media: aspeed: refine to avoid full jpeg update

The switch of jpeg 420/444 subsampling will update full jpeg header for
aspeed now.

Just update the 420/444 subsampling part of jpeg header is fine.

Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index 77611c2..ebb5e5a 100644 (file)
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -422,6 +422,21 @@ static void aspeed_video_init_jpeg_table(u32 *table, bool yuv420)
        }
 }
 
+// just update jpeg dct table per 420/444
+static void aspeed_video_update_jpeg_table(u32 *table, bool yuv420)
+{
+       int i;
+       unsigned int base;
+
+       for (i = 0; i < ASPEED_VIDEO_JPEG_NUM_QUALITIES; i++) {
+               base = 256 * i; /* AST HW requires this header spacing */
+               base += ASPEED_VIDEO_JPEG_HEADER_SIZE +
+                       ASPEED_VIDEO_JPEG_DCT_SIZE;
+
+               table[base + 2] = (yuv420) ? 0x00220103 : 0x00110103;
+       }
+}
+
 static void aspeed_video_update(struct aspeed_video *video, u32 reg, u32 clear,
                                u32 bits)
 {
@@ -1289,7 +1304,7 @@ static void aspeed_video_update_jpeg_quality(struct aspeed_video *video)
 static void aspeed_video_update_subsampling(struct aspeed_video *video)
 {
        if (video->jpeg.virt)
-               aspeed_video_init_jpeg_table(video->jpeg.virt, video->yuv420);
+               aspeed_video_update_jpeg_table(video->jpeg.virt, video->yuv420);
 
        if (video->yuv420)
                aspeed_video_update(video, VE_SEQ_CTRL, 0, VE_SEQ_CTRL_YUV420);