The bcm2835 frame buffer is in RAM, so we can easily map it as cached and gain all the glorious performance boost that brings with it.
Signed-off-by: Alexander Graf agraf@suse.de
---
v2 -> v3:
- Fix align parameters - Fix whitespace
v3 -> v4:
- Align start of fb as well to align with segments - Align fb size on segment size, not page size
v4 -> v5:
- Align fb start down, not up --- drivers/video/bcm2835.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/video/bcm2835.c b/drivers/video/bcm2835.c index bff1fcb..cd605e6 100644 --- a/drivers/video/bcm2835.c +++ b/drivers/video/bcm2835.c @@ -44,6 +44,7 @@ void lcd_ctrl_init(void *lcdbase) ALLOC_CACHE_ALIGN_BUFFER(struct msg_setup, msg_setup, 1); int ret; u32 w, h; + u32 fb_start, fb_end;
debug("bcm2835: Query resolution...\n");
@@ -106,6 +107,14 @@ void lcd_ctrl_init(void *lcdbase)
gd->fb_base = bus_to_phys( msg_setup->allocate_buffer.body.resp.fb_address); + + /* Enable dcache for the frame buffer */ + fb_start = gd->fb_base & ~(MMU_SECTION_SIZE - 1); + fb_end = gd->fb_base + msg_setup->allocate_buffer.body.resp.fb_size; + fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT); + mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start, + DCACHE_WRITEBACK); + lcd_set_flush_dcache(1); }
void lcd_enable(void)