Re: [PATCH] drm/i915: Add debugfs entry for DRRS

[Rodrigo Vivi <rodrigo.vivi@gmail.com>]

On Tue, Mar 3, 2015 at 7:23 AM, Ramalingam C <ramalingam.c@intel.com> wrote:
> From: Vandana Kannan <vandana.kannan@intel.com>
>
> 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: Vandana Kannan <vandana.kannan@intel.com>
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c |  141 +++++++++++++++++++++++++++++++++++
>  1 file changed, 141 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 94b3984..90e56ca 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2870,6 +2870,146 @@ 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;
> +       u32 work_status;
> +
> +       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");
> +
> +       /*
> +        * Idleness DRRS detection states:
> +        *      Enabled   :     Idleness detection is active. When system is
> +        *                      Idle for the defined duration DRRS_LOW_RR
> +        *                      will be set. Or Idleness is already detected
> +        *                      and DRRS_LOW_RR is applied.
> +        *      Suspended :     Due to frontbuffer's busy state, Idleness
> +        *                      detection is suspended.
> +        *      Disabled  :     Idleness detection is disabled until a call is
> +        *                      made to enable. No encoder pointer will be
> +        *                      available.
> +        */
> +       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");
> +               work_status = work_busy(&drrs->work.work);
> +               if (drrs->busy_frontbuffer_bits) {
> +                       seq_puts(m, "Front buffer: Busy.\n");
> +                       seq_puts(m, "\t\tIdleness DRRS: Suspended");
> +               } else {
> +                       seq_puts(m, "Front buffer: Idle");
> +                       seq_puts(m, "\n\t\t");
> +                       if (drrs->refresh_rate_type == DRRS_HIGH_RR) {
> +                               if (work_status) {
> +                                       seq_puts(m, "Idleness DRRS: Enabled");

I couldn't understand yet why the work busy means DRRS enabled necessarily.
Isn't there a more reliable way to check for DRRS enabled?

Nothing that can't be done in a followup patch...  Also I'd like to
see drrs status now so feel free to use
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

> +                               } else {
> +                                       seq_puts(m, "Idleness DRRS: Suspended.");
> +                                       seq_puts(m, " FIXME: Shouldn't be here");
> +                               }
> +                       } else if (drrs->refresh_rate_type == DRRS_LOW_RR) {
> +                               seq_puts(m, "Idleness DRRS: Enabled");
> +                       }
> +               }
> +               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 +4688,7 @@ 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)
>
> --
> 1.7.9.5
>
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-- 
Rodrigo Vivi
Blog: http://blog.vivi.eng.br
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