drm/amd/pm: fix BUG: scheduling while atomic

BugLink: https://bugs.launchpad.net/bugs/2106770

commit 2a238b0 upstream.

atomic scheduling will be triggered in interrupt handler for
AC/DC mode switch as following backtrace.
Call Trace:
 <IRQ>
 dump_stack_lvl
 __schedule_bug
 __schedule
 schedule
 schedule_preempt_disabled
 __mutex_lock
 smu_cmn_send_smc_msg_with_param
 smu_v13_0_irq_process
 amdgpu_irq_dispatch
 amdgpu_ih_process
 amdgpu_irq_handler
 __handle_irq_event_percpu
 handle_irq_event
 handle_edge_irq
 __common_interrupt
 common_interrupt
 </IRQ>
 <TASK>
 asm_common_interrupt

Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Kun Liu <Kun.Liu2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 03cc84b)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Mehmet Basaran <mehmet.basaran@canonical.com>

Author: kunliu13

drivers/gpu/drm/amd/pm/swsmu/inc/smu_v13_0.h

@@ -302,5 +302,7 @@ int smu_v13_0_set_wbrf_exclusion_ranges(struct smu_context *smu,
 int smu_v13_0_get_boot_freq_by_index(struct smu_context *smu,
 				     enum smu_clk_type clk_type,
 				     uint32_t *value);
+
+void smu_v13_0_interrupt_work(struct smu_context *smu);
 #endif
 #endif

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c

@@ -1321,11 +1321,11 @@ static int smu_v13_0_set_irq_state(struct amdgpu_device *adev,
 	return 0;
 }
 
-static int smu_v13_0_ack_ac_dc_interrupt(struct smu_context *smu)
+void smu_v13_0_interrupt_work(struct smu_context *smu)
 {
-	return smu_cmn_send_smc_msg(smu,
-				    SMU_MSG_ReenableAcDcInterrupt,
-				    NULL);
+	smu_cmn_send_smc_msg(smu,
+			     SMU_MSG_ReenableAcDcInterrupt,
+			     NULL);
 }
 
 #define THM_11_0__SRCID__THM_DIG_THERM_L2H		0		/* ASIC_TEMP > CG_THERMAL_INT.DIG_THERM_INTH  */
@@ -1378,12 +1378,12 @@ static int smu_v13_0_irq_process(struct amdgpu_device *adev,
 			switch (ctxid) {
 			case 0x3:
 				dev_dbg(adev->dev, "Switched to AC mode!\n");
-				smu_v13_0_ack_ac_dc_interrupt(smu);
+				schedule_work(&smu->interrupt_work);
 				adev->pm.ac_power = true;
 				break;
 			case 0x4:
 				dev_dbg(adev->dev, "Switched to DC mode!\n");
-				smu_v13_0_ack_ac_dc_interrupt(smu);
+				schedule_work(&smu->interrupt_work);
 				adev->pm.ac_power = false;
 				break;
 			case 0x7:

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c

@@ -3096,6 +3096,7 @@ static const struct pptable_funcs smu_v13_0_0_ppt_funcs = {
 	.is_asic_wbrf_supported = smu_v13_0_0_wbrf_support_check,
 	.enable_uclk_shadow = smu_v13_0_enable_uclk_shadow,
 	.set_wbrf_exclusion_ranges = smu_v13_0_set_wbrf_exclusion_ranges,
+	.interrupt_work = smu_v13_0_interrupt_work,
 };
 
 void smu_v13_0_0_set_ppt_funcs(struct smu_context *smu)

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c

@@ -2667,6 +2667,7 @@ static const struct pptable_funcs smu_v13_0_7_ppt_funcs = {
 	.is_asic_wbrf_supported = smu_v13_0_7_wbrf_support_check,
 	.enable_uclk_shadow = smu_v13_0_enable_uclk_shadow,
 	.set_wbrf_exclusion_ranges = smu_v13_0_set_wbrf_exclusion_ranges,
+	.interrupt_work = smu_v13_0_interrupt_work,
 };
 
 void smu_v13_0_7_set_ppt_funcs(struct smu_context *smu)