On Tue, 2020-11-17 at 17:14 +0000, Chris Wilson wrote:
When the HW is powered down, the register state and links are lost. This may be an issue in the firmware, or in the code expectations; whatever it is, it is expected behaviour now for Tigerlake; stop warning!
References: https://gitlab.freedesktop.org/drm/intel/-/issues/2411
We are missing a IFWI/firmware update to fix this issue, already asked CI team to update but no luck so far.
During icl_combo_phys_uninit() is expected to have the registers set with expected values as it was not powered down yet.
Fixes: 239bef676d8e ("drm/i915/display: Implement new combo phy initialization step") Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Clinton A Taylor clinton.a.taylor@intel.com Cc: Lucas De Marchi lucas.demarchi@intel.com Cc: Matt Roper matthew.d.roper@intel.com Cc: José Roberto de Souza jose.souza@intel.com Cc: stable@vger.kernel.org # v5.9+
drivers/gpu/drm/i915/display/intel_combo_phy.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c index d5ad61e4083e..9a87df982af8 100644 --- a/drivers/gpu/drm/i915/display/intel_combo_phy.c +++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c @@ -428,9 +428,9 @@ static void icl_combo_phys_uninit(struct drm_i915_private *dev_priv)
if (phy == PHY_A && !icl_combo_phy_verify_state(dev_priv, phy))
drm_warn(&dev_priv->drm,"Combo PHY %c HW state changed unexpectedly\n",phy_name(phy));
drm_dbg_kms(&dev_priv->drm,"Combo PHY %c HW state changed unexpectedly\n",phy_name(phy));if (!has_phy_misc(dev_priv, phy)) goto skip_phy_misc;