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media: stm32-dcmi: code cleanup 

Minor non-functional fixes around comments, variable namings
and trace point enhancement.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hugues Fruchet 2018-06-11 05:50:09 -04:00 committed by Mauro Carvalho Chehab
parent bfe75f76d7
commit 4b84e75020
1 changed files with 8 additions and 10 deletions
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18
drivers/media/platform/stm32/stm32-dcmi.c
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@ -248,13 +248,12 @@ static int dcmi_restart_capture(struct stm32_dcmi *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;
struct dcmi_buf *buf = dcmi->active;
/* Check DMA status */
status = dmaengine_tx_status(chan, dcmi->dma_cookie, &state);
status = dmaengine_tx_status(dcmi->dma_chan, dcmi->dma_cookie, &state);
switch (status) {
case DMA_IN_PROGRESS:
@ -308,10 +307,11 @@ static int dcmi_start_dma(struct stm32_dcmi *dcmi,
/* Prepare a DMA transaction */
desc = dmaengine_prep_slave_single(dcmi->dma_chan, buf->paddr,
buf->size,
DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT);
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT);
if (!desc) {
dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_single failed for buffer size %zu\n",
__func__, buf->size);
dev_err(dcmi->dev, "%s: DMA dmaengine_prep_slave_single failed for buffer phy=%pad size=%zu\n",
__func__, &buf->paddr, buf->size);
return -EINVAL;
}
@ -377,7 +377,6 @@ 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)
@ -385,8 +384,7 @@ static void dcmi_process_jpeg(struct stm32_dcmi *dcmi)
/*
* Because of variable JPEG buffer size sent by sensor,
* DMA transfer never completes due to transfer size
* never reached.
* 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
@ -395,10 +393,10 @@ static void dcmi_process_jpeg(struct stm32_dcmi *dcmi)
*/
/* Drain DMA */
dmaengine_synchronize(chan);
dmaengine_synchronize(dcmi->dma_chan);
/* Get DMA residue to get JPEG size */
status = dmaengine_tx_status(chan, dcmi->dma_cookie, &state);
status = dmaengine_tx_status(dcmi->dma_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);