linux-kernel - Re: [PATCH 4/4] drm/i915/display: Add handling for new "active bpc" property

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Message-ID: <bd6a27e7-3ae5-ecb1-2fef-e5f8c1b6a2ac@tuxedocomputers.com>
Date:   Mon, 7 Jun 2021 08:47:55 +0200
From:   Werner Sembach <wse@...edocomputers.com>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     amd-gfx@...ts.freedesktop.org, tzimmermann@...e.de,
        intel-gfx@...ts.freedesktop.org, sunpeng.li@....com,
        dri-devel@...ts.freedesktop.org, joonas.lahtinen@...ux.intel.com,
        maarten.lankhorst@...ux.intel.com, linux-kernel@...r.kernel.org,
        mripard@...nel.org, airlied@...ux.ie, jani.nikula@...ux.intel.com,
        daniel@...ll.ch, rodrigo.vivi@...el.com, alexander.deucher@....com,
        harry.wentland@....com, christian.koenig@....com
Subject: Re: [PATCH 4/4] drm/i915/display: Add handling for new "active bpc"
 property


Am 04.06.21 um 19:30 schrieb Ville Syrjälä:
> On Fri, Jun 04, 2021 at 07:17:23PM +0200, Werner Sembach wrote:
>> This commits implements the "active bpc" drm property for the Intel GPU driver.
>>
>> Signed-off-by: Werner Sembach <wse@...edocomputers.com>
>> ---
>>   drivers/gpu/drm/i915/display/intel_display.c | 13 +++++++++++++
>>   drivers/gpu/drm/i915/display/intel_dp.c      |  8 ++++++--
>>   drivers/gpu/drm/i915/display/intel_dp_mst.c  |  4 +++-
>>   drivers/gpu/drm/i915/display/intel_hdmi.c    |  4 +++-
>>   4 files changed, 25 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
>> index 64e9107d70f7..f7898d9d7438 100644
>> --- a/drivers/gpu/drm/i915/display/intel_display.c
>> +++ b/drivers/gpu/drm/i915/display/intel_display.c
>> @@ -10164,6 +10164,8 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>>   	struct drm_i915_private *dev_priv = to_i915(dev);
>>   	struct intel_crtc_state *new_crtc_state, *old_crtc_state;
>>   	struct intel_crtc *crtc;
>> +	struct drm_connector *connector;
>> +	struct drm_connector_state *new_conn_state;
>>   	u64 put_domains[I915_MAX_PIPES] = {};
>>   	intel_wakeref_t wakeref = 0;
>>   	int i;
>> @@ -10324,6 +10326,17 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>>   	}
>>   	intel_runtime_pm_put(&dev_priv->runtime_pm, state->wakeref);
>>   
>> +	/* Extract information from crtc to communicate it to userspace as connector properties */
>> +	for_each_new_connector_in_state(&state->base, connector, new_conn_state, i) {
>> +		struct drm_crtc *crtc = new_conn_state->crtc;
>> +		if (crtc) {
>> +			new_crtc_state = to_intel_crtc_state(drm_atomic_get_new_crtc_state(&state->base, crtc));
> intel_atomic_get_new_crtc_state()
Thanks, will use that.
>
>> +			new_conn_state->active_bpc = new_crtc_state->pipe_bpp / 3;
>> +		}
>> +		else
>> +			new_conn_state->active_bpc = 0;
>> +	}
> This also seems too late. I think the whole thing should be
> done somewhere around the normal swap_state() stuff.
Ok, will look into it.
>
>> +
>>   	/*
>>   	 * Defer the cleanup of the old state to a separate worker to not
>>   	 * impede the current task (userspace for blocking modesets) that
>> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
>> index 642c60f3d9b1..67826ba976ed 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
>> @@ -4671,10 +4671,14 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
>>   		intel_attach_force_audio_property(connector);
>>   
>>   	intel_attach_broadcast_rgb_property(connector);
>> -	if (HAS_GMCH(dev_priv))
>> +	if (HAS_GMCH(dev_priv)) {
>>   		drm_connector_attach_max_bpc_property(connector, 6, 10);
>> -	else if (DISPLAY_VER(dev_priv) >= 5)
>> +		drm_connector_attach_active_bpc_property(connector, 6, 10);
>> +	}
>> +	else if (DISPLAY_VER(dev_priv) >= 5) {
>>   		drm_connector_attach_max_bpc_property(connector, 6, 12);
>> +		drm_connector_attach_active_bpc_property(connector, 6, 12);
>> +	}
>>   
>>   	/* Register HDMI colorspace for case of lspcon */
>>   	if (intel_bios_is_lspcon_present(dev_priv, port)) {
>> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
>> index 2daa3f67791e..5a1869dc2210 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
>> @@ -844,8 +844,10 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
>>   	 */
>>   	connector->max_bpc_property =
>>   		intel_dp->attached_connector->base.max_bpc_property;
>> -	if (connector->max_bpc_property)
>> +	if (connector->max_bpc_property) {
>>   		drm_connector_attach_max_bpc_property(connector, 6, 12);
>> +		drm_connector_attach_active_bpc_property(connector, 6, 12);
>> +	}
>>   
>>   	return connector;
>>   
>> diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
>> index d69f0a6dc26d..8af78b27b6ce 100644
>> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
>> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
>> @@ -2463,8 +2463,10 @@ intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct drm_connector *c
>>   		drm_object_attach_property(&connector->base,
>>   			connector->dev->mode_config.hdr_output_metadata_property, 0);
>>   
>> -	if (!HAS_GMCH(dev_priv))
>> +	if (!HAS_GMCH(dev_priv)) {
>>   		drm_connector_attach_max_bpc_property(connector, 8, 12);
>> +		drm_connector_attach_active_bpc_property(connector, 8, 12);
>> +	}
>>   }
>>   
>>   /*
>> -- 
>> 2.25.1