[Intel-gfx] [PATCH v1] drm/i915/gsc: take a wakeref for the proxy-init-completion check

[Alan Previn]

Ensure intel_gsc_uc_fw_init_done and intel_gsc_uc_fw_proxy_init
takes a wakeref before reading GSC Shim registers.

NOTE: another patch in review also adds a call from selftest to
this same function. (https://patchwork.freedesktop.org/series/117713/)
which is why i am adding the wakeref inside the callee, not the
caller.

Fixes: 99afb7cc8c44 ("drm/i915/pxp: Add ARB session creation and cleanup")
Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
index f46eb17a7a98..1e5a8b2bdac9 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
@@ -27,7 +27,11 @@ static bool gsc_is_in_reset(struct intel_uncore *uncore)
 bool intel_gsc_uc_fw_proxy_init_done(struct intel_gsc_uc *gsc)
 {
 	struct intel_uncore *uncore = gsc_uc_to_gt(gsc)->uncore;
-	u32 fw_status = intel_uncore_read(uncore, GSC_FW_STATUS_REG);
+	intel_wakeref_t wakeref;
+	u32 fw_status;
+
+	with_intel_runtime_pm(uncore->rpm, wakeref)
+		fw_status = intel_uncore_read(uncore, GSC_FW_STATUS_REG);
 
 	return REG_FIELD_GET(GSC_FW_CURRENT_STATE, fw_status) ==
 	       GSC_FW_PROXY_STATE_NORMAL;
@@ -36,7 +40,11 @@ bool intel_gsc_uc_fw_proxy_init_done(struct intel_gsc_uc *gsc)
 bool intel_gsc_uc_fw_init_done(struct intel_gsc_uc *gsc)
 {
 	struct intel_uncore *uncore = gsc_uc_to_gt(gsc)->uncore;
-	u32 fw_status = intel_uncore_read(uncore, GSC_FW_STATUS_REG);
+	intel_wakeref_t wakeref;
+	u32 fw_status;
+
+	with_intel_runtime_pm(uncore->rpm, wakeref)
+		fw_status = intel_uncore_read(uncore, GSC_FW_STATUS_REG);
 
 	return fw_status & GSC_FW_INIT_COMPLETE_BIT;
 }

base-commit: 27187d09511e1d47dbaaf91c7332319551a8edab
-- 
2.39.0