diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_sideband.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_sideband.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c index 0954f132726e..b1a5514e695a 100644 --- a/drivers/gpu/drm/i915/intel_sideband.c +++ b/drivers/gpu/drm/i915/intel_sideband.c @@ -182,6 +182,14 @@ u32 vlv_dpio_read(struct drm_i915_private *dev_priv, enum pipe pipe, int reg) vlv_sideband_rw(dev_priv, DPIO_DEVFN, DPIO_PHY_IOSF_PORT(DPIO_PHY(pipe)), DPIO_OPCODE_REG_READ, reg, &val); + + /* + * FIXME: There might be some registers where all 1's is a valid value, + * so ideally we should check the register offset instead... + */ + WARN(val == 0xffffffff, "DPIO read pipe %c reg 0x%x == 0x%x\n", + pipe_name(pipe), reg, val); + return val; } |
