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Blackfin: shutdown video DMA when booting Linux

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In case there is no frame buffer driver present in Linux to hand over the
PPI LCD DMA upon boot, the DMA initiated by u-boot to display the splash
screen runs unattended.  Therefore always stop the video driver in u-boot
before starting Linux.  If people don't want this behavior, then they can
simply stub out the video_stop() function in their board video driver.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Michael Hennerich 2009-08-07 02:47:54 +00:00 committed by Mike Frysinger
parent 69a2a4d9a5
commit 5fc564eda7
5 changed files with 38 additions and 0 deletions
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9
arch/blackfin/lib/boot.c
View File

@ -18,6 +18,10 @@
extern void swap_to(int device_id);
#endif
#ifdef CONFIG_VIDEO
extern void video_stop(void);
#endif
static char *make_command_line(void)
{
char *dest = (char *)CONFIG_LINUX_CMDLINE_ADDR;
@ -45,6 +49,11 @@ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *ima
swap_to(FLASH);
#endif
#ifdef CONFIG_VIDEO
/* maybe this should be standardized and moved to bootm ... */
video_stop();
#endif
appl = (int (*)(char *))images->ep;
printf("Starting Kernel at = %p\n", appl);

11
board/bf527-ezkit/video.c
View File

@ -378,6 +378,17 @@ static void dma_bitblit(void *dst, fastimage_t *logo, int x, int y)
}
void video_stop(void)
{
DisablePPI();
DisableDMA();
DisableTIMER0();
DisableTIMER1();
#ifdef CONFIG_MK_BF527_EZKIT_REV_2_1
lq035q1_control(LQ035_SHUT_CTL, LQ035_SHUT);
#endif
}
void video_putc(const char c)
{
}

6
board/bf533-stamp/video.c
View File

@ -150,6 +150,12 @@ static void video_init(char *NTSCFrame)
bfin_write_PPI_CONTROL(0x0083);
}
void video_stop(void)
{
bfin_write_PPI_CONTROL(0);
bfin_write_DMA0_CONFIG(0);
}
int drv_video_init(void)
{
struct stdio_dev videodev;

6
board/bf548-ezkit/video.c
View File

@ -224,6 +224,12 @@ int video_init(void *dst)
return 0;
}
void video_stop(void)
{
DisablePPI();
DisableDMA();
}
static void dma_bitblit(void *dst, fastimage_t *logo, int x, int y)
{
if (dcache_status())

6
board/cm-bf548/video.c
View File

@ -225,6 +225,12 @@ int video_init(void *dst)
return 0;
}
void video_stop(void)
{
DisablePPI();
DisableDMA();
}
static void dma_bitblit(void *dst, fastimage_t *logo, int x, int y)
{
if (dcache_status())