Re: [PATCH v6] drm/i915/edp: Allow alternate fixed mode for eDP if available.

Jani Nikula
2017-08-10T13:14:03Z

On Wed, 09 Aug 2017, Jim Bride <jim.bride@linux.intel.com> wrote:
> Some fixed resolution panels actually support more than one mode,
> with the only thing different being the refresh rate. Having this
> alternate mode available to us is desirable, because it allows us to
> test PSR on panels whose setup time at the preferred mode is too long.
> With this patch we allow the use of the alternate mode if it's
> available and it was specifically requested.
>
> v2 and v3: Rebase
> v4: * Fix up some leaky mode stuff (Chris)
> * Rebase
> v5: * Fix a NULL pointer derefrence (David Weinehall)
> v6: * Whitespace / spelling / checkpatch clean-up; no functional
> change. (David)
> * Rebase
>
> Cc: David Weinehall <david.weinehall@linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Reviewed-by: David Weinehall <david.weinehall@linux.intel.com>
> Signed-off-by: Jim Bride <jim.bride@linux.intel.com>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 38 +++++++++++++++++++++++++++++++++-----
> drivers/gpu/drm/i915/intel_drv.h | 2 ++
> drivers/gpu/drm/i915/intel_dsi.c | 2 +-
> drivers/gpu/drm/i915/intel_dvo.c | 2 +-
> drivers/gpu/drm/i915/intel_lvds.c | 3 ++-
> drivers/gpu/drm/i915/intel_panel.c | 6 ++++++
> 6 files changed, 45 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 76c8a0b..576b5af 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1606,6 +1606,23 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
> return bpp;
> }
>
> +static bool intel_edp_compare_alt_mode(struct drm_display_mode *m1,
> + struct drm_display_mode *m2)
> +{
> + bool bres = false;

What is bres?

> +
> + if (m1 && m2)
> + bres = (m1->hdisplay == m2->hdisplay &&
> + m1->hsync_start == m2->hsync_start &&
> + m1->hsync_end == m2->hsync_end &&
> + m1->htotal == m2->htotal &&
> + m1->vdisplay == m2->vdisplay &&
> + m1->vsync_start == m2->vsync_start &&
> + m1->vsync_end == m2->vsync_end &&
> + m1->vtotal == m2->vtotal);
> + return bres;

You know you could just do

return m1 && m2 && m1->hdisplay == m2->hdisplay && ...

But I'm nitpicking.

BR,
Jani.

> +}
> +
> bool
> intel_dp_compute_config(struct intel_encoder *encoder,
> struct intel_crtc_state *pipe_config,
> @@ -1652,8 +1669,16 @@ intel_dp_compute_config(struct intel_encoder *encoder,
> pipe_config->has_audio = intel_conn_state->force_audio == HDMI_AUDIO_ON;
>
> if (is_edp(intel_dp) && intel_connector->panel.fixed_mode) {
> - intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
> - adjusted_mode);
> + struct drm_display_mode *panel_mode =
> + intel_connector->panel.alt_fixed_mode;
> + struct drm_display_mode *req_mode = &pipe_config->base.mode;
> +
> + if (!intel_edp_compare_alt_mode(req_mode, panel_mode))
> + panel_mode = intel_connector->panel.fixed_mode;
> +
> + drm_mode_debug_printmodeline(panel_mode);
> +
> + intel_fixed_panel_mode(panel_mode, adjusted_mode);
>
> if (INTEL_GEN(dev_priv) >= 9) {
> int ret;
> @@ -5780,6 +5805,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
> struct drm_device *dev = intel_encoder->base.dev;
> struct drm_i915_private *dev_priv = to_i915(dev);
> struct drm_display_mode *fixed_mode = NULL;
> + struct drm_display_mode *alt_fixed_mode = NULL;
> struct drm_display_mode *downclock_mode = NULL;
> bool has_dpcd;
> struct drm_display_mode *scan;
> @@ -5835,13 +5861,14 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
> }
> intel_connector->edid = edid;
>
> - /* prefer fixed mode from EDID if available */
> + /* prefer fixed mode from EDID if available, save an alt mode also */
> list_for_each_entry(scan, &connector->probed_modes, head) {
> if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
> fixed_mode = drm_mode_duplicate(dev, scan);
> downclock_mode = intel_dp_drrs_init(
> intel_connector, fixed_mode);
> - break;
> + } else if (!alt_fixed_mode) {
> + alt_fixed_mode = drm_mode_duplicate(dev, scan);
> }
> }
>
> @@ -5878,7 +5905,8 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
> pipe_name(pipe));
> }
>
> - intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
> + intel_panel_init(&intel_connector->panel, fixed_mode, alt_fixed_mode,
> + downclock_mode);
> intel_connector->panel.backlight.power = intel_edp_backlight_power;
> intel_panel_setup_backlight(connector, pipe);
>
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index f91de9c..b3fcbb9 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -265,6 +265,7 @@ struct intel_encoder {
>
> struct intel_panel {
> struct drm_display_mode *fixed_mode;
> + struct drm_display_mode *alt_fixed_mode;
> struct drm_display_mode *downclock_mode;
>
> /* backlight */
> @@ -1679,6 +1680,7 @@ void intel_overlay_reset(struct drm_i915_private *dev_priv);
> /* intel_panel.c */
> int intel_panel_init(struct intel_panel *panel,
> struct drm_display_mode *fixed_mode,
> + struct drm_display_mode *alt_fixed_mode,
> struct drm_display_mode *downclock_mode);
> void intel_panel_fini(struct intel_panel *panel);
> void intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index b0b3adf..f0c11ae 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -1849,7 +1849,7 @@ void intel_dsi_init(struct drm_i915_private *dev_priv)
> connector->display_info.width_mm = fixed_mode->width_mm;
> connector->display_info.height_mm = fixed_mode->height_mm;
>
> - intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
> + intel_panel_init(&intel_connector->panel, fixed_mode, NULL, NULL);
> intel_panel_setup_backlight(connector, INVALID_PIPE);
>
> intel_dsi_add_properties(intel_connector);
> diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
> index baf369d..c0a0272 100644
> --- a/drivers/gpu/drm/i915/intel_dvo.c
> +++ b/drivers/gpu/drm/i915/intel_dvo.c
> @@ -552,7 +552,7 @@ void intel_dvo_init(struct drm_i915_private *dev_priv)
> */
> intel_panel_init(&intel_connector->panel,
> intel_dvo_get_current_mode(connector),
> - NULL);
> + NULL, NULL);
> intel_dvo->panel_wants_dither = true;
> }
>
> diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
> index 61d5579..8e21577 100644
> --- a/drivers/gpu/drm/i915/intel_lvds.c
> +++ b/drivers/gpu/drm/i915/intel_lvds.c
> @@ -1138,7 +1138,8 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
> out:
> mutex_unlock(&dev->mode_config.mutex);
>
> - intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
> + intel_panel_init(&intel_connector->panel, fixed_mode, NULL,
> + downclock_mode);
> intel_panel_setup_backlight(connector, INVALID_PIPE);
>
> lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index 88018fc..a17b1de 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -1920,11 +1920,13 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
>
> int intel_panel_init(struct intel_panel *panel,
> struct drm_display_mode *fixed_mode,
> + struct drm_display_mode *alt_fixed_mode,
> struct drm_display_mode *downclock_mode)
> {
> intel_panel_init_backlight_funcs(panel);
>
> panel->fixed_mode = fixed_mode;
> + panel->alt_fixed_mode = alt_fixed_mode;
> panel->downclock_mode = downclock_mode;
>
> return 0;
> @@ -1938,6 +1940,10 @@ void intel_panel_fini(struct intel_panel *panel)
> if (panel->fixed_mode)
> drm_mode_destroy(intel_connector->base.dev, panel->fixed_mode);
>
> + if (panel->alt_fixed_mode)
> + drm_mode_destroy(intel_connector->base.dev,
> + panel->alt_fixed_mode);
> +
> if (panel->downclock_mode)
> drm_mode_destroy(intel_connector->base.dev,
> panel->downclock_mode);

--
Jani Nikula, Intel Open Source Technology Center