V4L/DVB (8611): Add suspend/resume to pxa_camera driver
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>
diff --git a/drivers/media/video/pxa_camera.c b/drivers/media/video/pxa_camera.c
index 28d8fd0..ead87dd 100644
--- a/drivers/media/video/pxa_camera.c
+++ b/drivers/media/video/pxa_camera.c
@@ -128,6 +128,8 @@
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 @@
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,