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MLK-17635-2: ASoC: fsl_dsp: fix unhandled alignment fault in user space

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When using memcpy() or fread() function in dsp unit test or wrapper code,
an unhandled alignment fault error will occur randomly, this issue
is caused by the setting of mmap(). After using pgprot_writecombine()
function instead of pgprot_noncached() function, this error will not
occur.

Signed-off-by: Weiguang Kong <weiguang.kong@nxp.com>
This commit is contained in:
Weiguang Kong 2018-03-13 18:40:06 +08:00 committed by Jason Liu
parent 118061cbcd
commit d68008198f
1 changed files with 2 additions and 2 deletions
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4
sound/soc/fsl/fsl_hifi4.c
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@ -532,7 +532,7 @@ static int fsl_hifi4_mmap(struct file *file, struct vm_area_struct *vma)
size = hifi4_priv->scratch_buf_size;
/* ...remap shared memory to user-space */
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
r = remap_pfn_range(vma, vma->vm_start, pfn, size, vma->vm_page_prot);
if (r != 0) {
pr_err("mapping failed: %d", r);
@ -839,7 +839,7 @@ static int fsl_hifi4_probe(struct platform_device *pdev)
}
hifi4_priv->sdram_phys_addr = SDRAM_BASE_ADDR;
hifi4_priv->sdram_vir_addr = ioremap(hifi4_priv->sdram_phys_addr,
hifi4_priv->sdram_vir_addr = ioremap_wc(hifi4_priv->sdram_phys_addr,
SDRAM_BASE_SIZE);
if (!hifi4_priv->sdram_vir_addr) {
dev_err(&pdev->dev, "failed to remap sdram space for hifi4 firmware\n");