Quoting Imre Deak (2018-02-08 17:41:02) > On BXT/GLK GEN6_PCODE_READ_RC6VIDS fails with > MAILBOX_P24C_CC_ILLEGAL_CMD, so don't try to do the query on these > platforms. Do it only on SNB, IVB and HSW, where we use this command > anyway for RC6 enabling. > > Based on my tests the command also succeeds on all LLC platforms, but > it's not clear if it's really supported on those (it returns 0 aka 245mv > for all RC6 states everywhere except on SNB). BSpec lists the command as > supported on SKL+ (see P24C_PCODE_MAILBOX_INTERFACE) but that's clearly > incorrect, since on SKL/KBL the same command ID is used for > SKL_PCODE_LOAD_HDCP_KEYS. Since the command fails on BXT/GLK, the BSpec > command list is also incorrect for those platforms (see > P_CR_P24C_PCODE_MAILBOX_INTERFACE_0_2_0_GTTMMADR). > > I filed a request to update that info in Bspec, but for now let's > assume a minimal set of platforms where the command is supported. > > Reference: https://bugs.freedesktop.org/show_bug.cgi?id=103337 > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> > --- > drivers/gpu/drm/i915/i915_debugfs.c | 24 +++++++++++++++--------- > 1 file changed, 15 insertions(+), 9 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c > index 2bdce9fea671..8f9045fae3cf 100644 > --- a/drivers/gpu/drm/i915/i915_debugfs.c > +++ b/drivers/gpu/drm/i915/i915_debugfs.c > @@ -1484,9 +1484,12 @@ static int gen6_drpc_info(struct seq_file *m) > gen9_powergate_status = I915_READ(GEN9_PWRGT_DOMAIN_STATUS); > } > > - mutex_lock(&dev_priv->pcu_lock); > - sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS, &rc6vids); > - mutex_unlock(&dev_priv->pcu_lock); > + if (INTEL_GEN(dev_priv) <= 7) { > + mutex_lock(&dev_priv->pcu_lock); > + sandybridge_pcode_read(dev_priv, GEN6_PCODE_READ_RC6VIDS, > + &rc6vids); > + mutex_unlock(&dev_priv->pcu_lock); > + } > > seq_printf(m, "RC1e Enabled: %s\n", > yesno(rcctl1 & GEN6_RC_CTL_RC1e_ENABLE)); > @@ -1542,12 +1545,15 @@ static int gen6_drpc_info(struct seq_file *m) > print_rc6_res(m, "RC6+ residency since boot:", GEN6_GT_GFX_RC6p); > print_rc6_res(m, "RC6++ residency since boot:", GEN6_GT_GFX_RC6pp); > > - seq_printf(m, "RC6 voltage: %dmV\n", > - GEN6_DECODE_RC6_VID(((rc6vids >> 0) & 0xff))); > - seq_printf(m, "RC6+ voltage: %dmV\n", > - GEN6_DECODE_RC6_VID(((rc6vids >> 8) & 0xff))); > - seq_printf(m, "RC6++ voltage: %dmV\n", > - GEN6_DECODE_RC6_VID(((rc6vids >> 16) & 0xff))); > + if (INTEL_GEN(dev_priv) <= 7) { I expect this will confuse gcc-4.4 and it will emit a maybe-used-uninitialised. I would set rc6vids=0 and then test if (rc6vids) here. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
