From 1382648b6bef3921086abeadadbd9fbc54619ab1 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Sat, 6 Feb 2016 10:42:43 -0700 Subject: [PATCH] video: bcm2835: use bus_to_phys() on FB address The FB address is generated by the firmware running on the GPU/VideoCore and is a "bus" address. This address is the other side of an IOMMU from the ARM upon which U-Boot is running. Use bus_to_phys() to convert this to an ARM physical address. Without this, U-Boot seems to work just fine, but once the Linux kernel boots on an RPi2, accessing the FB memory often causes a hard system hang. This is related to: 122426d46e31 ARM: bcm2835: use phys_to_bus() for mbox 5c0beb5c58c8 usb: dwc2: use phys_to_bus/bus_to_phys 79340db7f1f6 ARM: bcm2835: implement phys_to_bus/bus_to_phys Signed-off-by: Stephen Warren --- drivers/video/bcm2835.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/video/bcm2835.c b/drivers/video/bcm2835.c index 7867fe3895..bff1fcb9ea 100644 --- a/drivers/video/bcm2835.c +++ b/drivers/video/bcm2835.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include @@ -103,7 +104,8 @@ void lcd_ctrl_init(void *lcdbase) panel_info.vl_row = h; panel_info.vl_bpix = LCD_COLOR16; - gd->fb_base = msg_setup->allocate_buffer.body.resp.fb_address; + gd->fb_base = bus_to_phys( + msg_setup->allocate_buffer.body.resp.fb_address); } void lcd_enable(void) -- 2.39.5