From: Timothy Pearson <tpearson@raptorengineeringinc.com>
To: airlied@linux.ie, dri-devel@lists.freedesktop.org
Subject: [PATCH] drm/ast: Fix incorrect register check for DRAM width
Date: Thu, 25 Feb 2016 23:17:04 -0600 [thread overview]
Message-ID: <56CFDFD0.1080901@raptorengineeringinc.com> (raw)
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>
---
drivers/gpu/drm/ast/ast_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 9759009..b1480ac 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;
--
1.7.9.5
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next reply other threads:[~2016-02-26 5:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-26 5:17 Timothy Pearson [this message]
-- strict thread matches above, loose matches on Subject: below --
2016-02-26 21:29 [PATCH] drm/ast: Fix incorrect register check for DRAM width Timothy Pearson
2016-03-01 18:58 ` Timothy Pearson
2016-03-02 7:49 ` Dave Airlie
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