linux-kernel - [PATCH v4 27/36] media: imx: csi: add support for bayer formats

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1487211578-11360-28-git-send-email-steve_longerbeam@mentor.com>
Date:   Wed, 15 Feb 2017 18:19:29 -0800
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        kernel@...gutronix.de, fabio.estevam@....com,
        linux@...linux.org.uk, mchehab@...nel.org, hverkuil@...all.nl,
        nick@...anahar.org, markus.heiser@...marIT.de,
        p.zabel@...gutronix.de, laurent.pinchart+renesas@...asonboard.com,
        bparrot@...com, geert@...ux-m68k.org, arnd@...db.de,
        sudipm.mukherjee@...il.com, minghsiu.tsai@...iatek.com,
        tiffany.lin@...iatek.com, jean-christophe.trotin@...com,
        horms+renesas@...ge.net.au, niklas.soderlund+renesas@...natech.se,
        robert.jarzmik@...e.fr, songjun.wu@...rochip.com,
        andrew-ct.chen@...iatek.com, gregkh@...uxfoundation.org,
        shuah@...nel.org, sakari.ailus@...ux.intel.com, pavel@....cz
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Russell King <rmk+kernel@...linux.org.uk>,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: [PATCH v4 27/36] media: imx: csi: add support for bayer formats

From: Russell King <rmk+kernel@...linux.org.uk>

Bayer formats must be treated as generic data and passthrough mode must
be used.  Add the correct setup for these formats.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>

- added check to csi_link_validate() to verify that destination is
  IDMAC output pad when passthrough conditions exist: bayer formats
  and 16-bit parallel buses.

Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
---
 drivers/staging/media/imx/imx-media-csi.c | 50 ++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 0343fc3..ae24b42 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -2,6 +2,7 @@
  * V4L2 Capture CSI Subdev for Freescale i.MX5/6 SOC
  *
  * Copyright (c) 2014-2016 Mentor Graphics Inc.
+ * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@...gutronix.de>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -271,10 +272,11 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 	struct imx_media_video_dev *vdev = priv->vdev;
 	struct v4l2_of_endpoint *sensor_ep;
 	struct v4l2_mbus_framefmt *infmt;
-	unsigned int burst_size;
 	struct ipu_image image;
+	u32 passthrough_bits;
 	dma_addr_t phys[2];
 	bool passthrough;
+	u32 burst_size;
 	int ret;
 
 	infmt = &priv->format_mbus[CSI_SINK_PAD];
@@ -301,15 +303,38 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 	ipu_cpmem_set_burstsize(priv->idmac_ch, burst_size);
 
 	/*
-	 * If the sensor uses 16-bit parallel CSI bus, we must handle
-	 * the data internally in the IPU as 16-bit generic, aka
-	 * passthrough mode.
+	 * Check for conditions that require the IPU to handle the
+	 * data internally as generic data, aka passthrough mode:
+	 * - raw bayer formats
+	 * - the sensor bus is 16-bit parallel
 	 */
-	passthrough = (sensor_ep->bus_type != V4L2_MBUS_CSI2 &&
-		       sensor_ep->bus.parallel.bus_width >= 16);
+	switch (image.pix.pixelformat) {
+	case V4L2_PIX_FMT_SBGGR8:
+	case V4L2_PIX_FMT_SGBRG8:
+	case V4L2_PIX_FMT_SGRBG8:
+	case V4L2_PIX_FMT_SRGGB8:
+		burst_size = 8;
+		passthrough = true;
+		passthrough_bits = 8;
+		break;
+	case V4L2_PIX_FMT_SBGGR16:
+	case V4L2_PIX_FMT_SGBRG16:
+	case V4L2_PIX_FMT_SGRBG16:
+	case V4L2_PIX_FMT_SRGGB16:
+		burst_size = 4;
+		passthrough = true;
+		passthrough_bits = 16;
+		break;
+	default:
+		passthrough = (sensor_ep->bus_type != V4L2_MBUS_CSI2 &&
+			       sensor_ep->bus.parallel.bus_width >= 16);
+		passthrough_bits = 16;
+		break;
+	}
 
 	if (passthrough)
-		ipu_cpmem_set_format_passthrough(priv->idmac_ch, 16);
+		ipu_cpmem_set_format_passthrough(priv->idmac_ch,
+						 passthrough_bits);
 
 	/*
 	 * Set the channel for the direct CSI-->memory via SMFC
@@ -695,6 +720,7 @@ static int csi_link_validate(struct v4l2_subdev *sd,
 			     struct v4l2_subdev_format *sink_fmt)
 {
 	struct csi_priv *priv = v4l2_get_subdevdata(sd);
+	const struct imx_media_pixfmt *incc;
 	struct v4l2_of_endpoint *sensor_ep;
 	bool is_csi2;
 	int ret;
@@ -713,8 +739,16 @@ static int csi_link_validate(struct v4l2_subdev *sd,
 	}
 
 	sensor_ep = &priv->sensor->sensor_ep;
-
 	is_csi2 = (sensor_ep->bus_type == V4L2_MBUS_CSI2);
+	incc = priv->cc[CSI_SINK_PAD];
+
+	if (priv->dest != IPU_CSI_DEST_IDMAC &&
+	    (incc->bayer || (!is_csi2 &&
+			     sensor_ep->bus.parallel.bus_width >= 16))) {
+		v4l2_err(&priv->sd,
+			 "bayer/16-bit parallel buses must go to IDMAC pad\n");
+		return -EINVAL;
+	}
 
 	if (is_csi2) {
 		int vc_num = 0;
-- 
2.7.4