From: Michael Hennerich michael.hennerich@analog.com
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 --- arch/blackfin/lib/boot.c | 9 +++++++++ board/bf527-ezkit/video.c | 11 +++++++++++ board/bf533-stamp/video.c | 6 ++++++ board/bf548-ezkit/video.c | 6 ++++++ board/cm-bf548/video.c | 6 ++++++ 5 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/arch/blackfin/lib/boot.c b/arch/blackfin/lib/boot.c index 37aa82a..768a882 100644 --- a/arch/blackfin/lib/boot.c +++ b/arch/blackfin/lib/boot.c @@ -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); diff --git a/board/bf527-ezkit/video.c b/board/bf527-ezkit/video.c index 891070b..51bdf02 100644 --- a/board/bf527-ezkit/video.c +++ b/board/bf527-ezkit/video.c @@ -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) { } diff --git a/board/bf533-stamp/video.c b/board/bf533-stamp/video.c index 939bd35..75b8adc 100644 --- a/board/bf533-stamp/video.c +++ b/board/bf533-stamp/video.c @@ -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; diff --git a/board/bf548-ezkit/video.c b/board/bf548-ezkit/video.c index af3d58b..cde877a 100644 --- a/board/bf548-ezkit/video.c +++ b/board/bf548-ezkit/video.c @@ -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()) diff --git a/board/cm-bf548/video.c b/board/cm-bf548/video.c index d43f5a1..c501697 100644 --- a/board/cm-bf548/video.c +++ b/board/cm-bf548/video.c @@ -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())