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[U-Boot,v3,5/5] bcm2835 video: Map fb as cached

Message ID 1458660162-229256-1-git-send-email-agraf@suse.de
State Superseded
Delegated to: Tom Rini
Headers show

Commit Message

Alexander Graf March 22, 2016, 3:22 p.m. UTC 
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
---
 drivers/video/bcm2835.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/drivers/video/bcm2835.c b/drivers/video/bcm2835.c
index bff1fcb..7c99e2d 100644
--- a/drivers/video/bcm2835.c
+++ b/drivers/video/bcm2835.c
@@ -106,6 +106,12 @@  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 */
+	mmu_set_region_dcache_behaviour(gd->fb_base,
+		ALIGN(msg_setup->allocate_buffer.body.resp.fb_size, PAGE_SIZE),
+		DCACHE_WRITEBACK);
+	lcd_set_flush_dcache(1);
 }
 
 void lcd_enable(void)