On Wed, 11 Jan 2023, Andi Shyti <andi.sh...@linux.intel.com> wrote: > From: Aravind Iddamsetty <aravind.iddamse...@intel.com> > > During module load not all the punit transaction have completed > and we might end up timing out, as shown by the following > warning:
Root cause? > > i915 0000:4d:00.0: drm_WARN_ON_ONCE(timeout_base_ms > 3) > > Wait 10 seconds for the punit to settle and complete any > outstanding transactions upon module load. > > Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/7814 > No blank lines between the tag lines please. > Signed-off-by: Aravind Iddamsetty <aravind.iddamse...@intel.com> > Co-developed-by: Chris Wilson <ch...@chris-wilson.co.uk> > Cc: Rodrigo Vivi <rodrigo.v...@intel.com> > Signed-off-by: Andi Shyti <andi.sh...@linux.intel.com> > --- > drivers/gpu/drm/i915/intel_pcode.c | 35 ++++++++++++++++++++++++++---- > 1 file changed, 31 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_pcode.c > b/drivers/gpu/drm/i915/intel_pcode.c > index a234d9b4ed14..3db2ba439bb5 100644 > --- a/drivers/gpu/drm/i915/intel_pcode.c > +++ b/drivers/gpu/drm/i915/intel_pcode.c > @@ -204,15 +204,42 @@ int skl_pcode_request(struct intel_uncore *uncore, u32 > mbox, u32 request, > #undef COND > } > > +static int pcode_init_wait(struct intel_uncore *uncore, int timeout_ms) > +{ > + if (__intel_wait_for_register_fw(uncore, > + GEN6_PCODE_MAILBOX, > + GEN6_PCODE_READY, 0, > + 500, timeout_ms, > + NULL)) > + return -EPROBE_DEFER; This is already done within skl_pcode_request -> skl_pcode_try_request -> __snb_pcode_rw path, with waits in skl_pcode_request. Is there anyone who still understands what's being waited for, where, for how long, and why in the different code paths? I know I don't, and this isn't helping. There's also no explanation on the -EPROBE_DEFER return in the commit message or comments or anywhere. Again, root cause? BR, Jani. > + > + return skl_pcode_request(uncore, > + DG1_PCODE_STATUS, > + DG1_UNCORE_GET_INIT_STATUS, > + DG1_UNCORE_INIT_STATUS_COMPLETE, > + DG1_UNCORE_INIT_STATUS_COMPLETE, timeout_ms); > +} > + > int intel_pcode_init(struct intel_uncore *uncore) > { > + int err; > + > if (!IS_DGFX(uncore->i915)) > return 0; > > - return skl_pcode_request(uncore, DG1_PCODE_STATUS, > - DG1_UNCORE_GET_INIT_STATUS, > - DG1_UNCORE_INIT_STATUS_COMPLETE, > - DG1_UNCORE_INIT_STATUS_COMPLETE, 180000); > + /* > + * Wait 10 seconds so that the punit to settle and complete > + * any outstanding transactions upon module load > + */ > + err = pcode_init_wait(uncore, 10000); > + > + if (err) { > + drm_notice(&uncore->i915->drm, > + "Waiting for HW initialisation...\n"); > + err = pcode_init_wait(uncore, 180000); > + } > + > + return err; > } > > int snb_pcode_read_p(struct intel_uncore *uncore, u32 mbcmd, u32 p1, u32 p2, > u32 *val) -- Jani Nikula, Intel Open Source Graphics Center
