diff options
| author | Xinyu Chen <xinyu.chen@freescale.com> | 2010-11-02 13:45:08 +0800 |
|---|---|---|
| committer | Xinyu Chen <xinyu.chen@freescale.com> | 2012-02-02 16:59:07 +0800 |
| commit | d5caa405118236b2829e873e1b61a8ae34a29456 (patch) | |
| tree | f9e28543f1571ffea5aba2215e54ebdd5e744ca8 /drivers | |
| parent | 599a980adc5c2ba32f6aedcd87640b781d347d1f (diff) | |
ENGR00133687 Android pmem: change the noncached buffer prot to writecombine.
Workaround for imx5x M4IF burst len errata when armv7 neon enabled:
if the burst len > 8bytes, access the strongly ordered memory,
the result is not correct.
Use pgprot_writecombine to map the memory to uncached and normal memory type,
instead of pgprot_noncached which maps to strongly ordered memory,
to avoid burst len > 8.
Signed-off-by: Hu Hui <b29976@freescale.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/misc/pmem.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/misc/pmem.c b/drivers/misc/pmem.c index abb73c143164..bfce8996121a 100644 --- a/drivers/misc/pmem.c +++ b/drivers/misc/pmem.c @@ -1,6 +1,7 @@ /* drivers/android/pmem.c * * Copyright (C) 2007 Google, Inc. + * Copyright (C) 2011 Freescale Semiconductor, Inc. * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and @@ -442,9 +443,9 @@ static int pmem_allocate(int id, unsigned long len) static pgprot_t pmem_access_prot(struct file *file, pgprot_t vma_prot) { int id = get_id(file); -#ifdef pgprot_noncached +#ifdef pgprot_writecombine if (pmem[id].cached == 0 || file->f_flags & O_SYNC) - return pgprot_noncached(vma_prot); + return pgprot_writecombine(vma_prot); #endif #ifdef pgprot_ext_buffered else if (pmem[id].buffered) |