diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2021-09-01 19:03:59 +0300 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2021-09-02 15:42:49 +0300 |
| commit | 533140cb51ed42e97f1429d14ee2c8a93e5c10b1 (patch) | |
| tree | a04f5e1a93e6f47916aae51eb9a501642cbd05b6 | |
| parent | 6fd5a7c92eae512c6760391731ed1b4a9de1c4a6 (diff) | |
| download | linux-533140cb51ed42e97f1429d14ee2c8a93e5c10b1.tar.xz | |
drm/i915/dp: fix TGL and ICL max source rates
Combo phy is limited to 5.4 GHz on low-voltage SKUs. Combo phy DP is
limited to 5.4 GHz, while combo phy eDP can do 8.1 GHz.
Bspec: 20584, 20598, 49180, 49201
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210901160402.24816-3-animesh.manna@intel.com
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 322ffe7a75e3..025ba35a2583 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -291,6 +291,15 @@ static int dg2_max_source_rate(struct intel_dp *intel_dp) return intel_dp_is_edp(intel_dp) ? 810000 : 1350000; } +static bool is_low_voltage_sku(struct drm_i915_private *i915, enum phy phy) +{ + u32 voltage; + + voltage = intel_de_read(i915, ICL_PORT_COMP_DW3(phy)) & VOLTAGE_INFO_MASK; + + return voltage == VOLTAGE_INFO_0_85V; +} + static int icl_max_source_rate(struct intel_dp *intel_dp) { struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); @@ -298,7 +307,7 @@ static int icl_max_source_rate(struct intel_dp *intel_dp) enum phy phy = intel_port_to_phy(dev_priv, dig_port->base.port); if (intel_phy_is_combo(dev_priv, phy) && - !intel_dp_is_edp(intel_dp)) + (is_low_voltage_sku(dev_priv, phy) || !intel_dp_is_edp(intel_dp))) return 540000; return 810000; |