wifi: brcmfmac: Fix SDIO suspend/resume regression

After commit 92cadedd9d ("brcmfmac: Avoid keeping power to SDIO card
unless WOWL is used"), the wifi adapter by default is turned off on suspend
and then re-probed on resume.

In at least 2 model x86/acpi tablets with brcmfmac43430a1 wifi adapters,
the newly added re-probe on resume fails like this:

 brcmfmac: brcmf_sdio_bus_rxctl: resumed on timeout
 ieee80211 phy1: brcmf_bus_started: failed: -110
 ieee80211 phy1: brcmf_attach: dongle is not responding: err=-110
 brcmfmac: brcmf_sdio_firmware_callback: brcmf_attach failed

It seems this specific brcmfmac model does not like being reprobed without
it actually being turned off first.

And the adapter is not being turned off during suspend because of
commit f0992ace68 ("brcmfmac: prohibit ACPI power management for brcmfmac
driver").

Now that the driver is being reprobed on resume, the disabling of ACPI
pm is no longer necessary, except when WOWL is used (in which case there
is no-reprobe).

Move the dis-/en-abling of ACPI pm to brcmf_sdio_wowl_config(), this fixes
the brcmfmac43430a1 suspend/resume regression and should help save some
power when suspended.

This change means that the code now also may re-enable ACPI pm when WOWL
gets disabled. ACPI pm should only be re-enabled if it was enabled by
the ACPI core originally. Add a brcmf_sdiod_acpi_save_power_manageable()
to save the original state for this.

This has been tested on the following devices:

Asus T100TA                brcmfmac43241b4-sdio
Acer Iconia One 7 B1-750   brcmfmac43340-sdio
Chuwi Hi8                  brcmfmac43430a0-sdio
Chuwi Hi8                  brcmfmac43430a1-sdio

(the Asus T100TA is the device for which the prohibiting of ACPI pm
 was originally added)

Fixes: 92cadedd9d ("brcmfmac: Avoid keeping power to SDIO card unless WOWL is used")
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230320122252.240070-1-hdegoede@redhat.com

drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c

@@ -994,15 +994,34 @@ static const struct sdio_device_id brcmf_sdmmc_ids[] = {
 MODULE_DEVICE_TABLE(sdio, brcmf_sdmmc_ids);
 
 
-static void brcmf_sdiod_acpi_set_power_manageable(struct device *dev,
+static void brcmf_sdiod_acpi_save_power_manageable(struct brcmf_sdio_dev *sdiodev)
-						  int val)
 {
 #if IS_ENABLED(CONFIG_ACPI)
 	struct acpi_device *adev;
 
-	adev = ACPI_COMPANION(dev);
+	adev = ACPI_COMPANION(&sdiodev->func1->dev);
 	if (adev)
-		adev->flags.power_manageable = 0;
+		sdiodev->func1_power_manageable = adev->flags.power_manageable;
+
+	adev = ACPI_COMPANION(&sdiodev->func2->dev);
+	if (adev)
+		sdiodev->func2_power_manageable = adev->flags.power_manageable;
+#endif
+}
+
+static void brcmf_sdiod_acpi_set_power_manageable(struct brcmf_sdio_dev *sdiodev,
+						  int enable)
+{
+#if IS_ENABLED(CONFIG_ACPI)
+	struct acpi_device *adev;
+
+	adev = ACPI_COMPANION(&sdiodev->func1->dev);
+	if (adev)
+		adev->flags.power_manageable = enable ? sdiodev->func1_power_manageable : 0;
+
+	adev = ACPI_COMPANION(&sdiodev->func2->dev);
+	if (adev)
+		adev->flags.power_manageable = enable ? sdiodev->func2_power_manageable : 0;
 #endif
 }
 
@@ -1012,7 +1031,6 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func,
 	int err;
 	struct brcmf_sdio_dev *sdiodev;
 	struct brcmf_bus *bus_if;
-	struct device *dev;
 
 	brcmf_dbg(SDIO, "Enter\n");
 	brcmf_dbg(SDIO, "Class=%x\n", func->class);
@@ -1020,14 +1038,9 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func,
 	brcmf_dbg(SDIO, "sdio device ID: 0x%04x\n", func->device);
 	brcmf_dbg(SDIO, "Function#: %d\n", func->num);
 
-	dev = &func->dev;
-
 	/* Set MMC_QUIRK_LENIENT_FN0 for this card */
 	func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
 
-	/* prohibit ACPI power management for this device */
-	brcmf_sdiod_acpi_set_power_manageable(dev, 0);
-
 	/* Consume func num 1 but dont do anything with it. */
 	if (func->num == 1)
 		return 0;
@@ -1059,6 +1072,7 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func,
 	dev_set_drvdata(&sdiodev->func1->dev, bus_if);
 	sdiodev->dev = &sdiodev->func1->dev;
 
+	brcmf_sdiod_acpi_save_power_manageable(sdiodev);
 	brcmf_sdiod_change_state(sdiodev, BRCMF_SDIOD_DOWN);
 
 	brcmf_dbg(SDIO, "F2 found, calling brcmf_sdiod_probe...\n");
@@ -1124,6 +1138,8 @@ void brcmf_sdio_wowl_config(struct device *dev, bool enabled)
 
 	if (sdiodev->settings->bus.sdio.oob_irq_supported ||
 	    pm_caps & MMC_PM_WAKE_SDIO_IRQ) {
+		/* Stop ACPI from turning off the device when wowl is enabled */
+		brcmf_sdiod_acpi_set_power_manageable(sdiodev, !enabled);
 		sdiodev->wowl_enabled = enabled;
 		brcmf_dbg(SDIO, "Configuring WOWL, enabled=%d\n", enabled);
 		return;

drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h

@@ -188,6 +188,8 @@ struct brcmf_sdio_dev {
 	char nvram_name[BRCMF_FW_NAME_LEN];
 	char clm_name[BRCMF_FW_NAME_LEN];
 	bool wowl_enabled;
+	bool func1_power_manageable;
+	bool func2_power_manageable;
 	enum brcmf_sdiod_state state;
 	struct brcmf_sdiod_freezer *freezer;
 	const struct firmware *clm_fw;