[Intel-gfx] [PATCH 7/8] drm/i915/skl: Add boot parameter for disabling DC6

[Patrik Jakobsson]

On Tue, Nov 3, 2015 at 3:19 PM, Jani Nikula <jani.nikula at linux.intel.com> wrote:
> On Tue, 03 Nov 2015, Patrik Jakobsson <patrik.jakobsson at linux.intel.com> wrote:
>> On Tue, Nov 03, 2015 at 03:08:41PM +0200, Jani Nikula wrote:
>>> On Tue, 03 Nov 2015, Patrik Jakobsson <patrik.jakobsson at linux.intel.com> wrote:
>>> > Signed-off-by: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
>>> > ---
>>> >  drivers/gpu/drm/i915/i915_drv.h         | 1 +
>>> >  drivers/gpu/drm/i915/i915_params.c      | 6 ++++++
>>> >  drivers/gpu/drm/i915/intel_runtime_pm.c | 2 +-
>>> >  3 files changed, 8 insertions(+), 1 deletion(-)
>>> >
>>> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
>>> > index efb6a00..9c8cb43 100644
>>> > --- a/drivers/gpu/drm/i915/i915_drv.h
>>> > +++ b/drivers/gpu/drm/i915/i915_drv.h
>>> > @@ -2660,6 +2660,7 @@ struct i915_params {
>>> >    int panel_use_ssc;
>>> >    int vbt_sdvo_panel_type;
>>> >    int enable_rc6;
>>> > +  int enable_dc6;
>>> >    int enable_fbc;
>>> >    int enable_ppgtt;
>>> >    int enable_execlists;
>>> > diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
>>> > index 368df67..1a7dedf 100644
>>> > --- a/drivers/gpu/drm/i915/i915_params.c
>>> > +++ b/drivers/gpu/drm/i915/i915_params.c
>>> > @@ -32,6 +32,7 @@ struct i915_params i915 __read_mostly = {
>>> >    .panel_use_ssc = -1,
>>> >    .vbt_sdvo_panel_type = -1,
>>> >    .enable_rc6 = -1,
>>> > +  .enable_dc6 = 1,
>>> >    .enable_fbc = -1,
>>> >    .enable_execlists = -1,
>>> >    .enable_hangcheck = true,
>>> > @@ -79,6 +80,11 @@ MODULE_PARM_DESC(enable_rc6,
>>> >    "For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. "
>>> >    "default: -1 (use per-chip default)");
>>> >
>>> > +module_param_named(enable_dc6, i915.enable_dc6, int, 0400);
>>>
>>> _unsafe please.
>>
>> Is the convention to taint for all non-default options in i915?
>
> The intention is to taint all i915 options that people have no clue
> about and blindly set just because they read on a forum they should do
> it, and then report bugs because it fails.

This one certainly fits that description. Thanks for the explanation.

-Patrik

>
> BR,
> Jani.
>
>
>
>>
>> -Patrik
>>
>>>
>>> BR,
>>> Jani.
>>>
>>> > +MODULE_PARM_DESC(enable_dc6,
>>> > +  "Enable power-saving display C-state 6. "
>>> > +  "(0 = disable; 1 = enable [default])");
>>> > +
>>> >  module_param_named_unsafe(enable_fbc, i915.enable_fbc, int, 0600);
>>> >  MODULE_PARM_DESC(enable_fbc,
>>> >    "Enable frame buffer compression for power savings "
>>> > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
>>> > index 042d92f..4843c5c 100644
>>> > --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
>>> > +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
>>> > @@ -753,7 +753,7 @@ static void skl_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
>>> >  static void skl_dc_off_power_well_disable(struct drm_i915_private *dev_priv,
>>> >                                      struct i915_power_well *power_well)
>>> >  {
>>> > -  if (IS_SKYLAKE(dev_priv))
>>> > +  if (IS_SKYLAKE(dev_priv) && i915.enable_dc6)
>>> >            skl_enable_dc6(dev_priv);
>>> >    else
>>> >            gen9_enable_dc5(dev_priv);
>>>
>>> --
>>> Jani Nikula, Intel Open Source Technology Center
>
> --
> Jani Nikula, Intel Open Source Technology Center
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