linux-kernel - [PATCH 1/3] viafb: use write combining for video ram

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Message-Id: <1304173086-3434-2-git-send-email-FlorianSchandinat@gmx.de>
Date:	Sat, 30 Apr 2011 14:18:04 +0000
From:	Florian Tobias Schandinat <FlorianSchandinat@....de>
To:	linux-fbdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [PATCH 1/3] viafb: use write combining for video ram

This can give a speed up of factor 6-9, which is quite notable.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@....de>
---
 drivers/video/via/via-core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/video/via/via-core.c b/drivers/video/via/via-core.c
index 6723d69..5b0129b 100644
--- a/drivers/video/via/via-core.c
+++ b/drivers/video/via/via-core.c
@@ -505,7 +505,7 @@ static int __devinit via_pci_setup_mmio(struct viafb_dev *vdev)
 	ret = vdev->fbmem_len = viafb_get_fb_size_from_pci(vdev->chip_type);
 	if (ret < 0)
 		goto out_unmap;
-	vdev->fbmem = ioremap_nocache(vdev->fbmem_start, vdev->fbmem_len);
+	vdev->fbmem = ioremap_wc(vdev->fbmem_start, vdev->fbmem_len);
 	if (vdev->fbmem == NULL) {
 		ret = -ENOMEM;
 		goto out_unmap;
-- 
1.6.3.2

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