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ASoC: Intel: Add dummy read for SRAM block enable

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Add dummy read after each block enable, to workaround
SRAM write missing bytes issue.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Jie Yang 2014-07-14 17:11:11 +08:00 committed by Mark Brown
parent 8e89761876
commit c761b58306
1 changed files with 13 additions and 0 deletions
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13
sound/soc/intel/sst-haswell-dsp.c
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@ -359,6 +359,17 @@ static u32 hsw_block_get_bit(struct sst_mem_block *block)
return bit; return bit;
} }
/*dummy read a SRAM block.*/
static void sst_mem_block_dummy_read(struct sst_mem_block *block)
{
u32 size;
u8 tmp_buf[4];
struct sst_dsp *sst = block->dsp;
size = block->size > 4 ? 4 : block->size;
memcpy_fromio(tmp_buf, sst->addr.lpe + block->offset, size);
}
/* enable 32kB memory block - locks held by caller */ /* enable 32kB memory block - locks held by caller */
static int hsw_block_enable(struct sst_mem_block *block) static int hsw_block_enable(struct sst_mem_block *block)
{ {
@ -378,6 +389,8 @@ static int hsw_block_enable(struct sst_mem_block *block)
/* wait 18 DSP clock ticks */ /* wait 18 DSP clock ticks */
udelay(10); udelay(10);
/*add a dummy read before the SRAM block is written, otherwise the writing may miss bytes sometimes.*/
sst_mem_block_dummy_read(block);
return 0; return 0;
} }