[Intel-gfx] [PATCH 1/7] drm: Renaming DP training vswing pre emph defines

[Jindal, Sonika]

On 8/26/2014 4:58 PM, Thierry Reding wrote:
> On Fri, Aug 08, 2014 at 04:23:40PM +0530, sonika.jindal at intel.com wrote:
>> From: Sonika Jindal <sonika.jindal at intel.com>
>>
>> Adding new defines, older one will be removed in the last patch in the series.
>> This is to rename the defines to have levels instead of values for vswing and
>> pre-emph levels as the values may differ in other scenarios like low vswing of
>> eDP1.4 where the values are different.
>>
>> Done using following cocci patch for each define:
>> @@
>> @@
>>
>>   # define DP_TRAIN_VOLTAGE_SWING_400     (0 << 0)
>> + # define DP_TRAIN_VOLTAGE_SWING_LEVEL_0     (0 << 0)
>
> Could this perhaps be simply:
>
> 	#define DP_TRAIN_VOLTAGE_SWING(x) ((x) << 0)
>
> As it is, there's no information about the value within the symbolic
> name anyway, so _LEVEL_* really isn't that useful and keeping several
> macros for each value seems isn't either.
>
I feel _LEVEL_* makes it more readable and since there are only 4 values 
possible, it is ok to have 4 different macros for readability purpose. 
What do you think?
> An alternative would be to provide a second set of defines for eDP 1.4
> where the name implies the meaning and then use them as appropriate.
>
> Thierry
>