FROMLIST: PCI: qcom: Prevent GDSC power down on suspend

[ziyuezhang-123]

Currently, the driver expects the devices to remain in D0 across system suspend, but the genpd framework may still power down the associated GDSC during suspend. When that happens, the PCIe link goes down and cannot be recovered on resume.

Prevent genpd from turning off the PCIe GDSC by using dev_pm_genpd_rpm_always_on() so that the power domain stays on while the controller is suspended. This preserves the link state across suspend/resume and avoids unrecoverable link failures.

Link: https://lore.kernel.org/all/20260128-genpd_fix-v1-1-cd45a249d12f@oss.qualcomm.com/
Fixes: 82a8238 ("PCI: qcom: Add Qualcomm PCIe controller driver")
Cc: stable@vger.kernel.org

[qcomlnxci]

Test jobs on 2a8e1d1

• Job 35344 on kaanapali-qrd
• Job 35345 on lemans-evk
• Job 35349 on qcs615-ride
• Job 35346 on qcs6490-rb3gen2
• Job 35351 on qcs8300-ride
• Job 35347 on qcs9100-ride-r3
• Job 35348 on sm8750-mtp
• Job 35343 on x1e80100-crd

[qcomlnxci]

Test Matrix

Test Case	kaanapali-qrd	lemans-evk	qcs615-ride	qcs6490-rb3gen2	qcs8300-ride	qcs9100-ride-r3	sm8750-mtp	x1e80100-crd
BT_FW_KMD_Service	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	❌ Fail	◻️
BT_ON_OFF	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	⚠️ skip	◻️
BT_SCAN	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	⚠️ skip	◻️
CPUFreq_Validation	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
CPU_affinity	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
DSP_AudioPD	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Ethernet	◻️	◻️	◻️	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	◻️
Freq_Scaling	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	❌ Fail	◻️
GIC	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
IPA	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Interrupts	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
OpenCV	◻️	◻️	◻️	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	◻️
PCIe	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Probe_Failure_Check	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	❌ Fail	◻️
RMNET	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
UFS_Validation	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
USBHost	◻️	◻️	◻️	❌ Fail	✅ Pass	✅ Pass	❌ Fail	◻️
WiFi_Firmware_Driver	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	⚠️ skip	◻️
WiFi_OnOff	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	⚠️ skip	◻️
cdsp_remoteproc	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	❌ Fail	◻️
hotplug	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
irq	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
kaslr	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
pinctrl	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
qcom_hwrng	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
remoteproc	◻️	◻️	◻️	✅ Pass	❌ Fail	✅ Pass	❌ Fail	◻️
rngtest	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
shmbridge	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
smmu	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
watchdog	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
wpss_remoteproc	◻️	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️

[qcomlnxci]

Test jobs on 2a8e1d1

• Job 36064 on kaanapali-qrd
• Job 36063 on lemans-evk
• Job 36067 on qcs615-ride
• Job 36066 on qcs6490-rb3gen2
• Job 36068 on qcs8300-ride
• Job 36069 on qcs9100-ride-r3
• Job 36065 on sm8750-mtp
• Job 36062 on x1e80100-crd

[qcomlnxci]

Test Matrix

Test Case	kaanapali-qrd	lemans-evk	qcs615-ride	qcs6490-rb3gen2	qcs8300-ride	qcs9100-ride-r3	sm8750-mtp	x1e80100-crd
BT_FW_KMD_Service	◻️	❌ Fail	❌ Fail	✅ Pass	✅ Pass	✅ Pass	❌ Fail	◻️
BT_ON_OFF	◻️	✅ Pass	⚠️ skip	✅ Pass	✅ Pass	✅ Pass	⚠️ skip	◻️
BT_SCAN	◻️	✅ Pass	⚠️ skip	✅ Pass	✅ Pass	✅ Pass	⚠️ skip	◻️
CPUFreq_Validation	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
CPU_affinity	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
DSP_AudioPD	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Ethernet	◻️	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	◻️
Freq_Scaling	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	❌ Fail	◻️
GIC	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
IPA	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Interrupts	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
OpenCV	◻️	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	◻️
PCIe	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Probe_Failure_Check	◻️	❌ Fail	❌ Fail	✅ Pass	❌ Fail	✅ Pass	❌ Fail	◻️
RMNET	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
UFS_Validation	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
USBHost	◻️	❌ Fail	✅ Pass	❌ Fail	✅ Pass	✅ Pass	❌ Fail	◻️
WiFi_Firmware_Driver	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	⚠️ skip	◻️
WiFi_OnOff	◻️	⚠️ skip	⚠️ skip	✅ Pass	✅ Pass	✅ Pass	⚠️ skip	◻️
cdsp_remoteproc	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	❌ Fail	◻️
hotplug	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
irq	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
kaslr	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
pinctrl	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
qcom_hwrng	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
remoteproc	◻️	✅ Pass	✅ Pass	✅ Pass	❌ Fail	✅ Pass	❌ Fail	◻️
rngtest	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
shmbridge	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
smmu	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
watchdog	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
wpss_remoteproc	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️