Blackfin: shutdown video DMA when booting Linux
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>
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 @@
}
+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)
{
}