From: Matt Roper <matthew.d.roper@xxxxxxxxx> Certain combo PHYs act as a compensation master to other PHYs and need to be initialized with a special irefgen bit in the PORT_COMP_DW8 register. Previously PHY A was the only compensation master (for PHYs B & C), but RKL adds a fourth PHY which is slaved to PHY C instead. Bspec: 49291 Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx> Cc: José Roberto de Souza <jose.souza@xxxxxxxxx> Cc: Aditya Swarup <aditya.swarup@xxxxxxxxx> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx> Reviewed-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20200504225227.464666-19-matthew.d.roper@xxxxxxxxx --- .../gpu/drm/i915/display/intel_combo_phy.c | 25 +++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c index 43d8784f6fa0..77b04bb3ec62 100644 --- a/drivers/gpu/drm/i915/display/intel_combo_phy.c +++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c @@ -234,6 +234,27 @@ static bool ehl_vbt_ddi_d_present(struct drm_i915_private *i915) return false; } +static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy) +{ + /* + * Certain PHYs are connected to compensation resistors and act + * as masters to other PHYs. + * + * ICL,TGL: + * A(master) -> B(slave), C(slave) + * RKL: + * A(master) -> B(slave) + * C(master) -> D(slave) + * + * We must set the IREFGEN bit for any PHY acting as a master + * to another PHY. + */ + if (IS_ROCKETLAKE(dev_priv) && phy == PHY_C) + return true; + + return phy == PHY_A; +} + static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv, enum phy phy) { @@ -245,7 +266,7 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv, ret = cnl_verify_procmon_ref_values(dev_priv, phy); - if (phy == PHY_A) { + if (phy_is_master(dev_priv, phy)) { ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy), IREFGEN, IREFGEN); @@ -356,7 +377,7 @@ static void icl_combo_phys_init(struct drm_i915_private *dev_priv) skip_phy_misc: cnl_set_procmon_ref_values(dev_priv, phy); - if (phy == PHY_A) { + if (phy_is_master(dev_priv, phy)) { val = intel_de_read(dev_priv, ICL_PORT_COMP_DW8(phy)); val |= IREFGEN; intel_de_write(dev_priv, ICL_PORT_COMP_DW8(phy), val); -- 2.26.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
