Re: [PATCH 12/19] drm/i915/dp: Add DP tunnel atomic state and check BW limit

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Jan 23, 2024 at 12:28:43PM +0200, Imre Deak wrote:
> Add the atomic state during a modeset required to enable the DP tunnel
> BW allocation mode on links where such a tunnel was detected.
> 
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_atomic.c  |  8 ++++++++
>  drivers/gpu/drm/i915/display/intel_display.c | 19 +++++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_link_bw.c |  5 +++++
>  3 files changed, 32 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
> index 96ab37e158995..4236740ede9ed 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> @@ -260,6 +260,10 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
>  	if (crtc_state->post_csc_lut)
>  		drm_property_blob_get(crtc_state->post_csc_lut);
>  
> +	if (crtc_state->dp_tunnel_ref.tunnel)
> +		drm_dp_tunnel_ref_get(old_crtc_state->dp_tunnel_ref.tunnel,

I'd probably s/old_crtc_state/crtc_state/ here. Same pointer, but
looks out of place given everyone else just operates on 'crtc_state' 
here.

> +					&crtc_state->dp_tunnel_ref);

Shame we have to have this ref wrapper. But I guess no clean
way to have a magic tracked pointer type that works like a
normal pointer in C...

> +
>  	crtc_state->update_pipe = false;
>  	crtc_state->update_m_n = false;
>  	crtc_state->update_lrr = false;
> @@ -311,6 +315,8 @@ intel_crtc_destroy_state(struct drm_crtc *crtc,
>  
>  	__drm_atomic_helper_crtc_destroy_state(&crtc_state->uapi);
>  	intel_crtc_free_hw_state(crtc_state);
> +	if (crtc_state->dp_tunnel_ref.tunnel)
> +		drm_dp_tunnel_ref_put(&crtc_state->dp_tunnel_ref);
>  	kfree(crtc_state);
>  }
>  
> @@ -346,6 +352,8 @@ void intel_atomic_state_clear(struct drm_atomic_state *s)
>  	/* state->internal not reset on purpose */
>  
>  	state->dpll_set = state->modeset = false;
> +
> +	intel_dp_tunnel_atomic_cleanup_inherited_state(state);

This seems to be in the wrong patch?

>  }
>  
>  struct intel_crtc_state *
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index b9f985a5e705b..46b27a32c8640 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -33,6 +33,7 @@
>  #include <linux/string_helpers.h>
>  
>  #include <drm/display/drm_dp_helper.h>
> +#include <drm/display/drm_dp_tunnel.h>
>  #include <drm/drm_atomic.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_atomic_uapi.h>
> @@ -73,6 +74,7 @@
>  #include "intel_dp.h"
>  #include "intel_dp_link_training.h"
>  #include "intel_dp_mst.h"
> +#include "intel_dp_tunnel.h"
>  #include "intel_dpll.h"
>  #include "intel_dpll_mgr.h"
>  #include "intel_dpt.h"
> @@ -4490,6 +4492,8 @@ copy_bigjoiner_crtc_state_modeset(struct intel_atomic_state *state,
>  	saved_state->crc_enabled = slave_crtc_state->crc_enabled;
>  
>  	intel_crtc_free_hw_state(slave_crtc_state);
> +	if (slave_crtc_state->dp_tunnel_ref.tunnel)
> +		drm_dp_tunnel_ref_put(&slave_crtc_state->dp_tunnel_ref);
>  	memcpy(slave_crtc_state, saved_state, sizeof(*slave_crtc_state));
>  	kfree(saved_state);
>  
> @@ -4505,6 +4509,10 @@ copy_bigjoiner_crtc_state_modeset(struct intel_atomic_state *state,
>  		      &master_crtc_state->hw.adjusted_mode);
>  	slave_crtc_state->hw.scaling_filter = master_crtc_state->hw.scaling_filter;
>  
> +	if (master_crtc_state->dp_tunnel_ref.tunnel)
> +		drm_dp_tunnel_ref_get(master_crtc_state->dp_tunnel_ref.tunnel,
> +					&slave_crtc_state->dp_tunnel_ref);
> +
>  	copy_bigjoiner_crtc_state_nomodeset(state, slave_crtc);
>  
>  	slave_crtc_state->uapi.mode_changed = master_crtc_state->uapi.mode_changed;
> @@ -4533,6 +4541,13 @@ intel_crtc_prepare_cleared_state(struct intel_atomic_state *state,
>  	/* free the old crtc_state->hw members */
>  	intel_crtc_free_hw_state(crtc_state);
>  
> +	if (crtc_state->dp_tunnel_ref.tunnel) {
> +		drm_dp_tunnel_atomic_set_stream_bw(&state->base,
> +						   crtc_state->dp_tunnel_ref.tunnel,
> +						   crtc->pipe, 0);
> +		drm_dp_tunnel_ref_put(&crtc_state->dp_tunnel_ref);
> +	}
> +
>  	/* FIXME: before the switch to atomic started, a new pipe_config was
>  	 * kzalloc'd. Code that depends on any field being zero should be
>  	 * fixed, so that the crtc_state can be safely duplicated. For now,
> @@ -5374,6 +5389,10 @@ static int intel_modeset_pipe(struct intel_atomic_state *state,
>  	if (ret)
>  		return ret;
>  
> +	ret = intel_dp_tunnel_atomic_add_state_for_crtc(state, crtc);
> +	if (ret)
> +		return ret;
> +
>  	ret = intel_dp_mst_add_topology_state_for_crtc(state, crtc);
>  	if (ret)
>  		return ret;
> diff --git a/drivers/gpu/drm/i915/display/intel_link_bw.c b/drivers/gpu/drm/i915/display/intel_link_bw.c
> index 9c6d35a405a18..5b539ba996ddf 100644
> --- a/drivers/gpu/drm/i915/display/intel_link_bw.c
> +++ b/drivers/gpu/drm/i915/display/intel_link_bw.c
> @@ -8,6 +8,7 @@
>  #include "intel_atomic.h"
>  #include "intel_display_types.h"
>  #include "intel_dp_mst.h"
> +#include "intel_dp_tunnel.h"
>  #include "intel_fdi.h"
>  #include "intel_link_bw.h"
>  
> @@ -149,6 +150,10 @@ static int check_all_link_config(struct intel_atomic_state *state,
>  	if (ret)
>  		return ret;
>  
> +	ret = intel_dp_tunnel_atomic_check_link(state, limits);
> +	if (ret)
> +		return ret;
> +
>  	ret = intel_fdi_atomic_check_link(state, limits);
>  	if (ret)
>  		return ret;
> -- 
> 2.39.2

-- 
Ville Syrjälä
Intel