It's possible that i915 might get wedged between a boost and un-boost. Validate the i915-GuC connection before trying to send a H2G to change the min frequency.

Bug: https://gitlab.freedesktop.org/drm/intel/-/issues/4464

Cc: Ashutosh Dixit ashutosh.dixit@intel.com Signed-off-by: Vinay Belgaumkar vinay.belgaumkar@intel.com --- drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c index 4e1d3cd29164..22c1c12369f2 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c @@ -183,11 +183,15 @@ static int slpc_unset_param(struct intel_guc_slpc *slpc, static int slpc_force_min_freq(struct intel_guc_slpc *slpc, u32 freq) { struct drm_i915_private *i915 = slpc_to_i915(slpc); + struct intel_guc *guc = slpc_to_guc(slpc); intel_wakeref_t wakeref; int ret = 0;

lockdep_assert_held(&slpc->lock);

+ if (!intel_guc_is_ready(guc)) + return -ENODEV; + /* * This function is a little different as compared to * intel_guc_slpc_set_min_freq(). Softlimit will not be updated