Ensure to stop the dma transfer whenever receiving a overrun to avoid having a buffer partially filled with a frame and partially with the next frame.
Signed-off-by: Alain Volmat alain.volmat@foss.st.com --- drivers/media/platform/st/stm32/stm32-dcmi.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/media/platform/st/stm32/stm32-dcmi.c b/drivers/media/platform/st/stm32/stm32-dcmi.c index 0874974bbad4..20f5b9ab6a1c 100644 --- a/drivers/media/platform/st/stm32/stm32-dcmi.c +++ b/drivers/media/platform/st/stm32/stm32-dcmi.c @@ -402,9 +402,21 @@ static irqreturn_t dcmi_irq_thread(int irq, void *arg) spin_lock_irq(&dcmi->irqlock);
if (dcmi->misr & IT_OVR) { + /* Disable capture */ + reg_clear(dcmi->regs, DCMI_CR, CR_CAPTURE); + dcmi->overrun_count++; + if (dcmi->overrun_count > OVERRUN_ERROR_THRESHOLD) dcmi->errors_count++; + + spin_unlock_irq(&dcmi->irqlock); + dmaengine_terminate_sync(dcmi->dma_chan); + + if (dcmi_restart_capture(dcmi)) + dev_err(dcmi->dev, "%s: Cannot restart capture\n", __func__); + + return IRQ_HANDLED; } if (dcmi->misr & IT_ERR) dcmi->errors_count++;