[PATCH] media: stm32-dcmi: add JPEG support
Hugues FRUCHET
hugues.fruchet at st.com
Wed Feb 28 09:07:14 PST 2018
Hi Hans,
Yes depends on 'fix lock scheme', I'll send a v2 of this jpeg commit for
unneeded V4L2_FMT_FLAG_COMPRESSED.
Best regards,
Hugues.
On 02/26/2018 03:17 PM, Hans Verkuil wrote:
> On 02/22/2018 10:51 AM, Hugues Fruchet wrote:
>> Add DCMI JPEG support.
>
> Does this patch depend on the 'fix lock scheme' patch?
>
> It looks good to me except for one small thing (see below), but I think this
> depends on the 'fix lock scheme' patch, right?
>
>>
>> Signed-off-by: Hugues Fruchet <hugues.fruchet at st.com>
>> ---
>> drivers/media/platform/stm32/stm32-dcmi.c | 195 +++++++++++++++++++++++-------
>> 1 file changed, 148 insertions(+), 47 deletions(-)
>>
>> diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
>> index 269e963..7eaaf7c 100644
>> --- a/drivers/media/platform/stm32/stm32-dcmi.c
>> +++ b/drivers/media/platform/stm32/stm32-dcmi.c
>> @@ -93,6 +93,11 @@ enum state {
>> #define MIN_HEIGHT 16U
>> #define MAX_HEIGHT 2048U
>>
>> +#define MIN_JPEG_WIDTH 16U
>> +#define MAX_JPEG_WIDTH 2592U
>> +#define MIN_JPEG_HEIGHT 16U
>> +#define MAX_JPEG_HEIGHT 2592U
>> +
>> #define TIMEOUT_MS 1000
>>
>> struct dcmi_graph_entity {
>> @@ -191,14 +196,67 @@ static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
>>
>> static int dcmi_start_capture(struct stm32_dcmi *dcmi);
>>
>> +static void dcmi_buffer_done(struct stm32_dcmi *dcmi,
>> + struct dcmi_buf *buf,
>> + size_t bytesused,
>> + int err)
>> +{
>> + struct vb2_v4l2_buffer *vbuf;
>> +
>> + if (!buf)
>> + return;
>> +
>> + vbuf = &buf->vb;
>> +
>> + vbuf->sequence = dcmi->sequence++;
>> + vbuf->field = V4L2_FIELD_NONE;
>> + vbuf->vb2_buf.timestamp = ktime_get_ns();
>> + vb2_set_plane_payload(&vbuf->vb2_buf, 0, bytesused);
>> + vb2_buffer_done(&vbuf->vb2_buf,
>> + err ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
>> + dev_dbg(dcmi->dev, "buffer[%d] done seq=%d, bytesused=%zu\n",
>> + vbuf->vb2_buf.index, vbuf->sequence, bytesused);
>> +
>> + dcmi->buffers_count++;
>> + dcmi->active = NULL;
>> +}
>> +
>> +static int dcmi_restart_capture(struct stm32_dcmi *dcmi)
>> +{
>> + spin_lock_irq(&dcmi->irqlock);
>> +
>> + if (dcmi->state != RUNNING) {
>> + spin_unlock_irq(&dcmi->irqlock);
>> + return -EINVAL;
>> + }
>> +
>> + /* Restart a new DMA transfer with next buffer */
>> + if (list_empty(&dcmi->buffers)) {
>> + dev_err(dcmi->dev, "%s: No more buffer queued, cannot capture buffer\n",
>> + __func__);
>> + dcmi->errors_count++;
>> + dcmi->active = NULL;
>> +
>> + spin_unlock_irq(&dcmi->irqlock);
>> + return -EINVAL;
>> + }
>> +
>> + dcmi->active = list_entry(dcmi->buffers.next,
>> + struct dcmi_buf, list);
>> + list_del_init(&dcmi->active->list);
>> +
>> + spin_unlock_irq(&dcmi->irqlock);
>> +
>> + return dcmi_start_capture(dcmi);
>> +}
>> +
>> static void dcmi_dma_callback(void *param)
>> {
>> struct stm32_dcmi *dcmi = (struct stm32_dcmi *)param;
>> struct dma_chan *chan = dcmi->dma_chan;
>> struct dma_tx_state state;
>> enum dma_status status;
>> -
>> - spin_lock_irq(&dcmi->irqlock);
>> + struct dcmi_buf *buf = dcmi->active;
>>
>> /* Check DMA status */
>> status = dmaengine_tx_status(chan, dcmi->dma_cookie, &state);
>> @@ -216,53 +274,18 @@ static void dcmi_dma_callback(void *param)
>> case DMA_COMPLETE:
>> dev_dbg(dcmi->dev, "%s: Received DMA_COMPLETE\n", __func__);
>>
>> - if (dcmi->active) {
>> - struct dcmi_buf *buf = dcmi->active;
>> - struct vb2_v4l2_buffer *vbuf = &dcmi->active->vb;
>> -
>> - vbuf->sequence = dcmi->sequence++;
>> - vbuf->field = V4L2_FIELD_NONE;
>> - vbuf->vb2_buf.timestamp = ktime_get_ns();
>> - vb2_set_plane_payload(&vbuf->vb2_buf, 0, buf->size);
>> - vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
>> - dev_dbg(dcmi->dev, "buffer[%d] done seq=%d\n",
>> - vbuf->vb2_buf.index, vbuf->sequence);
>> -
>> - dcmi->buffers_count++;
>> - dcmi->active = NULL;
>> - }
>> -
>> - /* Restart a new DMA transfer with next buffer */
>> - if (dcmi->state == RUNNING) {
>> - if (list_empty(&dcmi->buffers)) {
>> - dev_err(dcmi->dev, "%s: No more buffer queued, cannot capture buffer\n",
>> - __func__);
>> - dcmi->errors_count++;
>> - dcmi->active = NULL;
>> -
>> - spin_unlock_irq(&dcmi->irqlock);
>> - return;
>> - }
>> -
>> - dcmi->active = list_entry(dcmi->buffers.next,
>> - struct dcmi_buf, list);
>> -
>> - list_del_init(&dcmi->active->list);
>> -
>> - spin_unlock_irq(&dcmi->irqlock);
>> - if (dcmi_start_capture(dcmi))
>> - dev_err(dcmi->dev, "%s: Cannot restart capture on DMA complete\n",
>> - __func__);
>> - return;
>> - }
>> + /* Return buffer to V4L2 */
>> + dcmi_buffer_done(dcmi, buf, buf->size, 0);
>>
>> + /* Restart capture */
>> + if (dcmi_restart_capture(dcmi))
>> + dev_err(dcmi->dev, "%s: Cannot restart capture on DMA complete\n",
>> + __func__);
>> break;
>> default:
>> dev_err(dcmi->dev, "%s: Received unknown status\n", __func__);
>> break;
>> }
>> -
>> - spin_unlock_irq(&dcmi->irqlock);
>> }
>>
>> static int dcmi_start_dma(struct stm32_dcmi *dcmi,
>> @@ -355,6 +378,52 @@ static void dcmi_set_crop(struct stm32_dcmi *dcmi)
>> reg_set(dcmi->regs, DCMI_CR, CR_CROP);
>> }
>>
>> +static void dcmi_process_jpeg(struct stm32_dcmi *dcmi)
>> +{
>> + struct dma_tx_state state;
>> + enum dma_status status;
>> + struct dma_chan *chan = dcmi->dma_chan;
>> + struct dcmi_buf *buf = dcmi->active;
>> +
>> + if (!buf)
>> + return;
>> +
>> + /*
>> + * Because of variable JPEG buffer size sent by sensor,
>> + * DMA transfer never completes due to transfer size
>> + * never reached.
>> + * In order to ensure that all the JPEG data are transferred
>> + * in active buffer memory, DMA is drained.
>> + * Then DMA tx status gives the amount of data transferred
>> + * to memory, which is then returned to V4L2 through the active
>> + * buffer payload.
>> + */
>> +
>> + /* Drain DMA */
>> + dmaengine_synchronize(chan);
>> +
>> + /* Get DMA residue to get JPEG size */
>> + status = dmaengine_tx_status(chan, dcmi->dma_cookie, &state);
>> + if (status != DMA_ERROR && state.residue < buf->size) {
>> + /* Return JPEG buffer to V4L2 with received JPEG buffer size */
>> + dcmi_buffer_done(dcmi, buf, buf->size - state.residue, 0);
>> + } else {
>> + dcmi->errors_count++;
>> + dev_err(dcmi->dev, "%s: Cannot get JPEG size from DMA\n",
>> + __func__);
>> + /* Return JPEG buffer to V4L2 in ERROR state */
>> + dcmi_buffer_done(dcmi, buf, 0, -EIO);
>> + }
>> +
>> + /* Abort DMA operation */
>> + dmaengine_terminate_all(dcmi->dma_chan);
>> +
>> + /* Restart capture */
>> + if (dcmi_restart_capture(dcmi))
>> + dev_err(dcmi->dev, "%s: Cannot restart capture on JPEG received\n",
>> + __func__);
>> +}
>> +
>> static irqreturn_t dcmi_irq_thread(int irq, void *arg)
>> {
>> struct stm32_dcmi *dcmi = arg;
>> @@ -379,6 +448,14 @@ static irqreturn_t dcmi_irq_thread(int irq, void *arg)
>> dcmi->overrun_count++;
>> }
>>
>> + if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG &&
>> + dcmi->misr & IT_FRAME) {
>> + /* JPEG received */
>> + spin_unlock_irq(&dcmi->irqlock);
>> + dcmi_process_jpeg(dcmi);
>> + return IRQ_HANDLED;
>> + }
>> +
>> spin_unlock_irq(&dcmi->irqlock);
>> return IRQ_HANDLED;
>> }
>> @@ -552,6 +629,10 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
>> if (dcmi->do_crop)
>> dcmi_set_crop(dcmi);
>>
>> + /* Enable jpeg capture */
>> + if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
>> + reg_set(dcmi->regs, DCMI_CR, CR_CM);/* Snapshot mode */
>> +
>> /* Enable dcmi */
>> reg_set(dcmi->regs, DCMI_CR, CR_ENABLE);
>>
>> @@ -752,6 +833,7 @@ static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
>> struct v4l2_subdev_format format = {
>> .which = V4L2_SUBDEV_FORMAT_TRY,
>> };
>> + bool do_crop;
>> int ret;
>>
>> sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
>> @@ -761,10 +843,19 @@ static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
>> }
>>
>> /* Limit to hardware capabilities */
>> - pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
>> - pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
>> + if (pix->pixelformat == V4L2_PIX_FMT_JPEG) {
>> + pix->width = clamp(pix->width, MIN_JPEG_WIDTH, MAX_JPEG_WIDTH);
>> + pix->height =
>> + clamp(pix->height, MIN_JPEG_HEIGHT, MAX_JPEG_HEIGHT);
>> + } else {
>> + pix->width = clamp(pix->width, MIN_WIDTH, MAX_WIDTH);
>> + pix->height = clamp(pix->height, MIN_HEIGHT, MAX_HEIGHT);
>> + }
>> +
>> + /* No crop if JPEG is requested */
>> + do_crop = dcmi->do_crop && (pix->pixelformat != V4L2_PIX_FMT_JPEG);
>>
>> - if (dcmi->do_crop && dcmi->num_of_sd_framesizes) {
>> + if (do_crop && dcmi->num_of_sd_framesizes) {
>> struct dcmi_framesize outer_sd_fsize;
>> /*
>> * If crop is requested and sensor have discrete frame sizes,
>> @@ -788,7 +879,7 @@ static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
>> sd_fsize.width = pix->width;
>> sd_fsize.height = pix->height;
>>
>> - if (dcmi->do_crop) {
>> + if (do_crop) {
>> struct v4l2_rect c = dcmi->crop;
>> struct v4l2_rect max_rect;
>>
>> @@ -843,6 +934,10 @@ static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f)
>> if (ret)
>> return ret;
>>
>> + /* Disable crop if JPEG is requested */
>> + if (pix->pixelformat == V4L2_PIX_FMT_JPEG)
>> + dcmi->do_crop = false;
>> +
>> /* pix to mbus format */
>> v4l2_fill_mbus_format(mf, pix,
>> sd_format->mbus_code);
>> @@ -895,6 +990,8 @@ static int dcmi_enum_fmt_vid_cap(struct file *file, void *priv,
>> return -EINVAL;
>>
>> f->pixelformat = dcmi->sd_formats[f->index]->fourcc;
>> + if (f->pixelformat == V4L2_PIX_FMT_JPEG)
>> + f->flags |= V4L2_FMT_FLAG_COMPRESSED;
>
> Not needed, this is done for you in v4l2-ioctl.c.
>
> Regards,
>
> Hans
>
>> return 0;
>> }
>>
>> @@ -1315,6 +1412,10 @@ static int dcmi_set_default_fmt(struct stm32_dcmi *dcmi)
>> .fourcc = V4L2_PIX_FMT_UYVY,
>> .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
>> .bpp = 2,
>> + }, {
>> + .fourcc = V4L2_PIX_FMT_JPEG,
>> + .mbus_code = MEDIA_BUS_FMT_JPEG_1X8,
>> + .bpp = 1,
>> },
>> };
>>
>>
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