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bcm2835 video: Map fb as cached

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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>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Alexander Graf 2016-03-24 10:31:11 +01:00 committed by Tom Rini
parent ccd9d51ede
commit 99de254e8d
1 changed files with 9 additions and 0 deletions
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9
drivers/video/bcm2835.c
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@ -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)