Re: [PATCH] drm/i915/display: Drop redundant debug print

[Jani Nikula <jani.nikula@intel.com>]

On Mon, 16 Aug 2021, "Sharma, Swati2" <swati2.sharma@intel.com> wrote:
> On 16-Aug-21 5:40 PM, Jani Nikula wrote:
>> On Mon, 16 Aug 2021, "Sharma, Swati2" <swati2.sharma@intel.com> wrote:
>>> On 13-Aug-21 1:16 PM, Jani Nikula wrote:
>>>> On Thu, 12 Aug 2021, Swati Sharma <swati2.sharma@intel.com> wrote:
>>>>> drm_dp_dpcd_read/write already has debug error message.
>>>>> Drop redundant error messages which gives false
>>>>> status even if correct value is read in drm_dp_dpcd_read().
>>>>
>>>> I guess the only problem is it gets harder to associate the preceding
>>>> low level error messages with intel_dp_check_link_service_irq(). *shrug*
>>>>
>>>> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
>>>>
>>>>
>>> Thanks Jani for the review. Can you please merge?
>> 
>> There was another version with open review?
>
> Yes. https://patchwork.freedesktop.org/series/93025/#rev3
> Should I add debug prints how Imre suggested in other IRQ func
> to make it generic or should it be dropped from here too?
> Quoting imre
> "Yes, that's why I suggested to return for the '0 value read' case 
> without any message printed, but still keep the message for the case 
> when the drm_dp_dpcd_readb() fails."
> "Ok, it's good to keep them in sync at least, so I'm ok with removing 
> the debug messages from here too."
>
> Please let me know what is the better approach.

IMO just nuke them.

BR,
Jani



>> 
>> BR,
>> Jani.
>> 
>> 
>>>
>>>>>
>>>>> Fixes: 9488a030ac91 ("drm/i915: Add support for enabling link status and recovery")
>>>>> Cc: Swati Sharma <swati2.sharma@intel.com>
>>>>> Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
>>>>> Cc: Uma Shankar <uma.shankar@intel.com> (v2)
>>>>> Cc: Jani Nikula <jani.nikula@intel.com>
>>>>> Cc: "Ville Syrj_l_" <ville.syrjala@linux.intel.com>
>>>>> Cc: Imre Deak <imre.deak@intel.com>
>>>>> Cc: Manasi Navare <manasi.d.navare@intel.com>
>>>>> Cc: Uma Shankar <uma.shankar@intel.com>
>>>>> Cc: "Jos_ Roberto de Souza" <jose.souza@intel.com>
>>>>> Cc: Sean Paul <seanpaul@chromium.org>
>>>>> Cc: <stable@vger.kernel.org> # v5.12+
>>>>>
>>>>> Link: https://patchwork.freedesktop.org/patch/msgid/20201218103723.30844-12-ankit.k.nautiyal@intel.com
>>>>> Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
>>>>> ---
>>>>>    drivers/gpu/drm/i915/display/intel_dp.c | 8 ++------
>>>>>    1 file changed, 2 insertions(+), 6 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
>>>>> index c386ef8eb200..5c84f51ad41d 100644
>>>>> --- a/drivers/gpu/drm/i915/display/intel_dp.c
>>>>> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
>>>>> @@ -3871,16 +3871,12 @@ static void intel_dp_check_link_service_irq(struct intel_dp *intel_dp)
>>>>>    		return;
>>>>>    
>>>>>    	if (drm_dp_dpcd_readb(&intel_dp->aux,
>>>>> -			      DP_LINK_SERVICE_IRQ_VECTOR_ESI0, &val) != 1 || !val) {
>>>>> -		drm_dbg_kms(&i915->drm, "Error in reading link service irq vector\n");
>>>>> +			      DP_LINK_SERVICE_IRQ_VECTOR_ESI0, &val) != 1 || !val)
>>>>>    		return;
>>>>> -	}
>>>>>    
>>>>>    	if (drm_dp_dpcd_writeb(&intel_dp->aux,
>>>>> -			       DP_LINK_SERVICE_IRQ_VECTOR_ESI0, val) != 1) {
>>>>> -		drm_dbg_kms(&i915->drm, "Error in writing link service irq vector\n");
>>>>> +			       DP_LINK_SERVICE_IRQ_VECTOR_ESI0, val) != 1)
>>>>>    		return;
>>>>> -	}
>>>>>    
>>>>>    	if (val & HDMI_LINK_STATUS_CHANGED)
>>>>>    		intel_dp_handle_hdmi_link_status_change(intel_dp);
>>>>
>> 

-- 
Jani Nikula, Intel Open Source Graphics Center