[U-Boot] [PATCH v5 039/101] x86: Set up the MTRR for SDRAM

[Simon Glass]

Set up MTRRs for the FSP SDRAM regions to improve performance.

Signed-off-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
---

Changes in v5:
- Fix FST typo

Changes in v4: None
Changes in v3:
- Move mtrr_add_request() call into this patch

Changes in v2: None

 arch/x86/lib/fsp/fsp_dram.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
index 3ede9b73fe..9ca898a0cd 100644
--- a/arch/x86/lib/fsp/fsp_dram.c
+++ b/arch/x86/lib/fsp/fsp_dram.c
@@ -8,6 +8,7 @@
 #include <asm/fsp/fsp_support.h>
 #include <asm/e820.h>
 #include <asm/mrccache.h>
+#include <asm/mtrr.h>
 #include <asm/post.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -60,6 +61,8 @@ int dram_init_banksize(void)
 
 		gd->bd->bi_dram[bank].start = res_desc->phys_start;
 		gd->bd->bi_dram[bank].size = res_desc->len;
+		mtrr_add_request(MTRR_TYPE_WRBACK, res_desc->phys_start,
+				 res_desc->len);
 		log_debug("ram %llx %llx\n", gd->bd->bi_dram[bank].start,
 			  gd->bd->bi_dram[bank].size);
 	}
@@ -68,6 +71,8 @@ int dram_init_banksize(void)
 	gd->bd->bi_dram[0].start = 0;
 	gd->bd->bi_dram[0].size = low_end;
 
+	mtrr_add_request(MTRR_TYPE_WRBACK, 0, low_end);
+
 	return 0;
 }
 
-- 
2.24.0.432.g9d3f5f5b63-goog