linux-kernel - [PATCH v8 08/16] media: cadence: csi2rx: Configure DPHY using link freq

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Message-ID: <20230731-upstream_csi-v8-8-fb7d3661c2c9@ti.com>
Date:   Mon, 31 Jul 2023 13:59:26 +0530
From:   Jai Luthra <j-luthra@...com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
CC:     <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        <niklas.soderlund+renesas@...natech.se>,
        Benoit Parrot <bparrot@...com>,
        Vaishnav Achath <vaishnav.a@...com>,
        Vignesh Raghavendra <vigneshr@...com>, <nm@...com>,
        <devarsht@...com>, <j-luthra@...com>
Subject: [PATCH v8 08/16] media: cadence: csi2rx: Configure DPHY using link freq

From: Pratyush Yadav <p.yadav@...com>

Some platforms like TI's J721E can have the CSI2RX paired with an
external DPHY. Use the generic PHY framework to configure the DPHY with
the correct link frequency.

Signed-off-by: Pratyush Yadav <p.yadav@...com>
Co-authored-by: Jai Luthra <j-luthra@...com>
Signed-off-by: Jai Luthra <j-luthra@...com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
---
v7->v8
- Drop original patch in-lieu of already merged
  https://lore.kernel.org/linux-media/20230523085626.3295-5-jack.zhu@starfivetech.com/
- Add a new patch to configure DPHY using link_freq control from the
  source

 drivers/media/platform/cadence/cdns-csi2rx.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index 4f9654366485..2a80c66fb547 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -149,8 +149,33 @@ static void csi2rx_reset(struct csi2rx_priv *csi2rx)
 static int csi2rx_configure_ext_dphy(struct csi2rx_priv *csi2rx)
 {
 	union phy_configure_opts opts = { };
+	struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
+	struct v4l2_subdev_format sd_fmt = {
+		.which	= V4L2_SUBDEV_FORMAT_ACTIVE,
+		.pad	= CSI2RX_PAD_SINK,
+		.stream	= 0,
+	};
+	const struct csi2rx_fmt *fmt;
+	s64 link_freq;
 	int ret;
 
+	ret = v4l2_subdev_call_state_active(&csi2rx->subdev, pad, get_fmt,
+					    &sd_fmt);
+	if (ret < 0)
+		return ret;
+
+	fmt = csi2rx_get_fmt_by_code(sd_fmt.format.code);
+
+	link_freq = v4l2_get_link_freq(csi2rx->source_subdev->ctrl_handler,
+				       fmt->bpp, 2 * csi2rx->num_lanes);
+	if (link_freq < 0)
+		return link_freq;
+
+	ret = phy_mipi_dphy_get_default_config_for_hsclk(link_freq,
+							 csi2rx->num_lanes, cfg);
+	if (ret)
+		return ret;
+
 	ret = phy_power_on(csi2rx->dphy);
 	if (ret)
 		return ret;

-- 
2.41.0