On Tue, 17 Dec 2013, Vandana Kannan <vandana.kannan@xxxxxxxxx> wrote:
> From: Pradeep Bhat <pradeep.bhat@xxxxxxxxx>
>
> This patch and finds out the lowest refresh rate supported for the resolution
> same as the fixed_mode, based on the implementaion find_panel_downclock.
> It also checks the VBT fields to see if panel supports seamless DRRS or not.
> Based on above data it marks whether eDP panel supports seamless DRRS or not.
> This information is needed for supporting seamless DRRS switch for
> certain power saving usecases. This patch is tested by enabling the DRM logs
> and user should see whether Seamless DRRS is supported or not.
>
> Signed-off-by: Pradeep Bhat <pradeep.bhat@xxxxxxxxx>
> Signed-off-by: Vandana Kannan <vandana.kannan@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 2 ++
> drivers/gpu/drm/i915/intel_dp.c | 47 ++++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_drv.h | 29 +++++++++++++++++++++++
> 3 files changed, 78 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 02e11dc..c9bca16 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1462,8 +1462,10 @@ typedef struct drm_i915_private {
> /* Reclocking support */
> bool render_reclock_avail;
> bool lvds_downclock_avail;
> + bool edp_downclock_avail;
> /* indicates the reduced downclock for LVDS*/
> int lvds_downclock;
> + int edp_downclock;
> u16 orig_clock;
>
> bool mchbar_need_disable;
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 82de200..935b46e 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3524,6 +3524,48 @@ intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,
> I915_READ(pp_div_reg));
> }
>
> +static void
> +intel_dp_drrs_initialize(struct intel_digital_port *intel_dig_port,
> + struct intel_connector *intel_connector,
> + struct drm_display_mode *fixed_mode)
> +{
> + struct drm_connector *connector = &intel_connector->base;
> + struct intel_dp *intel_dp = &intel_dig_port->dp;
> + struct drm_device *dev = intel_dig_port->base.base.dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> +
> + /**
> + * Check if PSR is supported by panel and enabled
> + * if so then DRRS is reported as not supported for Haswell.
> + */
> + if (INTEL_INFO(dev)->gen < 8 && intel_edp_is_psr_enabled(dev)) {
> + DRM_INFO("eDP panel has PSR enabled. Cannot support DRRS\n");
> + return;
> + }
> +
> + /* First check if DRRS is enabled from VBT struct */
> + if (!dev_priv->vbt.intel_drrs_enabled) {
> + DRM_INFO("VBT doesn't support DRRS\n");
> + return;
> + }
> +
> + intel_connector->panel.downclock_mode = intel_find_panel_downclock(dev,
> + fixed_mode, connector);
> +
> + if (intel_connector->panel.downclock_mode != NULL &&
> + dev_priv->vbt.drrs_mode == SEAMLESS_DRRS_SUPPORT) {
> + dev_priv->edp_downclock_avail = true;
> + dev_priv->edp_downclock =
> + intel_connector->panel.downclock_mode->clock;
> +
> + intel_dp->drrs_state.is_drrs_supported
> + = dev_priv->vbt.drrs_mode;
> +
> + intel_dp->drrs_state.drrs_refresh_rate_type = DRRS_HIGH_RR;
> + DRM_INFO("SEAMLESS DRRS supported for eDP panel.\n");
> + }
> +}
> +
> static bool intel_edp_init_connector(struct intel_dp *intel_dp,
> struct intel_connector *intel_connector)
> {
> @@ -3537,6 +3579,8 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
> struct drm_display_mode *scan;
> struct edid *edid;
>
> + intel_dp->drrs_state.is_drrs_supported = DRRS_NOT_SUPPORTED;
> +
> if (!is_edp(intel_dp))
> return true;
>
> @@ -3581,6 +3625,9 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
> list_for_each_entry(scan, &connector->probed_modes, head) {
> if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
> fixed_mode = drm_mode_duplicate(dev, scan);
> + if (INTEL_INFO(dev)->gen >= 5)
> + intel_dp_drrs_initialize(intel_dig_port,
> + intel_connector, fixed_mode);
> break;
> }
> }
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 9f8b465..6ec5f4e 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -462,6 +462,34 @@ struct intel_hdmi {
>
> #define DP_MAX_DOWNSTREAM_PORTS 0x10
>
> +/**
> + * This enum is used to indicate the DRRS support type.
> + * The values of the enum map 1-to-1 with the values from VBT.
> + */
> +enum edp_panel_type {
This is about DRRS, not some fundamental "eDP panel type". The comment
above explains what this is, but why not make the enum self explanatory,
for example panel_drrs_support or something.
As to the 1-to-1 map mention, the vbt data is unsigned, but not
supported is -1 below...
> + DRRS_NOT_SUPPORTED = -1,
> + STATIC_DRRS_SUPPORT = 0,
> + SEAMLESS_DRRS_SUPPORT = 2
> +};
> +/**
> + * HIGH_RR is the highest eDP panel refresh rate read from EDID
> + * LOW_RR is the lowest eDP panel refresh rate found from EDID
> + * parsing for same resolution.
> + */
> +enum edp_drrs_refresh_rate_type {
> + DRRS_HIGH_RR,
> + DRRS_LOW_RR,
> + DRRS_MAX_RR, /* RR count */
> +};
> +/**
> + * The drrs_info struct will represent the DRRS feature for eDP
> + * panel.
> + */
> +struct drrs_info {
> + int is_drrs_supported;
IMHO anything that begins with "is" should be strictly boolean. When you
make this an enum per Chris' request, please change this as well. For
exampel drrs_support or something.
> + int drrs_refresh_rate_type;
> +};
> +
> struct intel_dp {
> uint32_t output_reg;
> uint32_t aux_ch_ctl_reg;
> @@ -487,6 +515,7 @@ struct intel_dp {
> bool want_panel_vdd;
> bool psr_setup_done;
> struct intel_connector *attached_connector;
> + struct drrs_info drrs_state;
> };
>
> struct intel_digital_port {
> --
> 1.7.9.5
>
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--
Jani Nikula, Intel Open Source Technology Center
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