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:
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 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; + + 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) -- 2.34.1
