[PATCH v3] drm/i915/mtl: Enable Idle Messaging for GSC CS

[Vivi, Rodrigo]

On Sat, 2022-11-19 at 09:02 +0530, Nilawar, Badal wrote:
> 
> 
> On 19-11-2022 00:07, Vivi, Rodrigo wrote:
> > On Sat, 2022-11-19 at 00:03 +0530, Badal Nilawar wrote:
> > > From: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
> > > 
> > > By defaut idle messaging is disabled for GSC CS so to unblock RC6
> > > entry on media tile idle messaging need to be enabled.
> > > 
> > > v2:
> > >   - Fix review comments (Vinay)
> > >   - Set GSC idle hysteresis as per spec (Badal)
> > > v3:
> > >   - Fix review comments (Rodrigo)
> > > 
> > > Bspec: 71496
> > > 
> > > Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> > > Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
> > > Signed-off-by: Badal Nilawar <badal.nilawar at intel.com>
> > > Reviewed-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
> > 
> > He is the author of the patch, no?!
> > or you can remove this or change the author to be you and keep his
> > reviewed-by...
> > 
> > or I can just remove his rv-b while merging.. just let me know..
> As he is original author I will prefer not to change it. You can
> remove 
> his rv-b while merging.

Thanks and pushed.

> 
> Regards,
> Badal
> > 
> > > Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > > ---
> > >   drivers/gpu/drm/i915/gt/intel_engine_pm.c | 18
> > > ++++++++++++++++++
> > >   drivers/gpu/drm/i915/gt/intel_gt_regs.h   |  4 ++++
> > >   2 files changed, 22 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
> > > b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
> > > index b0a4a2dbe3ee..e971b153fda9 100644
> > > --- a/drivers/gpu/drm/i915/gt/intel_engine_pm.c
> > > +++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.c
> > > @@ -15,6 +15,22 @@
> > >   #include "intel_rc6.h"
> > >   #include "intel_ring.h"
> > >   #include "shmem_utils.h"
> > > +#include "intel_gt_regs.h"
> > > +
> > > +static void intel_gsc_idle_msg_enable(struct intel_engine_cs
> > > *engine)
> > > +{
> > > +       struct drm_i915_private *i915 = engine->i915;
> > > +
> > > +       if (IS_METEORLAKE(i915) && engine->id == GSC0) {
> > > +               intel_uncore_write(engine->gt->uncore,
> > > +                                  RC_PSMI_CTRL_GSCCS,
> > > +
> > > _MASKED_BIT_DISABLE(IDLE_MSG_DISABLE));
> > > +               /* hysteresis 0xA=5us as recommended in spec*/
> > > +               intel_uncore_write(engine->gt->uncore,
> > > +                                  PWRCTX_MAXCNT_GSCCS,
> > > +                                  0xA);
> > > +       }
> > > +}
> > >   
> > >   static void dbg_poison_ce(struct intel_context *ce)
> > >   {
> > > @@ -275,6 +291,8 @@ void intel_engine_init__pm(struct
> > > intel_engine_cs
> > > *engine)
> > >   
> > >          intel_wakeref_init(&engine->wakeref, rpm, &wf_ops);
> > >          intel_engine_init_heartbeat(engine);
> > > +
> > > +       intel_gsc_idle_msg_enable(engine);
> > >   }
> > >   
> > >   /**
> > > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > > b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > > index c3cd92691795..80a979e6f6be 100644
> > > --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > > +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > > @@ -917,6 +917,10 @@
> > >   #define  MSG_IDLE_FW_MASK      REG_GENMASK(13, 9)
> > >   #define  MSG_IDLE_FW_SHIFT     9
> > >   
> > > +#define        RC_PSMI_CTRL_GSCCS      _MMIO(0x11a050)
> > > +#define          IDLE_MSG_DISABLE      REG_BIT(0)
> > > +#define        PWRCTX_MAXCNT_GSCCS     _MMIO(0x11a054)
> > > +
> > >   #define FORCEWAKE_MEDIA_GEN9                   _MMIO(0xa270)
> > >   #define FORCEWAKE_RENDER_GEN9                  _MMIO(0xa278)
> > >   
> >