michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: dma for stm32u5 returns from a repeated start or stop command

Browse source 
On a repeated dma_start, the stm3u5 dma driver should return
immediately if it is already started.
On a repeated dma_stop, the stm3u5 dma driver should return
immediately if it is already stopped.
This like the dma driver does for other stm32 series.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2023-02-03 11:56:44 +01:00 • committed by Stephanos Ioannidis
commit 4de473e4c9
1 changed files with 19 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

20
drivers/dma/dma_stm32u5.c
View file

@ -188,6 +188,14 @@ void stm32_dma_enable_stream(DMA_TypeDef *dma, uint32_t id)
LL_DMA_EnableChannel(dma, dma_stm32_id_to_stream(id)); LL_DMA_EnableChannel(dma, dma_stm32_id_to_stream(id));
} }
bool stm32_dma_is_enabled_stream(DMA_TypeDef *dma, uint32_t id)
{
if (LL_DMA_IsEnabledChannel(dma, dma_stm32_id_to_stream(id)) == 1) {
return true;
}
return false;
}
int stm32_dma_disable_stream(DMA_TypeDef *dma, uint32_t id) int stm32_dma_disable_stream(DMA_TypeDef *dma, uint32_t id)
{ {
/* GPDMA channel abort sequence */ /* GPDMA channel abort sequence */
@ -196,7 +204,7 @@ int stm32_dma_disable_stream(DMA_TypeDef *dma, uint32_t id)
/* reset the channel will disable it */ /* reset the channel will disable it */
LL_DMA_ResetChannel(dma, dma_stm32_id_to_stream(id)); LL_DMA_ResetChannel(dma, dma_stm32_id_to_stream(id));
if (!LL_DMA_IsEnabledChannel(dma, dma_stm32_id_to_stream(id))) { if (!stm32_dma_is_enabled_stream(dma, id)) {
return 0; return 0;
} }
@ -552,6 +560,11 @@ static int dma_stm32_start(const struct device *dev, uint32_t id)
return -EINVAL; return -EINVAL;
} }
/* Repeated start : return now if channel is already started */
if (stm32_dma_is_enabled_stream(dma, id)) {
return 0;
}
/* When starting the dma, the stream is busy before enabling */ /* When starting the dma, the stream is busy before enabling */
stream = &config->streams[id]; stream = &config->streams[id];
stream->busy = true; stream->busy = true;
@ -617,6 +630,11 @@ static int dma_stm32_stop(const struct device *dev, uint32_t id)
return -EINVAL; return -EINVAL;
} }
/* Repeated stop : return now if channel is already stopped */
if (!stm32_dma_is_enabled_stream(dma, id)) {
return 0;
}
LL_DMA_DisableIT_TC(dma, dma_stm32_id_to_stream(id)); LL_DMA_DisableIT_TC(dma, dma_stm32_id_to_stream(id));
dma_stm32_clear_stream_irq(dev, id); dma_stm32_clear_stream_irq(dev, id);