linux-kernel - [PATCH v3 07/15] media: qcom: camss: Capture VFE CSID dependency in a helper function

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Date:   Wed, 23 Aug 2023 11:44:36 +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 v3 07/15] media: qcom: camss: Capture VFE CSID dependency in a helper function

>From sdm845 onwards we need to ensure the VFE is powered on prior to
switching on the CSID.

Alternatively we could model up the GDSCs and clocks the CSID needs
without the VFE but, there's a real question of the legitimacy of such a
use-case.

For now drawing a line at sdm845 and switching on the associated VFEs is
a perfectly valid thing to do.

Rather than continually extend out this clause for at least two new SoCs
with this same model - making the vfe_get/vfe_put path start to look
like spaghetti we can encoded the dependency in a helper function.

Use csid_depends_vfe() for this purpose.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 .../media/platform/qcom/camss/camss-csid.c    | 20 +++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c
index 08991b070bd61..fd04ed112b564 100644
--- a/drivers/media/platform/qcom/camss/camss-csid.c
+++ b/drivers/media/platform/qcom/camss/camss-csid.c
@@ -146,6 +146,22 @@ static int csid_set_clock_rates(struct csid_device *csid)
 	return 0;
 }
 
+static bool csid_depends_vfe(u32 version)
+{
+	bool ret = false;
+
+	switch (version) {
+	case CAMSS_845:
+	case CAMSS_8250:
+		ret = true;
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
 /*
  * csid_set_power - Power on/off CSID module
  * @sd: CSID V4L2 subdevice
@@ -163,7 +179,7 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
 	int ret = 0;
 
 	if (on) {
-		if (version == CAMSS_8250 || version == CAMSS_845) {
+		if (csid_depends_vfe(version)) {
 			ret = vfe_get(vfe);
 			if (ret < 0)
 				return ret;
@@ -217,7 +233,7 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
 		regulator_bulk_disable(csid->num_supplies,
 				       csid->supplies);
 		pm_runtime_put_sync(dev);
-		if (version == CAMSS_8250 || version == CAMSS_845)
+		if (csid_depends_vfe(version))
 			vfe_put(vfe);
 	}
 
-- 
2.41.0