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

[Vivi, Rodrigo]

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..

> 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)
>