linux-kernel - [PATCH 05/14] media: sun6i-csi: Only configure the interface data width for parallel

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Date:   Fri, 23 Oct 2020 19:45:37 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-sunxi@...glegroups.com
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Yong Deng <yong.deng@...ewell.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Hans Verkuil <hverkuil@...all.nl>, kevin.lhopital@...mail.com,
        Kévin L'hôpital 
        <kevin.lhopital@...tlin.com>
Subject: [PATCH 05/14] media: sun6i-csi: Only configure the interface data width for parallel

Bits related to the interface data width do not have any effect when
the CSI controller is taking input from the MIPI CSI-2 controller.

In prevision of adding support for this case, set these bits
conditionally so there is no ambiguity.

Co-developed-by: Kévin L'hôpital <kevin.lhopital@...tlin.com>
Signed-off-by: Kévin L'hôpital <kevin.lhopital@...tlin.com>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
---
 .../platform/sunxi/sun6i-csi/sun6i_csi.c      | 42 +++++++++++--------
 1 file changed, 25 insertions(+), 17 deletions(-)

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
index 5d2389a5cd17..a876a05ea3c7 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
@@ -378,8 +378,13 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
 	unsigned char bus_width;
 	u32 flags;
 	u32 cfg;
+	bool input_parallel = false;
 	bool input_interlaced = false;
 
+	if (endpoint->bus_type == V4L2_MBUS_PARALLEL ||
+	    endpoint->bus_type == V4L2_MBUS_BT656)
+		input_parallel = true;
+
 	if (csi->config.field == V4L2_FIELD_INTERLACED
 	    || csi->config.field == V4L2_FIELD_INTERLACED_TB
 	    || csi->config.field == V4L2_FIELD_INTERLACED_BT)
@@ -395,6 +400,26 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
 		 CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK |
 		 CSI_IF_CFG_SRC_TYPE_MASK);
 
+	if (input_parallel) {
+		switch (bus_width) {
+		case 8:
+			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
+			break;
+		case 10:
+			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
+			break;
+		case 12:
+			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
+			break;
+		case 16: /* No need to configure DATA_WIDTH for 16bit */
+			break;
+		default:
+			dev_warn(sdev->dev, "Unsupported bus width: %u\n",
+				 bus_width);
+			break;
+		}
+	}
+
 	if (input_interlaced)
 		cfg |= CSI_IF_CFG_SRC_TYPE_INTERLACED;
 	else
@@ -440,23 +465,6 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
 		break;
 	}
 
-	switch (bus_width) {
-	case 8:
-		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
-		break;
-	case 10:
-		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
-		break;
-	case 12:
-		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
-		break;
-	case 16: /* No need to configure DATA_WIDTH for 16bit */
-		break;
-	default:
-		dev_warn(sdev->dev, "Unsupported bus width: %u\n", bus_width);
-		break;
-	}
-
 	regmap_write(sdev->regmap, CSI_IF_CFG_REG, cfg);
 }
 
-- 
2.28.0