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V4L/DVB (8611): Add suspend/resume to pxa_camera driver

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PXA suspend switches off DMA core, which loses all context
of previously assigned descriptors. As pxa_camera driver
relies on DMA transfers, setup the lost descriptors on
resume and retrigger frame acquisition if needed.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Robert Jarzmik 2008-08-02 07:10:04 -03:00 committed by Mauro Carvalho Chehab
parent 2e521061db
commit 3f6ac497b0
1 changed files with 56 additions and 0 deletions
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56
drivers/media/video/pxa_camera.c
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@ -128,6 +128,8 @@ struct pxa_camera_dev {
struct pxa_buffer *active;
struct pxa_dma_desc *sg_tail[3];
u32 save_cicr[5];
};
static const char *pxa_cam_driver_description = "PXA_Camera";
@ -997,10 +999,64 @@ static int pxa_camera_querycap(struct soc_camera_host *ici,
return 0;
}
static int pxa_camera_suspend(struct soc_camera_device *icd, pm_message_t state)
{
struct soc_camera_host *ici =
to_soc_camera_host(icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
int i = 0, ret = 0;
pcdev->save_cicr[i++] = CICR0;
pcdev->save_cicr[i++] = CICR1;
pcdev->save_cicr[i++] = CICR2;
pcdev->save_cicr[i++] = CICR3;
pcdev->save_cicr[i++] = CICR4;
if ((pcdev->icd) && (pcdev->icd->ops->suspend))
ret = pcdev->icd->ops->suspend(pcdev->icd, state);
return ret;
}
static int pxa_camera_resume(struct soc_camera_device *icd)
{
struct soc_camera_host *ici =
to_soc_camera_host(icd->dev.parent);
struct pxa_camera_dev *pcdev = ici->priv;
int i = 0, ret = 0;
DRCMR68 = pcdev->dma_chans[0] | DRCMR_MAPVLD;
DRCMR69 = pcdev->dma_chans[1] | DRCMR_MAPVLD;
DRCMR70 = pcdev->dma_chans[2] | DRCMR_MAPVLD;
CICR0 = pcdev->save_cicr[i++] & ~CICR0_ENB;
CICR1 = pcdev->save_cicr[i++];
CICR2 = pcdev->save_cicr[i++];
CICR3 = pcdev->save_cicr[i++];
CICR4 = pcdev->save_cicr[i++];
if ((pcdev->icd) && (pcdev->icd->ops->resume))
ret = pcdev->icd->ops->resume(pcdev->icd);
/* Restart frame capture if active buffer exists */
if (!ret && pcdev->active) {
/* Reset the FIFOs */
CIFR |= CIFR_RESET_F;
/* Enable End-Of-Frame Interrupt */
CICR0 &= ~CICR0_EOFM;
/* Restart the Capture Interface */
CICR0 |= CICR0_ENB;
}
return ret;
}
static struct soc_camera_host_ops pxa_soc_camera_host_ops = {
.owner = THIS_MODULE,
.add = pxa_camera_add_device,
.remove = pxa_camera_remove_device,
.suspend = pxa_camera_suspend,
.resume = pxa_camera_resume,
.set_fmt_cap = pxa_camera_set_fmt_cap,
.try_fmt_cap = pxa_camera_try_fmt_cap,
.init_videobuf = pxa_camera_init_videobuf,