On Sat, May 22, 2021 at 03:18:27PM +0200, Jonas Dreßler wrote: > From: Tsuchiya Yuto <kitakar@xxxxxxxxx> > > This commit adds reset_wsid quirk and uses this quirk for Surface 3 on > card reset. > > To reset mwifiex on Surface 3, it seems that calling the _DSM method > exists in \_SB.WSID [1] device is required. > > On Surface 3, calling the _DSM method removes/re-probes the card by > itself. So, need to place the reset function before performing FLR and > skip performing any other reset-related works. Maybe this is a nit-pick, but I understand "probing" to be something the OS does, namely what we normally call "enumeration," i.e., discovering a device. So it sounds like the _DSM causes a logical hot-removal of the card, which the PCI hotplug driver should notice and it should remove the driver and remove the pci_dev. And the _DSM also causes a hot-add (reading the code below, it looks like this is actually a second _DSM), which the PCI hotplug driver should also notice and enumerate the bus (i.e., it reads config space looking for a device). This all would cause a new pci_dev to be allocated, resources assigned for its BARs, and the driver .probe() method to be called again? That seems like a lot, so maybe I didn't understand what's actually happening. > Note that Surface Pro 3 also has the WSID device [2], but it seems to need > more work. This commit only supports Surface 3 yet. > > [1] https://github.com/linux-surface/acpidumps/blob/05cba925f3a515f222acb5b3551a032ddde958fe/surface_3/dsdt.dsl#L11947-L12011 > [2] https://github.com/linux-surface/acpidumps/blob/05cba925f3a515f222acb5b3551a032ddde958fe/surface_pro_3/dsdt.dsl#L12164-L12216 > > Signed-off-by: Tsuchiya Yuto <kitakar@xxxxxxxxx> > Signed-off-by: Jonas Dreßler <verdre@xxxxxxx> > --- > drivers/net/wireless/marvell/mwifiex/pcie.c | 10 ++ > .../wireless/marvell/mwifiex/pcie_quirks.c | 91 +++++++++++++++++++ > .../wireless/marvell/mwifiex/pcie_quirks.h | 6 ++ > 3 files changed, 107 insertions(+) > > diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c > index d9acfea395ad..6e049236ae1a 100644 > --- a/drivers/net/wireless/marvell/mwifiex/pcie.c > +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c > @@ -2969,6 +2969,16 @@ static void mwifiex_pcie_card_reset_work(struct mwifiex_adapter *adapter) > { > struct pcie_service_card *card = adapter->card; > > + /* On Surface 3, reset_wsid method removes then re-probes card by > + * itself. So, need to place it here and skip performing any other > + * reset-related works. > + */ > + if (card->quirks & QUIRK_FW_RST_WSID_S3) { > + mwifiex_pcie_reset_wsid_quirk(card->dev); > + /* skip performing any other reset-related works */ > + return; > + } > + > /* We can't afford to wait here; remove() might be waiting on us. If we > * can't grab the device lock, maybe we'll get another chance later. > */ > diff --git a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c > index b5f214fc1212..f0a6fa0a7ae5 100644 > --- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c > +++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c > @@ -9,10 +9,21 @@ > * down, or causes NULL ptr deref). > */ > > +#include <linux/acpi.h> > #include <linux/dmi.h> > > #include "pcie_quirks.h" > > +/* For reset_wsid quirk */ > +#define ACPI_WSID_PATH "\\_SB.WSID" > +#define WSID_REV 0x0 > +#define WSID_FUNC_WIFI_PWR_OFF 0x1 > +#define WSID_FUNC_WIFI_PWR_ON 0x2 > +/* WSID _DSM UUID: "534ea3bf-fcc2-4e7a-908f-a13978f0c7ef" */ > +static const guid_t wsid_dsm_guid = > + GUID_INIT(0x534ea3bf, 0xfcc2, 0x4e7a, > + 0x90, 0x8f, 0xa1, 0x39, 0x78, 0xf0, 0xc7, 0xef); > + > /* quirk table based on DMI matching */ > static const struct dmi_system_id mwifiex_quirk_table[] = { > { > @@ -81,6 +92,22 @@ static const struct dmi_system_id mwifiex_quirk_table[] = { > }, > .driver_data = (void *)QUIRK_FW_RST_D3COLD, > }, > + { > + .ident = "Surface 3", > + .matches = { > + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), > + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface 3"), > + }, > + .driver_data = (void *)QUIRK_FW_RST_WSID_S3, > + }, > + { > + .ident = "Surface Pro 3", > + .matches = { > + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), > + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 3"), > + }, > + .driver_data = 0, > + }, > {} > }; > > @@ -97,6 +124,9 @@ void mwifiex_initialize_quirks(struct pcie_service_card *card) > dev_info(&pdev->dev, "no quirks enabled\n"); > if (card->quirks & QUIRK_FW_RST_D3COLD) > dev_info(&pdev->dev, "quirk reset_d3cold enabled\n"); > + if (card->quirks & QUIRK_FW_RST_WSID_S3) > + dev_info(&pdev->dev, > + "quirk reset_wsid for Surface 3 enabled\n"); > } > > static void mwifiex_pcie_set_power_d3cold(struct pci_dev *pdev) > @@ -153,3 +183,64 @@ int mwifiex_pcie_reset_d3cold_quirk(struct pci_dev *pdev) > > return 0; > } > + > +int mwifiex_pcie_reset_wsid_quirk(struct pci_dev *pdev) > +{ > + acpi_handle handle; > + union acpi_object *obj; > + acpi_status status; > + > + dev_info(&pdev->dev, "Using reset_wsid quirk to perform FW reset\n"); > + > + status = acpi_get_handle(NULL, ACPI_WSID_PATH, &handle); > + if (ACPI_FAILURE(status)) { > + dev_err(&pdev->dev, "No ACPI handle for path %s\n", > + ACPI_WSID_PATH); > + return -ENODEV; > + } > + > + if (!acpi_has_method(handle, "_DSM")) { > + dev_err(&pdev->dev, "_DSM method not found\n"); > + return -ENODEV; > + } > + > + if (!acpi_check_dsm(handle, &wsid_dsm_guid, > + WSID_REV, WSID_FUNC_WIFI_PWR_OFF)) { > + dev_err(&pdev->dev, > + "_DSM method doesn't support wifi power off func\n"); > + return -ENODEV; > + } > + > + if (!acpi_check_dsm(handle, &wsid_dsm_guid, > + WSID_REV, WSID_FUNC_WIFI_PWR_ON)) { > + dev_err(&pdev->dev, > + "_DSM method doesn't support wifi power on func\n"); > + return -ENODEV; > + } > + > + /* card will be removed immediately after this call on Surface 3 */ > + dev_info(&pdev->dev, "turning wifi off...\n"); > + obj = acpi_evaluate_dsm(handle, &wsid_dsm_guid, > + WSID_REV, WSID_FUNC_WIFI_PWR_OFF, > + NULL); > + if (!obj) { > + dev_err(&pdev->dev, > + "device _DSM execution failed for turning wifi off\n"); > + return -EIO; > + } > + ACPI_FREE(obj); > + > + /* card will be re-probed immediately after this call on Surface 3 */ > + dev_info(&pdev->dev, "turning wifi on...\n"); > + obj = acpi_evaluate_dsm(handle, &wsid_dsm_guid, > + WSID_REV, WSID_FUNC_WIFI_PWR_ON, > + NULL); > + if (!obj) { > + dev_err(&pdev->dev, > + "device _DSM execution failed for turning wifi on\n"); > + return -EIO; > + } > + ACPI_FREE(obj); > + > + return 0; > +} > diff --git a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h > index 549093067813..d90ada3f2daa 100644 > --- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h > +++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h > @@ -7,5 +7,11 @@ > > #define QUIRK_FW_RST_D3COLD BIT(0) > > +/* Surface 3 and Surface Pro 3 have the same _DSM method but need to > + * be handled differently. Currently, only S3 is supported. > + */ > +#define QUIRK_FW_RST_WSID_S3 BIT(1) > + > void mwifiex_initialize_quirks(struct pcie_service_card *card); > int mwifiex_pcie_reset_d3cold_quirk(struct pci_dev *pdev); > +int mwifiex_pcie_reset_wsid_quirk(struct pci_dev *pdev); > -- > 2.31.1 >
