[PATCH] drm/ast: Fix incorrect register check for DRAM width

[PATCH] drm/ast: Fix incorrect register check for DRAM width

[Timothy Pearson]

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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[PATCH] drm/ast: Fix incorrect register check for DRAM width

[Timothy Pearson]

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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Re: [PATCH] drm/ast: Fix incorrect register check for DRAM width

[Timothy Pearson]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 02/26/2016 03:29 PM, Timothy Pearson wrote:
> 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;

Just wanted to give this a bump since I have not received any feedback
on it.

Thanks!

- -- 
Timothy Pearson
Raptor Engineering
+1 (415) 727-8645 (direct line)
+1 (512) 690-0200 (switchboard)
http://www.raptorengineeringinc.com
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Re: [PATCH] drm/ast: Fix incorrect register check for DRAM width

[Dave Airlie]

On 2 March 2016 at 04:58, Timothy Pearson
<tpearson@raptorengineeringinc.com> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 02/26/2016 03:29 PM, Timothy Pearson wrote:
>> 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;
>
> Just wanted to give this a bump since I have not received any feedback
> on it.

Thanks,

I've confirmed with the userspace AST driver this is correct, I'll put
this in drm-fixes now.

Dave.
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