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 <ag...@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)
--
1.8.5.6
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