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dmaengine: qcom_hidma: prevent disable in error

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When an error is observed, we try to disable the channel and prevent
further accesses from the client.

Depending on the type of error, transitioning into disabled state might
not be possible. Adding a check to make sure that HW is in enabled/running
state before the disable transition happens.

Signed-off-by: Sinan Kaya <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
This commit is contained in:
Sinan Kaya 2016-10-06 15:33:14 -04:00 • committed by Vinod Koul
commit 7dcec7577d
1 changed files with 2 additions and 13 deletions
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15
drivers/dma/qcom/hidma_ll.c
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@ -564,19 +564,8 @@ int hidma_ll_disable(struct hidma_lldev *lldev)
u32 val;
int ret;
val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
lldev->evch_state = HIDMA_CH_STATE(val);
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
lldev->trch_state = HIDMA_CH_STATE(val);
/* already suspended by this OS */
if ((lldev->trch_state == HIDMA_CH_SUSPENDED) ||
(lldev->evch_state == HIDMA_CH_SUSPENDED))
return 0;
/* already stopped by the manager */
if ((lldev->trch_state == HIDMA_CH_STOPPED) ||
(lldev->evch_state == HIDMA_CH_STOPPED))
/* The channel needs to be in working state */
if (!hidma_ll_isenabled(lldev))
return 0;
val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);