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stm32h7:dma Remove CPU lock on HW fail

This commit is contained in:
David Sidrane 2023-02-16 06:48:21 -08:00 committed by Xiang Xiao
parent 8064f60a9e
commit d2ea49109a
1 changed files with 70 additions and 6 deletions
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76
arch/arm/src/stm32h7/stm32_dma.c
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@ -241,6 +241,13 @@ static DMA_CHANNEL stm32_dma_channel_get(uint8_t channel,
static void stm32_gdma_limits_get(uint8_t controller, uint8_t *first,
uint8_t *last);
static inline void dmachan_modifyreg32(DMA_CHANNEL dmachan,
uint32_t offset, uint32_t clrbits,
uint32_t setbits)
{
modifyreg32(dmachan->base + offset, clrbits, setbits);
}
/****************************************************************************
* Private Data
****************************************************************************/
@ -1210,6 +1217,7 @@ static int stm32_sdma_interrupt(int irq, void *context, void *arg)
static void stm32_sdma_setup(DMA_HANDLE handle, stm32_dmacfg_t *cfg)
{
uint32_t timeout;
DMA_CHANNEL dmachan = (DMA_CHANNEL)handle;
uint32_t regoffset = 0;
uint32_t regval = 0;
@ -1235,7 +1243,37 @@ static void stm32_sdma_setup(DMA_HANDLE handle, stm32_dmacfg_t *cfg)
* for the EN bit to be cleared before starting any stream configuration."
*/
while ((dmachan_getreg(dmachan, STM32_DMA_SCR_OFFSET) & DMA_SCR_EN) != 0);
/* Drivers using DMA should manage the streams. If a DMA request
* is not made on an error or an abort occurs. The driver should
* stop the DMA. If it fails to do so we can not just hang waiting
* on the HW that will not change state.
*
* If at the end of waiting the HW is still not ready there is a HW problem
* or a SW usage problem.
*
* Enable DEBUGASSERT to detect this.
*/
if ((dmachan_getreg(dmachan, STM32_DMA_SCR_OFFSET) & DMA_SCR_EN) != 0)
{
/* Attempt to disable the DMA stream and wait up to a 100 us for it
* to stop.
*/
dmachan_modifyreg32(dmachan, STM32_DMA_SCR_OFFSET, DMA_SCR_EN, 0);
timeout = 100;
while (timeout != 0 &&
(dmachan_getreg(dmachan, STM32_DMA_SCR_OFFSET) &
DMA_SCR_EN) != 0)
{
up_udelay(1);
timeout--;
}
DEBUGASSERT(timeout != 0 &&
(dmachan_getreg(dmachan, STM32_DMA_SCR_OFFSET) &
DMA_SCR_EN) == 0);
}
/* "... All the stream dedicated bits set in the status register (DMA_LISR
* and DMA_HISR) from the previous data block DMA transfer should be
@ -1804,6 +1842,7 @@ static inline int32_t stm32_sdma_scr_2_bdma_ccr(int32_t scr)
static void stm32_bdma_setup(DMA_HANDLE handle, stm32_dmacfg_t *cfg)
{
uint32_t timeout;
DMA_CHANNEL dmachan = (DMA_CHANNEL)handle;
uint32_t regval = 0;
uint32_t scr = cfg->cfg1;
@ -1829,12 +1868,37 @@ static void stm32_bdma_setup(DMA_HANDLE handle, stm32_dmacfg_t *cfg)
* for the EN bit to be cleared before starting any stream configuration."
*/
regval = dmachan_getreg(dmachan, STM32_BDMACH_CCR_OFFSET);
regval &= ~BDMA_CCR_EN;
dmachan_putreg(dmachan, STM32_BDMACH_CCR_OFFSET, regval);
/* Drivers using DMA should manage the streams. If a DMA request
* is not made on an error or an abort occurs. The driver should
* stop the DMA. If it fails to do so we can not just hang waiting
* on the HW that will not change state.
*
* If at the end of waiting the HW is still not ready there is a HW problem
* or a SW usage problem.
*
* Enable DEBUGASSERT to detect this.
*/
while ((dmachan_getreg(dmachan, STM32_BDMACH_CCR_OFFSET) &
BDMA_CCR_EN) != 0);
if ((dmachan_getreg(dmachan, STM32_BDMACH_CCR_OFFSET) & BDMA_CCR_EN) != 0)
{
/* Attempt to disable the DMA stream and wait up to a 100 us for it
* to stop.
*/
dmachan_modifyreg32(dmachan, STM32_BDMACH_CCR_OFFSET, BDMA_CCR_EN, 0);
timeout = 100;
while (timeout != 0 &&
(dmachan_getreg(dmachan, STM32_BDMACH_CCR_OFFSET) &
BDMA_CCR_EN) != 0)
{
up_udelay(1);
timeout--;
}
DEBUGASSERT(timeout != 0 &&
(dmachan_getreg(dmachan, STM32_BDMACH_CCR_OFFSET) &
BDMA_CCR_EN) == 0);
}
/* "... All the stream dedicated bits set in the status register BDMA_ISR
* from the previous data block DMA transfer should be cleared before the