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drm/i915/bxt: Sanitiy check the PHY lane power down status

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We can check the power state of the PHY data and common lanes as
reported by the PHY. Do this in case we need to debug problems where the
PHY gets stuck in an unexpected state.

Note that I only check these when the lanes are expected to be powered
on purpose, since it's not clear at what point the PHY power/clock gates
things.

v2:
- Don't report the encoder as disabled when the sanity check fails.
  (Ville)

CC: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465825477-32671-1-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2016-06-13 16:44:37 +03:00
parent 324513c0ef
commit e93da0a013
2 changed files with 34 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/i915/i915_reg.h
View File

@ -1279,6 +1279,15 @@ enum skl_disp_power_wells {
#define BXT_P_CR_GT_DISP_PWRON _MMIO(0x138090)
#define GT_DISPLAY_POWER_ON(phy) (1 << (phy))
#define _BXT_PHY_CTL_DDI_A 0x64C00
#define _BXT_PHY_CTL_DDI_B 0x64C10
#define _BXT_PHY_CTL_DDI_C 0x64C20
#define BXT_PHY_CMNLANE_POWERDOWN_ACK (1 << 10)
#define BXT_PHY_LANE_POWERDOWN_ACK (1 << 9)
#define BXT_PHY_LANE_ENABLED (1 << 8)
#define BXT_PHY_CTL(port) _MMIO_PORT(port, _BXT_PHY_CTL_DDI_A, \
_BXT_PHY_CTL_DDI_B)
#define _PHY_CTL_FAMILY_EDP 0x64C80
#define _PHY_CTL_FAMILY_DDI 0x64C90
#define COMMON_RESET_DIS (1 << 31)

25
drivers/gpu/drm/i915/intel_ddi.c
View File

@ -1342,6 +1342,14 @@ bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
DRM_DEBUG_KMS("No pipe for ddi port %c found\n", port_name(port));
out:
if (ret && IS_BROXTON(dev_priv)) {
tmp = I915_READ(BXT_PHY_CTL(port));
if ((tmp & (BXT_PHY_LANE_POWERDOWN_ACK |
BXT_PHY_LANE_ENABLED)) != BXT_PHY_LANE_ENABLED)
DRM_ERROR("Port %c enabled but PHY powered down? "
"(PHY_CTL %08x)\n", port_name(port), tmp);
}
intel_display_power_put(dev_priv, power_domain);
return ret;
@ -1745,6 +1753,8 @@ static void intel_disable_ddi(struct intel_encoder *intel_encoder)
bool bxt_ddi_phy_is_enabled(struct drm_i915_private *dev_priv,
enum dpio_phy phy)
{
enum port port;
if (!(I915_READ(BXT_P_CR_GT_DISP_PWRON) & GT_DISPLAY_POWER_ON(phy)))
return false;
@ -1770,6 +1780,21 @@ bool bxt_ddi_phy_is_enabled(struct drm_i915_private *dev_priv,
return false;
}
for_each_port_masked(port,
phy == DPIO_PHY0 ? BIT(PORT_B) | BIT(PORT_C) :
BIT(PORT_A)) {
u32 tmp = I915_READ(BXT_PHY_CTL(port));
if (tmp & BXT_PHY_CMNLANE_POWERDOWN_ACK) {
DRM_DEBUG_DRIVER("DDI PHY %d powered, but common lane "
"for port %c powered down "
"(PHY_CTL %08x)\n",
phy, port_name(port), tmp);
return false;
}
}
return true;
}