/*
* csi2_set_stream - Enable/Disable streaming on the CSI2 module
* @sd: ISP CSI2 V4L2 subdevice
* @enable: ISP pipeline stream state
*
* Return 0 on success or a negative error code otherwise.
*/
static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
{
struct isp_csi2_device *csi2 = v4l2_get_subdevdata(sd);
struct isp_device *isp = csi2->isp;
struct isp_pipeline *pipe = to_isp_pipeline(&csi2->subdev.entity);
struct isp_video *video_out = &csi2->video_out;
switch (enable) {
case ISP_PIPELINE_STREAM_CONTINUOUS:
if (isp_csiphy_acquire(csi2->phy) < 0)
return -ENODEV;
csi2->use_fs_irq = pipe->do_propagation;
if (csi2->output & CSI2_OUTPUT_MEMORY)
isp_sbl_enable(isp, OMAP3_ISP_SBL_CSI2A_WRITE);
isp_csi2_configure(csi2);
isp_csi2_print_status(csi2);
/*
* When outputting to memory with no buffer available, let the
* buffer queue handler start the hardware. A DMA queue flag
* ISP_VIDEO_DMAQUEUE_QUEUED will be set as soon as there is
* a buffer available.
*/
if (csi2->output & CSI2_OUTPUT_MEMORY &&
!(video_out->dmaqueue_flags & ISP_VIDEO_DMAQUEUE_QUEUED))
break;
/* Enable context 0 and IRQs */
atomic_set(&csi2->stopping, 0);
isp_csi2_ctx_enable(isp, csi2, 0, 1);
isp_csi2_if_enable(isp, csi2, 1);
isp_video_dmaqueue_flags_clr(video_out);
break;
case ISP_PIPELINE_STREAM_STOPPED:
if (csi2->state == ISP_PIPELINE_STREAM_STOPPED)
return 0;
if (isp_module_sync_idle(&sd->entity, &csi2->wait,
&csi2->stopping))
dev_dbg(isp->dev, "%s: module stop timeout.\n",
sd->name);
isp_csi2_ctx_enable(isp, csi2, 0, 0);
isp_csi2_if_enable(isp, csi2, 0);
isp_csi2_irq_ctx_set(isp, csi2, 0);
isp_csiphy_release(csi2->phy);
isp_video_dmaqueue_flags_clr(video_out);
isp_sbl_disable(isp, OMAP3_ISP_SBL_CSI2A_WRITE);
break;
}
csi2->state = enable;
return 0;
}
/*
* csi2_queue - Queues the first buffer when using memory output
* @video: The video node
* @buffer: buffer to queue
*/
static int csi2_queue(struct isp_video *video, struct isp_buffer *buffer)
{
struct isp_device *isp = video->isp;
struct isp_csi2_device *csi2 = &isp->isp_csi2a;
csi2_set_outaddr(csi2, buffer->dma);
/*
* If streaming was enabled before there was a buffer queued
* or underrun happened in the ISR, the hardware was not enabled
* and DMA queue flag ISP_VIDEO_DMAQUEUE_UNDERRUN is still set.
* Enable it now.
*/
if (csi2->video_out.dmaqueue_flags & ISP_VIDEO_DMAQUEUE_UNDERRUN) {
/* Enable / disable context 0 and IRQs */
csi2_if_enable(isp, csi2, 1);
csi2_ctx_enable(isp, csi2, 0, 1);
isp_video_dmaqueue_flags_clr(&csi2->video_out);
}
return 0;
}