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[media] soc-camera: Support user-configurable line stride

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Add a capabilities field to the soc_camera_host structure to flag hosts
that support user-configurable line strides. soc_camera_try_fmt() then
passes the user-provided bytesperline and sizeimage format fields to
such hosts, and expects the host to check (and fix if needed) the
values.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[g.liakhovetski@gmx.de: fix a typo in mx2_camera.c]
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart 2012-03-21 08:03:28 -03:00 committed by Mauro Carvalho Chehab
parent b0a461ff1b
commit 914f05c811
3 changed files with 10 additions and 2 deletions
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2
drivers/media/video/mx2_camera.c
View file

@ -1787,6 +1787,8 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
pcdev->soc_host.priv = pcdev;
pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
pcdev->soc_host.nr = pdev->id;
if (cpu_is_mx25())
pcdev->soc_host.capabilities = SOCAM_HOST_CAP_STRIDE;
pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
if (IS_ERR(pcdev->alloc_ctx)) {

6
drivers/media/video/soc_camera.c
View file

@ -171,8 +171,10 @@ 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);
pix->bytesperline = 0;
pix->sizeimage = 0;
if (!(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
pix->bytesperline = 0;
pix->sizeimage = 0;
}
ret = ici->ops->try_fmt(icd, f);
if (ret < 0)

4
include/media/soc_camera.h
View file

@ -56,11 +56,15 @@ struct soc_camera_device {
};
};
/* Host supports programmable stride */
#define SOCAM_HOST_CAP_STRIDE (1 << 0)
struct soc_camera_host {
struct v4l2_device v4l2_dev;
struct list_head list;
struct mutex host_lock; /* Protect during probing */
unsigned char nr; /* Host number */
u32 capabilities;
void *priv;
const char *drv_name;
struct soc_camera_host_ops *ops;