openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

ARM: imx51: Configure M4IF to avoid visual artifacts 

Configure the M4IF registers as per the vendor bootloader
to avoid visual artifacts during video playback.

This way we don't need to rely on the bootloader configuration for
optimal IPU/VPU bus priorities.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Sergey Lapin <sergey.lapin@cogentembedded.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Fabio Estevam 2018-07-09 15:19:15 -03:00 committed by Shawn Guo
parent bc0ebbd5b5
commit 11d973de60
1 changed files with 28 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
arch/arm/mach-imx/mach-imx51.c
View File

@ -12,6 +12,7 @@
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <asm/mach/arch.h>
@ -48,11 +49,37 @@ static void __init imx51_ipu_mipi_setup(void)
iounmap(hsc_addr);
}
static void __init imx51_m4if_setup(void)
{
void __iomem *m4if_base;
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "fsl,imx51-m4if");
if (!np)
return;
m4if_base = of_iomap(np, 0);
if (!m4if_base) {
pr_err("Unable to map M4IF registers\n");
return;
}
/*
* Configure VPU and IPU with higher priorities
* in order to avoid artifacts during video playback
*/
writel_relaxed(0x00000203, m4if_base + 0x40);
writel_relaxed(0x00000000, m4if_base + 0x44);
writel_relaxed(0x00120125, m4if_base + 0x9c);
writel_relaxed(0x001901A3, m4if_base + 0x48);
iounmap(m4if_base);
}
static void __init imx51_dt_init(void)
{
imx51_ipu_mipi_setup();
imx_src_init();
imx51_m4if_setup();
imx_aips_allow_unprivileged_access("fsl,imx51-aipstz");
}