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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: edk2-devel@lists.01.org, leif.lindholm@linaro.org, jeremy.linton@arm.com
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [PATCH 2/2] ArmPlatformPkg/PL111LcdArmVExpressLib: use write-combine mapping for VRAM
Date: Wed,  5 Apr 2017 21:38:33 +0100	[thread overview]
Message-ID: <1491424713-5203-2-git-send-email-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <1491424713-5203-1-git-send-email-ard.biesheuvel@linaro.org>

Replace the uncached memory mapping of the framebuffer with a write-
combining one. This improves performance, and avoids issues with
unaligned accesses and DC ZVA instructions performed by the accelerated
memcpy/memset routines.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 ArmPlatformPkg/ArmVExpressPkg/Library/PL111LcdArmVExpressLib/PL111LcdArmVExpress.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ArmPlatformPkg/ArmVExpressPkg/Library/PL111LcdArmVExpressLib/PL111LcdArmVExpress.c b/ArmPlatformPkg/ArmVExpressPkg/Library/PL111LcdArmVExpressLib/PL111LcdArmVExpress.c
index 2000c9bdf436..d18d6b3e1665 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/Library/PL111LcdArmVExpressLib/PL111LcdArmVExpress.c
+++ b/ArmPlatformPkg/ArmVExpressPkg/Library/PL111LcdArmVExpressLib/PL111LcdArmVExpress.c
@@ -192,7 +192,7 @@ LcdPlatformGetVram (
     ASSERT_EFI_ERROR(Status);
 
     // Mark the VRAM as un-cachable. The VRAM is inside the DRAM, which is cachable.
-    Status = Cpu->SetMemoryAttributes(Cpu, *VramBaseAddress, *VramSize, EFI_MEMORY_UC);
+    Status = Cpu->SetMemoryAttributes(Cpu, *VramBaseAddress, *VramSize, EFI_MEMORY_WC);
     ASSERT_EFI_ERROR(Status);
     if (EFI_ERROR(Status)) {
       gBS->FreePool(VramBaseAddress);
-- 
2.7.4



  reply	other threads:[~2017-04-05 20:38 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-05 20:38 [PATCH 1/2] ArmPlatformPkg/HdLcdArmVExpressLib: use write-combine mapping for VRAM Ard Biesheuvel
2017-04-05 20:38 ` Ard Biesheuvel [this message]
2017-04-06 11:14   ` [PATCH 2/2] ArmPlatformPkg/PL111LcdArmVExpressLib: " Ryan Harkin
2017-04-06 11:32     ` Ard Biesheuvel
2017-04-06 11:43       ` Ryan Harkin
2017-04-06  9:37 ` [PATCH 1/2] ArmPlatformPkg/HdLcdArmVExpressLib: " Leif Lindholm
2017-04-06 10:40   ` Ard Biesheuvel
2017-04-06 11:15     ` Ryan Harkin

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