linux-kernel - [PATCH 04/10] media: rcar-csi2: Use v4l2_get_link

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Message-Id: <20250120-rcar-media-impro-v1-4-043823c3893e@ideasonboard.com>
Date: Mon, 20 Jan 2025 15:10:37 +0200
From: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
To: Niklas Söderlund <niklas.soderlund@...natech.se>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Subject: [PATCH 04/10] media: rcar-csi2: Use v4l2_get_link_freq()

Instead of directly using V4L2_CID_PIXEL_RATE and calculating the mbps
from that, use v4l2_get_link_freq(), which also supports
V4L2_CID_LINK_FREQ.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
---
 drivers/media/platform/renesas/rcar-csi2.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/drivers/media/platform/renesas/rcar-csi2.c b/drivers/media/platform/renesas/rcar-csi2.c
index 52d4e333c735..84e6194fed6c 100644
--- a/drivers/media/platform/renesas/rcar-csi2.c
+++ b/drivers/media/platform/renesas/rcar-csi2.c
@@ -8,6 +8,7 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_graph.h>
@@ -15,6 +16,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/sys_soc.h>
+#include <linux/units.h>
 
 #include <media/mipi-csi2.h>
 #include <media/v4l2-ctrls.h>
@@ -953,7 +955,7 @@ static int rcsi2_calc_mbps(struct rcar_csi2 *priv, unsigned int bpp,
 			   unsigned int lanes)
 {
 	struct v4l2_subdev *source;
-	struct v4l2_ctrl *ctrl;
+	s64 freq;
 	u64 mbps;
 
 	if (!priv->remote)
@@ -961,21 +963,17 @@ static int rcsi2_calc_mbps(struct rcar_csi2 *priv, unsigned int bpp,
 
 	source = priv->remote;
 
-	/* Read the pixel rate control from remote. */
-	ctrl = v4l2_ctrl_find(source->ctrl_handler, V4L2_CID_PIXEL_RATE);
-	if (!ctrl) {
-		dev_err(priv->dev, "no pixel rate control in subdev %s\n",
-			source->name);
-		return -EINVAL;
+	freq = v4l2_get_link_freq(source->ctrl_handler, bpp, 2 * lanes);
+	if (freq < 0) {
+		int ret = (int)freq;
+
+		dev_err(priv->dev, "failed to get link freq for %s: %d\n",
+			source->name, ret);
+
+		return ret;
 	}
 
-	/*
-	 * Calculate the phypll in mbps.
-	 * link_freq = (pixel_rate * bits_per_sample) / (2 * nr_of_lanes)
-	 * bps = link_freq * 2
-	 */
-	mbps = v4l2_ctrl_g_ctrl_int64(ctrl) * bpp;
-	do_div(mbps, lanes * 1000000);
+	mbps = div_u64(freq * 2, MEGA);
 
 	/* Adjust for C-PHY, divide by 2.8. */
 	if (priv->cphy)

-- 
2.43.0