[PATCH 17/26] gpu: ipu-v3: Add ipu_stride_to_bytes()

[Philipp Zabel]

From: Steve Longerbeam <slongerb...@gmail.com>

Adds ipu_stride_to_bytes(), which converts a pixel stride to bytes,
suitable for passing to cpmem.

Signed-off-by: Steve Longerbeam <steve_longerbeam at mentor.com>
Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
---
 drivers/gpu/ipu-v3/ipu-common.c | 30 ++++++++++++++++++++++++++++++
 include/video/imx-ipu-v3.h      |  1 +
 2 files changed, 31 insertions(+)

diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index 985a750..e542d5e 100644
--- a/drivers/gpu/ipu-v3/ipu-common.c
+++ b/drivers/gpu/ipu-v3/ipu-common.c
@@ -126,6 +126,36 @@ enum ipu_color_space ipu_mbus_code_to_colorspace(u32 
mbus_code)
 }
 EXPORT_SYMBOL_GPL(ipu_mbus_code_to_colorspace);

+int ipu_stride_to_bytes(u32 pixel_stride, u32 pixelformat)
+{
+       switch (pixelformat) {
+       case V4L2_PIX_FMT_YUV420:
+       case V4L2_PIX_FMT_YVU420:
+               /*
+                * for the planar YUV formats, the stride passed to
+                * cpmem must be the stride in bytes of the Y plane.
+                * And all the planar YUV formats have an 8-bit
+                * Y component.
+                */
+               return (8 * pixel_stride) >> 3;
+       case V4L2_PIX_FMT_RGB565:
+       case V4L2_PIX_FMT_YUYV:
+       case V4L2_PIX_FMT_UYVY:
+               return (16 * pixel_stride) >> 3;
+       case V4L2_PIX_FMT_BGR24:
+       case V4L2_PIX_FMT_RGB24:
+               return (24 * pixel_stride) >> 3;
+       case V4L2_PIX_FMT_BGR32:
+       case V4L2_PIX_FMT_RGB32:
+               return (32 * pixel_stride) >> 3;
+       default:
+               break;
+       }
+
+       return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(ipu_stride_to_bytes);
+
 int ipu_degrees_to_rot_mode(enum ipu_rotate_mode *mode, int degrees,
                            bool hflip, bool vflip)
 {
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index 84c6477..4a4117c 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -369,6 +369,7 @@ int ipu_smfc_set_watermark(struct ipu_smfc *smfc, u32 
set_level, u32 clr_level);
 enum ipu_color_space ipu_drm_fourcc_to_colorspace(u32 drm_fourcc);
 enum ipu_color_space ipu_pixelformat_to_colorspace(u32 pixelformat);
 enum ipu_color_space ipu_mbus_code_to_colorspace(u32 mbus_code);
+int ipu_stride_to_bytes(u32 pixel_stride, u32 pixelformat);
 bool ipu_pixelformat_is_planar(u32 pixelformat);
 int ipu_degrees_to_rot_mode(enum ipu_rotate_mode *mode, int degrees,
                            bool hflip, bool vflip);
-- 
2.1.0.rc1