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Commit a54746e3 authored by Vandana Kannan's avatar Vandana Kannan Committed by Daniel Vetter
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drm/i915: Add debugfs entry for DRRS 



Adding a debugfs entry to determine if DRRS is supported or not

V2: [By Ram]: Following details about the active crtc will be filled
	in seq-file of the debugfs
	1. Encoder output type
	2. DRRS Support on this CRTC
	3. DRRS current state
	4. Current Vrefresh
Format is as follows:
CRTC 1:  Output: eDP, DRRS Supported: Yes (Seamless), DRRS_State: DRRS_HIGH_RR, Vrefresh: 60
CRTC 2:  Output: HDMI, DRRS Supported : No, VBT DRRS_type: Seamless
CRTC 1:  Output: eDP, DRRS Supported: Yes (Seamless), DRRS_State: DRRS_LOW_RR, Vrefresh: 40
CRTC 2:  Output: HDMI, DRRS Supported : No, VBT DRRS_type: Seamless

V3: [By Ram]: Readability is improved.
	Another error case is covered [Daniel]

V4: [By Ram]: Current status of the Idleness DRRS along with
	the Front buffer bits are added to the debugfs. [Rodrigo]

V5: [By Ram]: Rephrased to make it easy to understand.
	And format is modified. [Rodrigo]

V6: [By Ram]: Modeset mutex are acquired for each crtc along with
	renaming the Idleness detection states  [Daniel]

Signed-off-by: default avatarVandana Kannan <vandana.kannan@intel.com>
Signed-off-by: default avatarRamalingam C <ramalingam.c@intel.com>
Reviewed-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
[danvet: dump full busy_frontbuffer_bits and remove the dubios
computed logical state of DRRS - debugfs is about what is fact,
developers should reach their own conclusion when debugging issues.]
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 27cd4461

drivers/gpu/drm/i915/i915_debugfs.c

+110 −0
Original line number Diff line number Diff line
@@ -2870,6 +2870,115 @@ static int i915_ddb_info(struct seq_file *m, void *unused) 
	return 0;

}



static void drrs_status_per_crtc(struct seq_file *m,

		struct drm_device *dev, struct intel_crtc *intel_crtc)

{

	struct intel_encoder *intel_encoder;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct i915_drrs *drrs = &dev_priv->drrs;

	int vrefresh = 0;



	for_each_encoder_on_crtc(dev, &intel_crtc->base, intel_encoder) {

		/* Encoder connected on this CRTC */

		switch (intel_encoder->type) {

		case INTEL_OUTPUT_EDP:

			seq_puts(m, "eDP:\n");

			break;

		case INTEL_OUTPUT_DSI:

			seq_puts(m, "DSI:\n");

			break;

		case INTEL_OUTPUT_HDMI:

			seq_puts(m, "HDMI:\n");

			break;

		case INTEL_OUTPUT_DISPLAYPORT:

			seq_puts(m, "DP:\n");

			break;

		default:

			seq_printf(m, "Other encoder (id=%d).\n",

						intel_encoder->type);

			return;

		}

	}



	if (dev_priv->vbt.drrs_type == STATIC_DRRS_SUPPORT)

		seq_puts(m, "\tVBT: DRRS_type: Static");

	else if (dev_priv->vbt.drrs_type == SEAMLESS_DRRS_SUPPORT)

		seq_puts(m, "\tVBT: DRRS_type: Seamless");

	else if (dev_priv->vbt.drrs_type == DRRS_NOT_SUPPORTED)

		seq_puts(m, "\tVBT: DRRS_type: None");

	else

		seq_puts(m, "\tVBT: DRRS_type: FIXME: Unrecognized Value");



	seq_puts(m, "\n\n");



	if (intel_crtc->config->has_drrs) {

		struct intel_panel *panel;



		mutex_lock(&drrs->mutex);

		/* DRRS Supported */

		seq_puts(m, "\tDRRS Supported: Yes\n");



		/* disable_drrs() will make drrs->dp NULL */

		if (!drrs->dp) {

			seq_puts(m, "Idleness DRRS: Disabled");

			mutex_unlock(&drrs->mutex);

			return;

		}



		panel = &drrs->dp->attached_connector->panel;

		seq_printf(m, "\t\tBusy_frontbuffer_bits: 0x%X",

					drrs->busy_frontbuffer_bits);



		seq_puts(m, "\n\t\t");

		if (drrs->refresh_rate_type == DRRS_HIGH_RR) {

			seq_puts(m, "DRRS_State: DRRS_HIGH_RR\n");

			vrefresh = panel->fixed_mode->vrefresh;

		} else if (drrs->refresh_rate_type == DRRS_LOW_RR) {

			seq_puts(m, "DRRS_State: DRRS_LOW_RR\n");

			vrefresh = panel->downclock_mode->vrefresh;

		} else {

			seq_printf(m, "DRRS_State: Unknown(%d)\n",

						drrs->refresh_rate_type);

			mutex_unlock(&drrs->mutex);

			return;

		}

		seq_printf(m, "\t\tVrefresh: %d", vrefresh);



		seq_puts(m, "\n\t\t");

		mutex_unlock(&drrs->mutex);

	} else {

		/* DRRS not supported. Print the VBT parameter*/

		seq_puts(m, "\tDRRS Supported : No");

	}

	seq_puts(m, "\n");

}



static int i915_drrs_status(struct seq_file *m, void *unused)

{

	struct drm_info_node *node = m->private;

	struct drm_device *dev = node->minor->dev;

	struct intel_crtc *intel_crtc;

	int active_crtc_cnt = 0;



	for_each_intel_crtc(dev, intel_crtc) {

		drm_modeset_lock(&intel_crtc->base.mutex, NULL);



		if (intel_crtc->active) {

			active_crtc_cnt++;

			seq_printf(m, "\nCRTC %d:  ", active_crtc_cnt);



			drrs_status_per_crtc(m, dev, intel_crtc);

		}



		drm_modeset_unlock(&intel_crtc->base.mutex);

	}



	if (!active_crtc_cnt)

		seq_puts(m, "No active crtc found\n");



	return 0;

}



struct pipe_crc_info {

	const char *name;

	struct drm_device *dev;
@@ -4548,6 +4657,7 @@ static const struct drm_info_list i915_debugfs_list[] = { 
	{"i915_wa_registers", i915_wa_registers, 0},

	{"i915_ddb_info", i915_ddb_info, 0},

	{"i915_sseu_status", i915_sseu_status, 0},

	{"i915_drrs_status", i915_drrs_status, 0},

};

#define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)