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dmaengine: dw: Reset DRAIN bit when resume the channel 

For Intel iDMA 32-bit the channel can be drained on a suspend.
We need to reset the bit on the resume to return a status quo.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Andy Shevchenko 2019-01-07 13:07:39 +02:00 committed by Vinod Koul
parent 69da8be90d
commit 91f0ff883e
4 changed files with 25 additions and 7 deletions
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10
drivers/dma/dw/core.c
View File

@ -846,11 +846,11 @@ static int dwc_pause(struct dma_chan *chan)
return 0;
}
static inline void dwc_chan_resume(struct dw_dma_chan *dwc)
static inline void dwc_chan_resume(struct dw_dma_chan *dwc, bool drain)
{
u32 cfglo = channel_readl(dwc, CFG_LO);
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
dw->resume_chan(dwc, drain);
clear_bit(DW_DMA_IS_PAUSED, &dwc->flags);
}
@ -863,7 +863,7 @@ static int dwc_resume(struct dma_chan *chan)
spin_lock_irqsave(&dwc->lock, flags);
if (test_bit(DW_DMA_IS_PAUSED, &dwc->flags))
dwc_chan_resume(dwc);
dwc_chan_resume(dwc, false);
spin_unlock_irqrestore(&dwc->lock, flags);
@ -886,7 +886,7 @@ static int dwc_terminate_all(struct dma_chan *chan)
dwc_chan_disable(dw, dwc);
dwc_chan_resume(dwc);
dwc_chan_resume(dwc, true);
/* active_list entries will end up before queued entries */
list_splice_init(&dwc->queue, &list);

8
drivers/dma/dw/dw.c
View File

@ -35,6 +35,13 @@ static void dw_dma_suspend_chan(struct dw_dma_chan *dwc, bool drain)
channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
}
static void dw_dma_resume_chan(struct dw_dma_chan *dwc, bool drain)
{
u32 cfglo = channel_readl(dwc, CFG_LO);
channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
}
static u32 dw_dma_bytes2block(struct dw_dma_chan *dwc,
size_t bytes, unsigned int width, size_t *len)
{
@ -91,6 +98,7 @@ int dw_dma_probe(struct dw_dma_chip *chip)
/* Channel operations */
dw->initialize_chan = dw_dma_initialize_chan;
dw->suspend_chan = dw_dma_suspend_chan;
dw->resume_chan = dw_dma_resume_chan;
dw->encode_maxburst = dw_dma_encode_maxburst;
dw->bytes2block = dw_dma_bytes2block;
dw->block2bytes = dw_dma_block2bytes;

13
drivers/dma/dw/idma32.c
View File

@ -34,12 +34,20 @@ static void idma32_suspend_chan(struct dw_dma_chan *dwc, bool drain)
if (drain)
cfglo |= IDMA32C_CFGL_CH_DRAIN;
else
cfglo &= ~IDMA32C_CFGL_CH_DRAIN;
channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP);
}
static void idma32_resume_chan(struct dw_dma_chan *dwc, bool drain)
{
u32 cfglo = channel_readl(dwc, CFG_LO);
if (drain)
cfglo &= ~IDMA32C_CFGL_CH_DRAIN;
channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
}
static u32 idma32_bytes2block(struct dw_dma_chan *dwc,
size_t bytes, unsigned int width, size_t *len)
{
@ -117,6 +125,7 @@ int idma32_dma_probe(struct dw_dma_chip *chip)
/* Channel operations */
dw->initialize_chan = idma32_initialize_chan;
dw->suspend_chan = idma32_suspend_chan;
dw->resume_chan = idma32_resume_chan;
dw->encode_maxburst = idma32_encode_maxburst;
dw->bytes2block = idma32_bytes2block;
dw->block2bytes = idma32_block2bytes;

1
drivers/dma/dw/regs.h
View File

@ -315,6 +315,7 @@ struct dw_dma {
/* Channel operations */
void (*initialize_chan)(struct dw_dma_chan *dwc);
void (*suspend_chan)(struct dw_dma_chan *dwc, bool drain);
void (*resume_chan)(struct dw_dma_chan *dwc, bool drain);
void (*encode_maxburst)(struct dw_dma_chan *dwc, u32 *maxburst);
u32 (*bytes2block)(struct dw_dma_chan *dwc, size_t bytes,
unsigned int width, size_t *len);