Re: [PATCH v8 2/3] drm/i915/display: Add hook to check optimization support for Intel platforms

["Hogander, Jouni" <jouni.hogander@intel.com>]

On Wed, 2026-03-18 at 14:26 +0530, Animesh Manna wrote:
> Add a hook that uses the drm core tunneling function to check
> whether panel replay bandwidth optimization support is present.
> 
> v2: Move DISPLAY_VER() check to
> intel_dp_tunnel_pr_optimization_supported(). [Jouni]
> 
> Signed-off-by: Animesh Manna <animesh.manna@intel.com>

Reviewed-by: Jouni Högander <jouni.hogander@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_dp_tunnel.c | 18
> ++++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_dp_tunnel.h |  6 ++++++
>  2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_tunnel.c
> b/drivers/gpu/drm/i915/display/intel_dp_tunnel.c
> index 1fd1ac8d556d..b81ac9a2d727 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_tunnel.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_tunnel.c
> @@ -296,6 +296,24 @@ bool intel_dp_tunnel_bw_alloc_is_enabled(struct
> intel_dp *intel_dp)
>  	return drm_dp_tunnel_bw_alloc_is_enabled(intel_dp->tunnel);
>  }
>  
> +/**
> + * intel_dp_tunnel_pr_optimization_supported - Query the PR BW
> optimization support
> + * @intel_dp: DP port object
> + *
> + * Query whether a DP tunnel supports the PR BW optimization.
> + *
> + * Returns %true if the BW allocation mode is supported on
> @intel_dp.
> + */
> +bool intel_dp_tunnel_pr_optimization_supported(struct intel_dp
> *intel_dp)
> +{
> +	struct intel_display *display = to_intel_display(intel_dp);
> +
> +	if (DISPLAY_VER(display) < 35)
> +		return false;
> +
> +	return drm_dp_tunnel_pr_optimization_supported(intel_dp-
> >tunnel);
> +}
> +
>  /**
>   * intel_dp_tunnel_suspend - Suspend a DP tunnel connected on a port
>   * @intel_dp: DP port object
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_tunnel.h
> b/drivers/gpu/drm/i915/display/intel_dp_tunnel.h
> index 7f0f720e8dca..03e147736b65 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_tunnel.h
> +++ b/drivers/gpu/drm/i915/display/intel_dp_tunnel.h
> @@ -32,6 +32,7 @@ void intel_dp_tunnel_resume(struct intel_dp
> *intel_dp,
>  void intel_dp_tunnel_suspend(struct intel_dp *intel_dp);
>  
>  bool intel_dp_tunnel_bw_alloc_is_enabled(struct intel_dp *intel_dp);
> +bool intel_dp_tunnel_pr_optimization_supported(struct intel_dp
> *intel_dp);
>  
>  void
>  intel_dp_tunnel_atomic_cleanup_inherited_state(struct
> intel_atomic_state *state);
> @@ -76,6 +77,11 @@ static inline bool
> intel_dp_tunnel_bw_alloc_is_enabled(struct intel_dp *intel_dp
>  	return false;
>  }
>  
> +static inline bool intel_dp_tunnel_pr_optimization_supported(struct
> intel_dp *intel_dp)
> +{
> +	return false;
> +}
> +
>  static inline void
>  intel_dp_tunnel_atomic_cleanup_inherited_state(struct
> intel_atomic_state *state) {}
>