[Intel-gfx] [PATCH 2/2] drm/i915: vlv/chv: fix DSI sideband register accessing

[Kumar, Shobhit]

On 5/26/2014 6:22 PM, Jani Nikula wrote:
> On Mon, 19 May 2014, Imre Deak <imre.deak at intel.com> wrote:
>> So far we used the wrong opcodes to access the DSI registers, so the
>> register writes during DSI programming didn't actually succeed and left
>> the registers unchanged. This wasn't a problem for the initial modeset,
>> where the BIOS-programmed values happened to work, but after resuming
>> from s0ix these registers are reset and failing to program them results
>> in a blank screen.
>
> Shobhit, this was already merged, did you have a chance to test it?
>

Sorry just saw this today. Yeah I have pulled this in my test tree and 
suspend/resume was working perfect, but then I was not doing display 
powergate. In the internal code though S0ix was implemented. I will 
double check if the internal code had correct opcodes and somehow wrong 
opcodes trickled into intel-gfx. As of now looks okay and works fine for me.

Regards
Shobhit

> Jani.
>
>
>>
>> Signed-off-by: Imre Deak <imre.deak at intel.com>
>> ---
>>   drivers/gpu/drm/i915/intel_sideband.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
>> index f3909d5..01d841e 100644
>> --- a/drivers/gpu/drm/i915/intel_sideband.c
>> +++ b/drivers/gpu/drm/i915/intel_sideband.c
>> @@ -270,13 +270,13 @@ void intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,
>>   u32 vlv_flisdsi_read(struct drm_i915_private *dev_priv, u32 reg)
>>   {
>>   	u32 val = 0;
>> -	vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_MRD_NP,
>> +	vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRRDDA_NP,
>>   			reg, &val);
>>   	return val;
>>   }
>>
>>   void vlv_flisdsi_write(struct drm_i915_private *dev_priv, u32 reg, u32 val)
>>   {
>> -	vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_MWR_NP,
>> +	vlv_sideband_rw(dev_priv, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRWRDA_NP,
>>   			reg, &val);
>>   }
>> --
>> 1.8.4
>>
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>