diff mbox

drm/radeon: fix logic error in atombios_encoders.c

Message ID 1352902387-31133-1-git-send-email-alexdeucher@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Alex Deucher Nov. 14, 2012, 2:13 p.m. UTC
From: Alex Deucher <alexander.deucher@amd.com>

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=50431

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
---
 drivers/gpu/drm/radeon/atombios_encoders.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Comments

Michel Dänzer Nov. 14, 2012, 2:32 p.m. UTC | #1
On Mit, 2012-11-14 at 09:13 -0500, alexdeucher@gmail.com wrote: 
> From: Alex Deucher <alexander.deucher@amd.com>
> 
> Fixes:
> https://bugzilla.kernel.org/show_bug.cgi?id=50431
> 
> Reported-by: David Binderman <dcb314@hotmail.com>
> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> Cc: stable@vger.kernel.org

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>


>  drivers/gpu/drm/radeon/atombios_encoders.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
> index ba498f8..010bae1 100644
> --- a/drivers/gpu/drm/radeon/atombios_encoders.c
> +++ b/drivers/gpu/drm/radeon/atombios_encoders.c
> @@ -1625,7 +1625,7 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode)
>  			atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_SETUP, 0, 0);
>  			atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE, 0, 0);
>  			/* some early dce3.2 boards have a bug in their transmitter control table */
> -			if ((rdev->family != CHIP_RV710) || (rdev->family != CHIP_RV730))
> +			if ((rdev->family != CHIP_RV710) && (rdev->family != CHIP_RV730))

Ouch, the compiler didn't warn about this always evaluating to true?
Alex Deucher Nov. 14, 2012, 2:37 p.m. UTC | #2
On Wed, Nov 14, 2012 at 9:32 AM, Michel Dänzer <michel@daenzer.net> wrote:
> On Mit, 2012-11-14 at 09:13 -0500, alexdeucher@gmail.com wrote:
>> From: Alex Deucher <alexander.deucher@amd.com>
>>
>> Fixes:
>> https://bugzilla.kernel.org/show_bug.cgi?id=50431
>>
>> Reported-by: David Binderman <dcb314@hotmail.com>
>> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
>> Cc: stable@vger.kernel.org
>
> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
>
>
>>  drivers/gpu/drm/radeon/atombios_encoders.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
>> index ba498f8..010bae1 100644
>> --- a/drivers/gpu/drm/radeon/atombios_encoders.c
>> +++ b/drivers/gpu/drm/radeon/atombios_encoders.c
>> @@ -1625,7 +1625,7 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode)
>>                       atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_SETUP, 0, 0);
>>                       atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE, 0, 0);
>>                       /* some early dce3.2 boards have a bug in their transmitter control table */
>> -                     if ((rdev->family != CHIP_RV710) || (rdev->family != CHIP_RV730))
>> +                     if ((rdev->family != CHIP_RV710) && (rdev->family != CHIP_RV730))
>
> Ouch, the compiler didn't warn about this always evaluating to true?

Nope.  At least not on any of my machines.

>
>
> --
> Earthling Michel Dänzer           |                   http://www.amd.com
> Libre software enthusiast         |          Debian, X and DRI developer
diff mbox

Patch

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index ba498f8..010bae1 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -1625,7 +1625,7 @@  radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode)
 			atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_SETUP, 0, 0);
 			atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE, 0, 0);
 			/* some early dce3.2 boards have a bug in their transmitter control table */
-			if ((rdev->family != CHIP_RV710) || (rdev->family != CHIP_RV730))
+			if ((rdev->family != CHIP_RV710) && (rdev->family != CHIP_RV730))
 				atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE_OUTPUT, 0, 0);
 		}
 		if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(encoder)) && connector) {