[PATCH] media: soc_camera: don't clear pix->sizeimage in JPEG mode when try_fmt

[Albert Wang]

In JPEG mode, the size of image is variable due to different JPEG compress rate
We only can get the pix->sizeimage from user in USERPTR mode

If we clear pix->sizeimage in soc_camera_try_fmt() then we will get it from:
        ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
                                pix->height);
        if (ret < 0)
                return ret;

        pix->sizeimage = max_t(u32, pix->sizeimage, ret);

In general, this sizeimage will large than the actul JPEG image size

But vb2 will check the buffer and size of image in __qbuf_userptr():
        /* Check if the provided plane buffer is large enough */
        if (planes[plane].length < q->plane_sizes[plane])

So we shouldn't clear the pix->sizeimage and also shouldn't re-calculate
the pix->sizeimage in soc_mbus_image_size() in JPEG mode

For pix->bytesperline, also shouldn't re-calculate it from:
        ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
        if (ret < 0)
                return ret;

        pix->bytesperline = max_t(u32, pix->bytesperline, ret);

pix->bytesperline also should be set from user or
from driver try_fmt() implementation

Change-Id: I700690a2287346127a624b5260922eaa5427a596
Signed-off-by: Albert Wang <twan...@marvell.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
---
 drivers/media/video/soc_camera.c   |    3 ++-
 drivers/media/video/soc_mediabus.c |    6 ++++++
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index 0421bf9..d929a9c 100755
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -171,7 +171,8 @@ static int soc_camera_try_fmt(struct soc_camera_device *icd,
        dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
                pixfmtstr(pix->pixelformat), pix->width, pix->height);
 
-       if (!(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
+       if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
+               !(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
                pix->bytesperline = 0;
                pix->sizeimage = 0;
        }
diff --git a/drivers/media/video/soc_mediabus.c 
b/drivers/media/video/soc_mediabus.c
index 89dce09..a397812 100755
--- a/drivers/media/video/soc_mediabus.c
+++ b/drivers/media/video/soc_mediabus.c
@@ -378,6 +378,9 @@ EXPORT_SYMBOL(soc_mbus_samples_per_pixel);
 
 s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf)
 {
+       if (mf->fourcc == V4L2_PIX_FMT_JPEG)
+               return 0;
+
        if (mf->layout != SOC_MBUS_LAYOUT_PACKED)
                return width * mf->bits_per_sample / 8;
 
@@ -400,6 +403,9 @@ EXPORT_SYMBOL(soc_mbus_bytes_per_line);
 s32 soc_mbus_image_size(const struct soc_mbus_pixelfmt *mf,
                        u32 bytes_per_line, u32 height)
 {
+       if (mf->fourcc == V4L2_PIX_FMT_JPEG)
+               return 0;
+
        if (mf->layout == SOC_MBUS_LAYOUT_PACKED)
                return bytes_per_line * height;
 
-- 
1.7.0.4

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