[PATCH v4 6/8] [media] s5p-jpeg: Decode 4:1:1 chroma subsampling format

[Thierry Escande]

From: Tony K Nadackal <tony...@samsung.com>

This patch adds support for decoding 4:1:1 chroma subsampling in the
jpeg header parsing function.

Signed-off-by: Tony K Nadackal <tony...@samsung.com>
Signed-off-by: Thierry Escande <thierry.esca...@collabora.com>
Acked-by: Andrzej Pietrasiewicz <andrze...@samsung.com>
Acked-by: Jacek Anaszewski <jacek.anaszew...@gmail.com>
---
 drivers/media/platform/s5p-jpeg/jpeg-core.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c 
b/drivers/media/platform/s5p-jpeg/jpeg-core.c
index 0783809..cca0fb8 100644
--- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
+++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
@@ -1099,6 +1099,8 @@ static void skip(struct s5p_jpeg_buffer *buf, long len)
 static bool s5p_jpeg_subsampling_decode(struct s5p_jpeg_ctx *ctx,
                                        unsigned int subsampling)
 {
+       unsigned int version;
+
        switch (subsampling) {
        case 0x11:
                ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444;
@@ -1112,6 +1114,19 @@ static bool s5p_jpeg_subsampling_decode(struct 
s5p_jpeg_ctx *ctx,
        case 0x33:
                ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY;
                break;
+       case 0x41:
+               /*
+                * 4:1:1 subsampling only supported by 3250, 5420, and 5433
+                * variants
+                */
+               version = ctx->jpeg->variant->version;
+               if (version != SJPEG_EXYNOS3250 &&
+                   version != SJPEG_EXYNOS5420 &&
+                   version != SJPEG_EXYNOS5433)
+                       return false;
+
+               ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_411;
+               break;
        default:
                return false;
        }
-- 
2.7.4