xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARM: shmobile: r8a7740: add MERAM work-around

Browse Source 
r8a7740 chip has lasting errata on MERAM buffer, and this patch adds
its work-around on setup-r8a7740.c
It solved CEU/VIO6C/2D-DMAC/VCP1/VPU5F/JPU/DISP memroy access error.

But MERAM driver can't control this issue,
since this work-around requires access to non-MERAM register address.
So, This it will be called as board specific code at this point.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Simon Horman <horms@verge.net.au>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Kuninori Morimoto
2012-06-12 02:36:21 -07:00
committed by Rafael J. Wysocki
parent e2dcd461a7
commit d49679e592
3 changed files with 20 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
arch/arm/mach-shmobile/setup-r8a7740.c
View File

@@ -324,6 +324,24 @@ static struct platform_device *r8a7740_late_devices[] __initdata = {
&i2c1_device,
};
/*
* r8a7740 chip has lasting errata on MERAM buffer.
* this is work-around for it.
* see
* "Media RAM (MERAM)" on r8a7740 documentation
*/
#define MEBUFCNTR 0xFE950098
void r8a7740_meram_workaround(void)
{
void __iomem *reg;
reg = ioremap_nocache(MEBUFCNTR, 4);
if (reg) {
iowrite32(0x01600164, reg);
iounmap(reg);
}
}
#define ICCR 0x0004
#define ICSTART 0x0070