Revert "ACPI: processor: Update cpuidle driver check in __acpi_processor_start()"

This reverts commit 0089ce1 which is
upstream commit 6cfed39.

This commit is causing a suspend regression on systems such as the Asus
Zephyrus G14 (GA402RJ) with Ryzen 7 6700H: when suspending, the display
turns off but the device fails to fully power down. This is not seen
with v7.0-rc1 which indicates that there are changes missing. Therefore,
revert this change.

Link: https://lore.kernel.org/all/lA7Dz_m7_nCF8KkRyEOcSCLg799Mm9_DN2r9hx7ISjw32OoKiB1r_YjGHIFX8vgqxpOkVJ8d_yHb-VsGAvIWC942D4-zdWxAIP4_k6ZIQi8=@protonmail.com/
Fixes: 0089ce1 ("ACPI: processor: Update cpuidle driver check in __acpi_processor_start()")
Reported-by: Athul Krishna <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: Sasha Levin

drivers/acpi/processor_driver.c

@@ -166,7 +166,7 @@ static int __acpi_processor_start(struct acpi_device *device)
 	if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
 		dev_dbg(&device->dev, "CPPC data invalid or not present\n");
 
-	if (cpuidle_get_driver() == &acpi_idle_driver)
+	if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
 		acpi_processor_power_init(pr);
 
 	acpi_pss_perf_init(pr);