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Commit c761b583 authored by Jie Yang's avatar Jie Yang Committed by Mark Brown
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ASoC: Intel: Add dummy read for SRAM block enable 



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

Signed-off-by: default avatarJie Yang <yang.jie@intel.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 8e897618

sound/soc/intel/sst-haswell-dsp.c

+13 −0
Original line number Diff line number Diff line
@@ -359,6 +359,17 @@ static u32 hsw_block_get_bit(struct sst_mem_block *block) 
	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 */

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 */

	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;

}