[RFC PATCH 2/3] mwifiex: pcie: add reset_d3cold quirk for Surface gen4+ devices
From: Tsuchiya Yuto <hidden>
Date: 2020-10-28 21:33:56
Also in:
linux-wireless, lkml
Subsystem:
marvell mwifiex wireless driver, the rest · Maintainers:
Brian Norris, Linus Torvalds
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)
Signed-off-by: Tsuchiya Yuto <redacted>
---
Current issue:
* After reset with this quirk, ASPM settings don't get restored.
Below is the "sudo lspci -nnvvv" diff before/after fw reset on Surface Book 1:
#
# 03:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. 88W8897 [AVASTAR] 802.11ac Wireless [11ab:2b38]
#
@@ -574,9 +574,9 @@
Capabilities: [168 v1] L1 PM Substates
L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
PortCommonModeRestoreTime=70us PortTPowerOnTime=10us
- L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+
- T_CommonMode=0us LTR1.2_Threshold=163840ns
- L1SubCtl2: T_PwrOn=44us
+ L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
+ T_CommonMode=0us LTR1.2_Threshold=0ns
+ L1SubCtl2: T_PwrOn=10us
Kernel driver in use: mwifiex_pcie
Kernel modules: mwifiex_pcie
#
# no changes on root port of wifi regarding ASPM
#
As you see, all of the L1 substates are disabled after fw reset. LTR
value is also changed.
drivers/net/wireless/marvell/mwifiex/pcie.c | 7 ++
.../wireless/marvell/mwifiex/pcie_quirks.c | 73 +++++++++++++++++--
.../wireless/marvell/mwifiex/pcie_quirks.h | 3 +-
3 files changed, 74 insertions(+), 9 deletions(-)
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c b/drivers/net/wireless/marvell/mwifiex/pcie.c
index 362cf10debfa0..c0c4b5a9149ab 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c@@ -529,6 +529,13 @@ 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__); }
diff --git a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c
index 929aee2b0a60a..edc739c542fea 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.c@@ -21,7 +21,7 @@ static const struct dmi_system_id mwifiex_quirk_table[] = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 4"), }, - .driver_data = 0, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, }, { .ident = "Surface Pro 5",
@@ -30,7 +30,7 @@ static const struct dmi_system_id mwifiex_quirk_table[] = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1796"), }, - .driver_data = 0, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, }, { .ident = "Surface Pro 5 (LTE)",
@@ -39,7 +39,7 @@ static const struct dmi_system_id mwifiex_quirk_table[] = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1807"), }, - .driver_data = 0, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, }, { .ident = "Surface Pro 6",
@@ -47,7 +47,7 @@ static const struct dmi_system_id mwifiex_quirk_table[] = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 6"), }, - .driver_data = 0, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, }, { .ident = "Surface Book 1",
@@ -55,7 +55,7 @@ static const struct dmi_system_id mwifiex_quirk_table[] = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book"), }, - .driver_data = 0, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, }, { .ident = "Surface Book 2",
@@ -63,7 +63,7 @@ static const struct dmi_system_id mwifiex_quirk_table[] = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 2"), }, - .driver_data = 0, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, }, { .ident = "Surface Laptop 1",
@@ -71,7 +71,7 @@ static const struct dmi_system_id mwifiex_quirk_table[] = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop"), }, - .driver_data = 0, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, }, { .ident = "Surface Laptop 2",
@@ -79,7 +79,7 @@ static const struct dmi_system_id mwifiex_quirk_table[] = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop 2"), }, - .driver_data = 0, + .driver_data = (void *)QUIRK_FW_RST_D3COLD, }, { .ident = "Surface 3",
@@ -111,4 +111,61 @@ 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); +} + +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); + + 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 5326ae7e56713..8b9dcb5070d87 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h
+++ b/drivers/net/wireless/marvell/mwifiex/pcie_quirks.h@@ -6,6 +6,7 @@ #include "pcie.h" /* quirks */ -// quirk flags can be added here +#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);
--
2.29.1