evie/android_kernel_oneplus_msm8998
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msm: mdss: debugfs: xlog: fix xlog corruption in ramdump

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Display driver debug feature xlog, allocates some memory
to copy some of the MDP registers that are needed for
debugging and then it panics. Current memory allocation
api has a problem, where data from this memory allocation
is shown corrupted in the ramdump.
This change workaround this problem by changing the
memory allocation to a dma alloc which works fine
to keep the data correct in the ramdump.

Change-Id: I391419095fb7ebfd3eb88faf26d2b473c255f28c
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>
This commit is contained in:
Ingrid Gallardo 2015-01-21 17:20:09 -08:00 • committed by David Keitel
parent 172cc23834
commit ee6e565bcc
1 changed files with 5 additions and 1 deletions
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6
drivers/video/fbdev/msm/mdss_debug_xlog.c
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@ -16,6 +16,7 @@
#include <linux/ktime.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/dma-buf.h>
#include "mdss.h"
#include "mdss_mdp.h"
@ -205,8 +206,10 @@ u32 get_dump_range(struct dump_offset *range_node, size_t max_offset)
static void mdss_dump_reg(u32 reg_dump_flag,
char *addr, int len, u32 *dump_mem)
{
struct mdss_data_type *mdata = mdss_mdp_get_mdata();
bool in_log, in_mem;
u32 *dump_addr = NULL;
phys_addr_t phys = 0;
int i;
in_log = (reg_dump_flag & MDSS_REG_DUMP_IN_LOG);
@ -221,7 +224,8 @@ static void mdss_dump_reg(u32 reg_dump_flag,
if (in_mem) {
if (!dump_mem)
dump_mem = kzalloc(len * 16, GFP_KERNEL);
dump_mem = dma_alloc_coherent(&mdata->pdev->dev,
len * 16, &phys, GFP_KERNEL);
if (dump_mem) {
dump_addr = dump_mem;