phy clock. On sdm845 and
sm8250 we declare the csiXphy clock but seem to get away with not setting
it.

The right approach here is to set the clock when it is declared. If a SoC
doesn't require or a SoC driver implementer doesn't think we need, then the
clock ought to simply be omitted from the clock list.

Include csiphyX in the set of permissible strings which will subsequently
lead to the csiphyX clock being set during csiphy_set_clock_rates() phase.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 drivers/media/platform/qcom/camss/camss-csiphy.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
index baf78c525fbfc..d9c751f457703 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy.c
+++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
@@ -687,6 +687,10 @@ int msm_csiphy_subdev_init(struct camss *camss,
 				if (csiphy->rate_set[i])
 					break;
 			}
+
+			csiphy->rate_set[i] = csiphy_match_clock_name(clock->name, "csiphy%d", k);
+			if (csiphy->rate_set[i])
+				break;
 		}
 	}

-- 
2.41.0