[U-Boot] [PATCH] Blackfin: shutdown video DMA when booting Linux

[Mike Frysinger]

From: Michael Hennerich <michael.hennerich at 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 at analog.com>
Signed-off-by: Mike Frysinger <vapier at 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())
-- 
1.7.2