Re: [RFC PATCH 2/3] mwifiex: pcie: add reset_d3cold quirk for Surface gen4+ devices
From: Amey Narkhede <hidden>
Date: 2021-05-22 18:44:23
Also in:
linux-pci, linux-wireless, lkml
On 21/05/22 03:18PM, Jonas Dreßler wrote:
From: Tsuchiya Yuto <redacted>
To reset mwifiex on Surface gen4+ (Pro 4 or later gen) devices, it
seems that putting the wifi device into D3cold is required according
to errata.inf file on Windows installation (Windows/INF/errata.inf).
This patch adds a function that performs power-cycle (put into D3cold
then D0) and call the function at the end of reset_prepare().
Note: Need to also reset the parent device (bridge) of wifi on SB1;
it might be because the bridge of wifi always reports it's in D3hot.
When I tried to reset only the wifi device (not touching parent), it gave
the following error and the reset failed:
acpi device:4b: Cannot transition to power state D0 for parent in D3hot
mwifiex_pcie 0000:03:00.0: can't change power state from D3cold to D0 (config space inaccessible)May I know how did you reset only the wifi device when you encountered this error?
quoted hunk ↗ jump to hunk
Signed-off-by: Tsuchiya Yuto <redacted> Signed-off-by: Jonas Dreßler <redacted> --- drivers/net/wireless/marvell/mwifiex/pcie.c | 7 + .../wireless/marvell/mwifiex/pcie_quirks.c | 123 ++++++++++++++++++ .../wireless/marvell/mwifiex/pcie_quirks.h | 3 + 3 files changed, 133 insertions(+)diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c index 02fdce926de5..d9acfea395ad 100644 --- a/drivers/net/wireless/marvell/mwifiex/pcie.c +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c@@ -528,6 +528,13 @@ static void mwifiex_pcie_reset_prepare(struct pci_dev *pdev) mwifiex_shutdown_sw(adapter); clear_bit(MWIFIEX_IFACE_WORK_DEVICE_DUMP, &card->work_flags); clear_bit(MWIFIEX_IFACE_WORK_CARD_RESET, &card->work_flags); + + /* For Surface gen4+ devices, we need to put wifi into D3cold right + * before performing FLR + */ + if (card->quirks & QUIRK_FW_RST_D3COLD) + mwifiex_pcie_reset_d3cold_quirk(pdev); + mwifiex_dbg(adapter, INFO, "%s, successful\n", __func__); card->pci_reset_ongoing = true;diff --git a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c index 4064f99b36ba..b5f214fc1212 100644 --- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c +++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c@@ -15,6 +15,72 @@ /* quirk table based on DMI matching */ static const struct dmi_system_id mwifiex_quirk_table[] = { + { + .ident = "Surface Pro 4", + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 4"), + }, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, + }, + { + .ident = "Surface Pro 5", + .matches = { + /* match for SKU here due to generic product name "Surface Pro" */ + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1796"), + }, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, + }, + { + .ident = "Surface Pro 5 (LTE)", + .matches = { + /* match for SKU here due to generic product name "Surface Pro" */ + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1807"), + }, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, + }, + { + .ident = "Surface Pro 6", + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 6"), + }, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, + }, + { + .ident = "Surface Book 1", + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book"), + }, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, + }, + { + .ident = "Surface Book 2", + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 2"), + }, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, + }, + { + .ident = "Surface Laptop 1", + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop"), + }, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, + }, + { + .ident = "Surface Laptop 2", + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop 2"), + }, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, + }, {} };@@ -29,4 +95,61 @@ void mwifiex_initialize_quirks(struct pcie_service_card *card) if (!card->quirks) dev_info(&pdev->dev, "no quirks enabled\n"); + if (card->quirks & QUIRK_FW_RST_D3COLD) + dev_info(&pdev->dev, "quirk reset_d3cold enabled\n"); +} + +static void mwifiex_pcie_set_power_d3cold(struct pci_dev *pdev) +{ + dev_info(&pdev->dev, "putting into D3cold...\n"); + + pci_save_state(pdev); + if (pci_is_enabled(pdev)) + pci_disable_device(pdev); + pci_set_power_state(pdev, PCI_D3cold); +}
pci_set_power_state with PCI_D3cold state calls pci_bus_set_current_state(dev->subordinate, PCI_D3cold). Maybe this was the reason for the earlier problem you had? Not 100% sure about this though CCing: Alex
+
+static int mwifiex_pcie_set_power_d0(struct pci_dev *pdev)
+{
+ int ret;
+
+ dev_info(&pdev->dev, "putting into D0...\n");
+
+ pci_set_power_state(pdev, PCI_D0);
+ ret = pci_enable_device(pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "pci_enable_device failed\n");
+ return ret;
+ }
+ pci_restore_state(pdev);On the side note just save and restore is enough in this case? What would be the device <-> driver state after the reset as you are calling this on parent_pdev below so that affects other devices on bus? Thanks, Amey
quoted hunk ↗ jump to hunk
+ + return 0; +} + +int mwifiex_pcie_reset_d3cold_quirk(struct pci_dev *pdev) +{ + struct pci_dev *parent_pdev = pci_upstream_bridge(pdev); + int ret; + + /* Power-cycle (put into D3cold then D0) */ + dev_info(&pdev->dev, "Using reset_d3cold quirk to perform FW reset\n"); + + /* We need to perform power-cycle also for bridge of wifi because + * on some devices (e.g. Surface Book 1), the OS for some reasons + * can't know the real power state of the bridge. + * When tried to power-cycle only wifi, the reset failed with the + * following dmesg log: + * "Cannot transition to power state D0 for parent in D3hot". + */ + mwifiex_pcie_set_power_d3cold(pdev); + mwifiex_pcie_set_power_d3cold(parent_pdev); + + ret = mwifiex_pcie_set_power_d0(parent_pdev); + if (ret) + return ret; + ret = mwifiex_pcie_set_power_d0(pdev); + if (ret) + return ret; + + return 0; }diff --git a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h index 7a1fe3b3a61a..549093067813 100644 --- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h +++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h@@ -5,4 +5,7 @@ #include "pcie.h" +#define QUIRK_FW_RST_D3COLD BIT(0) + void mwifiex_initialize_quirks(struct pcie_service_card *card); +int mwifiex_pcie_reset_d3cold_quirk(struct pci_dev *pdev); --2.31.1