drm/i915/bios: Add function to check if edp data override is needed

Add a function that helps identify if the rate provided needs to
be overridden. For this we need a function that compares the rate
provided and bitmask of rates provided in VBT.

--v2
-Rename functions [Jani]
-Return the mask instead of parsing it in function [Jani]
-Move the declaration in header [Jani]

--v3
-Change function name to depict what the function does [Ankit]

--v4
-Lets not use hweight [Ankit]

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://lore.kernel.org/r/20250821042653.269227-3-suraj.kandpal@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index cf464c68441a35561fe54ab0e1dcfeb64fc53519..7d7193a05d8860b6c9650bbd4e7ac8d14502f6b9 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2481,6 +2481,25 @@ static int parse_bdb_216_dp_max_link_rate(const int vbt_max_link_rate)
        }
 }
 
+static u32 edp_rate_override_mask(int rate)
+{
+       switch (rate) {
+       case 2000000: return BDB_263_VBT_EDP_LINK_RATE_20;
+       case 1350000: return BDB_263_VBT_EDP_LINK_RATE_13_5;
+       case 1000000: return BDB_263_VBT_EDP_LINK_RATE_10;
+       case 810000: return BDB_263_VBT_EDP_LINK_RATE_8_1;
+       case 675000: return BDB_263_VBT_EDP_LINK_RATE_6_75;
+       case 540000: return BDB_263_VBT_EDP_LINK_RATE_5_4;
+       case 432000: return BDB_263_VBT_EDP_LINK_RATE_4_32;
+       case 324000: return BDB_263_VBT_EDP_LINK_RATE_3_24;
+       case 270000: return BDB_263_VBT_EDP_LINK_RATE_2_7;
+       case 243000: return BDB_263_VBT_EDP_LINK_RATE_2_43;
+       case 216000: return BDB_263_VBT_EDP_LINK_RATE_2_16;
+       case 162000: return BDB_263_VBT_EDP_LINK_RATE_1_62;
+       default: return 0;
+       }
+}
+
 int intel_bios_dp_max_link_rate(const struct intel_bios_encoder_data *devdata)
 {
        if (!devdata || devdata->display->vbt.version < 216)
@@ -2500,6 +2519,19 @@ int intel_bios_dp_max_lane_count(const struct intel_bios_encoder_data *devdata)
        return devdata->child.dp_max_lane_count + 1;
 }
 
+bool
+intel_bios_encoder_reject_edp_rate(const struct intel_bios_encoder_data *devdata,
+                                  int rate)
+{
+       if (!devdata || devdata->display->vbt.version < 263)
+               return false;
+
+       if (devdata->child.edp_data_rate_override == BDB_263_VBT_EDP_RATES_MASK)
+               return false;
+
+       return devdata->child.edp_data_rate_override & edp_rate_override_mask(rate);
+}
+
 static void sanitize_device_type(struct intel_bios_encoder_data *devdata,
                                 enum port port)
 {

diff --git a/drivers/gpu/drm/i915/display/intel_bios.h b/drivers/gpu/drm/i915/display/intel_bios.h
index 8fdde85f7939c323d38e2cd0b1a1130134f1ce3a..f9e438b2787bd50836fbb700c0dd18283b487e0c 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_bios.h
+++ b/drivers/gpu/drm/i915/display/intel_bios.h
@@ -85,6 +85,8 @@ bool intel_bios_encoder_is_lspcon(const struct intel_bios_encoder_data *devdata)
 bool intel_bios_encoder_lane_reversal(const struct intel_bios_encoder_data *devdata);
 bool intel_bios_encoder_hpd_invert(const struct intel_bios_encoder_data *devdata);
 enum port intel_bios_encoder_port(const struct intel_bios_encoder_data *devdata);
+bool intel_bios_encoder_reject_edp_rate(const struct intel_bios_encoder_data *devdata,
+                                       int rate);
 enum aux_ch intel_bios_dp_aux_ch(const struct intel_bios_encoder_data *devdata);
 int intel_bios_dp_boost_level(const struct intel_bios_encoder_data *devdata);
 int intel_bios_dp_max_lane_count(const struct intel_bios_encoder_data *devdata);