linux-kernel - [PATCH v3 09/13] media: cadence: csi2rx: Use new enable stream APIs

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Message-ID: <20250417065554.437541-10-r-donadkar@ti.com>
Date: Thu, 17 Apr 2025 12:25:50 +0530
From: Rishikesh Donadkar <r-donadkar@...com>
To: <jai.luthra@...ux.dev>, <mripard@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <r-donadkar@...com>, <devarsht@...com>,
        <y-abhilashchandra@...com>, <mchehab@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <vaishnav.a@...com>,
        <s-jain1@...com>, <vigneshr@...com>, <sakari.ailus@...ux.intel.com>,
        <hverkuil-cisco@...all.nl>, <tomi.valkeinen@...asonboard.com>,
        <jai.luthra@...asonboard.com>, <changhuang.liang@...rfivetech.com>,
        <jack.zhu@...rfivetech.com>, <laurent.pinchart@...asonboard.com>
Subject: [PATCH v3 09/13] media: cadence: csi2rx: Use new enable stream APIs

From: Jai Luthra <j-luthra@...com>

The enable_streams() API in v4l2 supports passing a bitmask to enable
each pad/stream combination individually on any media subdev instead of
doing s_stream(1) to start all streams on the subdev at once.

This API is implemented by ds90ub960 driver (FPDLink deser) and thus the
caller (cdns-csi2x) is required to use it. For now we only enable
stream0.

Signed-off-by: Jai Luthra <j-luthra@...com>
Signed-off-by: Rishikesh Donadkar <r-donadkar@...com>
---
 drivers/media/platform/cadence/cdns-csi2rx.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index b7e9225f66a41..df05d278df379 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -224,10 +224,18 @@ static int csi2rx_configure_ext_dphy(struct csi2rx_priv *csi2rx)
 static int csi2rx_start(struct csi2rx_priv *csi2rx)
 {
 	unsigned int i;
+	struct media_pad *remote_pad;
 	unsigned long lanes_used = 0;
 	u32 reg;
 	int ret;
 
+	remote_pad = media_pad_remote_pad_first(&csi2rx->pads[CSI2RX_PAD_SINK]);
+	if (!remote_pad) {
+		dev_err(csi2rx->dev,
+			"Failed to find connected source\n");
+		return -ENODEV;
+	}
+
 	ret = clk_prepare_enable(csi2rx->p_clk);
 	if (ret)
 		return ret;
@@ -311,7 +319,8 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
 
 	reset_control_deassert(csi2rx->sys_rst);
 
-	ret = v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, true);
+	ret = v4l2_subdev_enable_streams(csi2rx->source_subdev,
+					 remote_pad->index, BIT(0));
 	if (ret)
 		goto err_disable_sysclk;
 
@@ -339,6 +348,7 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
 
 static void csi2rx_stop(struct csi2rx_priv *csi2rx)
 {
+	struct media_pad *remote_pad;
 	unsigned int i;
 	u32 val;
 	int ret;
@@ -367,8 +377,12 @@ static void csi2rx_stop(struct csi2rx_priv *csi2rx)
 	reset_control_assert(csi2rx->p_rst);
 	clk_disable_unprepare(csi2rx->p_clk);
 
-	if (v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, false))
+	remote_pad = media_pad_remote_pad_first(&csi2rx->pads[CSI2RX_PAD_SINK]);
+	if (!remote_pad ||
+	    v4l2_subdev_disable_streams(csi2rx->source_subdev,
+					remote_pad->index, BIT(0))) {
 		dev_warn(csi2rx->dev, "Couldn't disable our subdev\n");
+	}
 
 	if (csi2rx->dphy) {
 		writel(0, csi2rx->base + CSI2RX_DPHY_LANE_CTRL_REG);
-- 
2.34.1