From: Timothy Pearson <tpearson@raptorengineeringinc.com>
Date: Fri, 26 Feb 2016 21:29:32 +0000 (-0600)
Subject: drm/ast: Fix incorrect register check for DRAM width
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2d02b8bdba322b527c5f5168ce1ca10c2d982a78;p=linux.git

drm/ast: Fix incorrect register check for DRAM width

During DRAM initialization on certain ASpeed devices, an incorrect
bit (bit 10) was checked in the "SDRAM Bus Width Status" register
to determine DRAM width.

Query bit 6 instead in accordance with the Aspeed AST2050 datasheet v1.05.

Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 9759009d1da36..b1480acbb3c35 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -227,7 +227,7 @@ static int ast_get_dram_info(struct drm_device *dev)
 	} while (ast_read32(ast, 0x10000) != 0x01);
 	data = ast_read32(ast, 0x10004);
 
-	if (data & 0x400)
+	if (data & 0x40)
 		ast->dram_bus_width = 16;
 	else
 		ast->dram_bus_width = 32;