[Intel-gfx] [RESEND FOR CI PATCH v8 4/4] drm/dp: Track MST link bandwidth

[Daniel Vetter]

On Mon, May 01, 2017 at 11:36:59AM -0700, Dhinakaran Pandiyan wrote:
> From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan at intel.com>
> 
> Use the added helpers to track MST link bandwidth for atomic modesets.
> Link bw is acquired in the ->atomic_check() phase when CRTCs are being
> enabled with drm_atomic_find_vcpi_slots(). Similarly, link bw is released
> during ->atomic_check() with the connector helper callback ->atomic_check()
> when CRTCs are disabled.
> 
> v6: active_changed does not alter vcpi allocations (Maarten)
> v5: Implement connector->atomic_check() in place of atomic_release()
> v4: Return an int from intel_dp_mst_atomic_release() (Maarten)
> v3:
>  Handled the case where ->atomic_release() is called more than once
>  during an atomic_check() for the same state.
> v2:
>  Squashed atomic_release() implementation and caller (Daniel)
>  Fixed logic for connector-crtc switching case (Daniel)
>  Fixed logic for suspend-resume case.
> 
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Archit Taneja <architt at codeaurora.org>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Harry Wentland <Harry.wentland at amd.com>
> 
> Acked-by: Harry Wentland <harry.wentland at amd.com>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp_mst.c | 48 ++++++++++++++++++++++++++++++++-----
>  1 file changed, 42 insertions(+), 6 deletions(-)

This only touches i915 code, the prefix for the patch title should be
drm/i915 or drm/i915/dp, not drm/dp. drm/dp is only for core dp code
shared among drivers.
-Daniel

> 
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index 5af22a7..68c788e 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -39,7 +39,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
>  	struct intel_dp *intel_dp = &intel_dig_port->dp;
>  	struct intel_connector *connector =
>  		to_intel_connector(conn_state->connector);
> -	struct drm_atomic_state *state;
> +	struct drm_atomic_state *state = pipe_config->base.state;
>  	int bpp;
>  	int lane_count, slots;
>  	const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
> @@ -57,20 +57,24 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
>  	 * seem to suggest we should do otherwise.
>  	 */
>  	lane_count = intel_dp_max_lane_count(intel_dp);
> -
>  	pipe_config->lane_count = lane_count;
>  
>  	pipe_config->pipe_bpp = bpp;
> -	pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
>  
> -	state = pipe_config->base.state;
> +	pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
>  
>  	if (drm_dp_mst_port_has_audio(&intel_dp->mst_mgr, connector->port))
>  		pipe_config->has_audio = true;
> -	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
>  
> +	mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
>  	pipe_config->pbn = mst_pbn;
> -	slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
> +
> +	slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr,
> +					      connector->port, mst_pbn);
> +	if (slots < 0) {
> +		DRM_DEBUG_KMS("failed finding vcpi slots:%d\n", slots);
> +		return false;
> +	}
>  
>  	intel_link_compute_m_n(bpp, lane_count,
>  			       adjusted_mode->crtc_clock,
> @@ -80,7 +84,38 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
>  	pipe_config->dp_m_n.tu = slots;
>  
>  	return true;
> +}
>  
> +static int intel_dp_mst_atomic_check(struct drm_connector *connector,
> +		struct drm_connector_state *new_conn_state)
> +{
> +	struct drm_atomic_state *state = new_conn_state->state;
> +	struct drm_connector_state *old_conn_state;
> +	struct drm_crtc *old_crtc;
> +	struct drm_crtc_state *crtc_state;
> +	int slots, ret = 0;
> +
> +	old_conn_state = drm_atomic_get_old_connector_state(state, connector);
> +	old_crtc = old_conn_state->crtc;
> +	if (!old_crtc)
> +		return ret;
> +
> +	crtc_state = drm_atomic_get_new_crtc_state(state, old_crtc);
> +	slots = to_intel_crtc_state(crtc_state)->dp_m_n.tu;
> +	if (drm_atomic_crtc_needs_modeset(crtc_state) && slots > 0) {
> +		struct drm_dp_mst_topology_mgr *mgr;
> +		struct drm_encoder *old_encoder;
> +
> +		old_encoder = old_conn_state->best_encoder;
> +		mgr = &enc_to_mst(old_encoder)->primary->dp.mst_mgr;
> +
> +		ret = drm_dp_atomic_release_vcpi_slots(state, mgr, slots);
> +		if (ret)
> +			DRM_DEBUG_KMS("failed releasing %d vcpi slots:%d\n", slots, ret);
> +		else
> +			to_intel_crtc_state(crtc_state)->dp_m_n.tu = 0;
> +	}
> +	return ret;
>  }
>  
>  static void intel_mst_disable_dp(struct intel_encoder *encoder,
> @@ -378,6 +413,7 @@ static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_fun
>  	.mode_valid = intel_dp_mst_mode_valid,
>  	.atomic_best_encoder = intel_mst_atomic_best_encoder,
>  	.best_encoder = intel_mst_best_encoder,
> +	.atomic_check = intel_dp_mst_atomic_check,
>  };
>  
>  static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
> -- 
> 2.7.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch