From 83a7280ebc359726d4b79b8772c9fddd7fd03f43 Mon Sep 17 00:00:00 2001 From: Pradeep Bhat Date: Fri, 28 Mar 2014 10:14:57 +0530 Subject: [PATCH] drm/i915: Adding VBT fields to support eDP DRRS feature This patch reads the DRRS support and Mode type from VBT fields. The read information will be stored in VBT struct during BIOS parsing. The above functionality is needed for decision making whether DRRS feature is supported in i915 driver for eDP panels. This information helps us decide if seamless DRRS can be done at runtime to support certain power saving features. This patch was tested by setting necessary bit in VBT struct and merging the new VBT with system BIOS so that we can read the value. v2: Incorporated review comments from Chris Wilson Removed "intel_" as a prefix for DRRS specific declarations. v3: Incorporated Jani's review comments Removed function which deducts drrs mode from panel_type. Modified some print statements. Made changes to use DRRS_NOT_SUPPORTED as 0 instead of -1. v4: Incorporated Jani's review comments. Modifications around setting vbt drrs_type. Signed-off-by: Pradeep Bhat Signed-off-by: Vandana Kannan Acked-by: Jesse Barnes Cc: Jani Nikula [danvet: Drop the misleading/redundant comment about the added drrs field in the vbt struct as discussed with Jani on irc.] Reviewed-by: Jani Nikula Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_drv.h | 8 ++++++++ drivers/gpu/drm/i915/intel_bios.c | 34 ++++++++++++++++++++++++++++++- drivers/gpu/drm/i915/intel_bios.h | 29 ++++++++++++++++++++++++++ 3 files changed, 70 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index ff02225d5edd..828886009ef4 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1120,6 +1120,12 @@ struct ddi_vbt_port_info { uint8_t supports_dp:1; }; +enum drrs_support_type { + DRRS_NOT_SUPPORTED = 0, + STATIC_DRRS_SUPPORT = 1, + SEAMLESS_DRRS_SUPPORT = 2 +}; + struct intel_vbt_data { struct drm_display_mode *lfp_lvds_vbt_mode; /* if any */ struct drm_display_mode *sdvo_lvds_vbt_mode; /* if any */ @@ -1135,6 +1141,8 @@ struct intel_vbt_data { int lvds_ssc_freq; unsigned int bios_lvds_val; /* initial [PCH_]LVDS reg val in VBIOS */ + enum drrs_support_type drrs_type; + /* eDP */ int edp_rate; int edp_lanes; diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 4867f4cc0938..9b986775c4b0 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -206,7 +206,7 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv, const struct lvds_dvo_timing *panel_dvo_timing; const struct lvds_fp_timing *fp_timing; struct drm_display_mode *panel_fixed_mode; - int i, downclock; + int i, downclock, drrs_mode; lvds_options = find_section(bdb, BDB_LVDS_OPTIONS); if (!lvds_options) @@ -218,6 +218,28 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv, panel_type = lvds_options->panel_type; + drrs_mode = (lvds_options->dps_panel_type_bits + >> (panel_type * 2)) & MODE_MASK; + /* + * VBT has static DRRS = 0 and seamless DRRS = 2. + * The below piece of code is required to adjust vbt.drrs_type + * to match the enum drrs_support_type. + */ + switch (drrs_mode) { + case 0: + dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT; + DRM_DEBUG_KMS("DRRS supported mode is static\n"); + break; + case 2: + dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT; + DRM_DEBUG_KMS("DRRS supported mode is seamless\n"); + break; + default: + dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED; + DRM_DEBUG_KMS("DRRS not supported (VBT input)\n"); + break; + } + lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA); if (!lvds_lfp_data) return; @@ -516,6 +538,16 @@ parse_driver_features(struct drm_i915_private *dev_priv, if (driver->dual_frequency) dev_priv->render_reclock_avail = true; + + DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled); + /* + * If DRRS is not supported, drrs_type has to be set to 0. + * This is because, VBT is configured in such a way that + * static DRRS is 0 and DRRS not supported is represented by + * driver->drrs_enabled=false + */ + if (!driver->drrs_enabled) + dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED; } static void diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h index 83b7629e4367..d02e5f93c362 100644 --- a/drivers/gpu/drm/i915/intel_bios.h +++ b/drivers/gpu/drm/i915/intel_bios.h @@ -282,6 +282,9 @@ struct bdb_general_definitions { union child_device_config devices[0]; } __packed; +/* Mask for DRRS / Panel Channel / SSC / BLT control bits extraction */ +#define MODE_MASK 0x3 + struct bdb_lvds_options { u8 panel_type; u8 rsvd1; @@ -294,6 +297,18 @@ struct bdb_lvds_options { u8 lvds_edid:1; u8 rsvd2:1; u8 rsvd4; + /* LVDS Panel channel bits stored here */ + u32 lvds_panel_channel_bits; + /* LVDS SSC (Spread Spectrum Clock) bits stored here. */ + u16 ssc_bits; + u16 ssc_freq; + u16 ssc_ddt; + /* Panel color depth defined here */ + u16 panel_color_depth; + /* LVDS panel type bits stored here */ + u32 dps_panel_type_bits; + /* LVDS backlight control type bits stored here */ + u32 blt_control_type_bits; } __packed; /* LFP pointer table contains entries to the struct below */ @@ -479,6 +494,20 @@ struct bdb_driver_features { u8 hdmi_termination; u8 custom_vbt_version; + /* Driver features data block */ + u16 rmpm_enabled:1; + u16 s2ddt_enabled:1; + u16 dpst_enabled:1; + u16 bltclt_enabled:1; + u16 adb_enabled:1; + u16 drrs_enabled:1; + u16 grs_enabled:1; + u16 gpmt_enabled:1; + u16 tbt_enabled:1; + u16 psr_enabled:1; + u16 ips_enabled:1; + u16 reserved3:4; + u16 pc_feature_valid:1; } __packed; #define EDP_18BPP 0 -- 2.20.1