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Message-Id: <20230602114751.19671-8-ilpo.jarvinen@linux.intel.com>
Date: Fri, 2 Jun 2023 14:47:44 +0300
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Rob Herring <robh@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Lukas Wunner <lukas@...ner.de>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Heiner Kallweit <hkallweit1@...il.com>,
Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
Felix Fietkau <nbd@....name>,
Lorenzo Bianconi <lorenzo@...nel.org>,
Ryder Lee <ryder.lee@...iatek.com>,
Shayne Chen <shayne.chen@...iatek.com>,
Sean Wang <sean.wang@...iatek.com>,
Kalle Valo <kvalo@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [RFC PATCH v1 07/13] mt76: Remove unreliable pci_disable_link_state() workaround
pci_disable_link_state() was made reliable regardless of ASPM CONFIG
and OS being disallowed to change ASPM states to allow drivers to rely
on pci_disable_link_state() working.
Remove driver working around unreliable pci_disable_link_state() from
mt76 driver and just call pci_disable_link_state() directly.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
It's a bit unclear which of these devices really need ASPM disabled.
Probably all 76xx given the commit messages that added their disabling
but 79xx seems a lot more uncertain and handwavy.
mt7915 was done without observing any issue in commit 03b3dedc5de1
("mt76: mt7915: disable ASPM").
mt7921 re-enabled aspm in bf3747ae2e25 ("mt76: mt7921: enable aspm by
default").
mt7996 was added with aspm disabled.
I didn't convert these to quirk due to how unclear the situation
currently is (but for 76xx quirk would seem justified as there is
actually some evidence to back aspm being harmful).
---
drivers/net/wireless/mediatek/mt76/Makefile | 1 -
drivers/net/wireless/mediatek/mt76/mt76.h | 1 -
.../net/wireless/mediatek/mt76/mt7615/pci.c | 2 +-
.../net/wireless/mediatek/mt76/mt76x0/pci.c | 2 +-
.../net/wireless/mediatek/mt76/mt76x2/pci.c | 2 +-
.../net/wireless/mediatek/mt76/mt7915/pci.c | 2 +-
.../net/wireless/mediatek/mt76/mt7921/pci.c | 2 +-
.../net/wireless/mediatek/mt76/mt7996/pci.c | 2 +-
drivers/net/wireless/mediatek/mt76/pci.c | 47 -------------------
9 files changed, 6 insertions(+), 55 deletions(-)
delete mode 100644 drivers/net/wireless/mediatek/mt76/pci.c
diff --git a/drivers/net/wireless/mediatek/mt76/Makefile b/drivers/net/wireless/mediatek/mt76/Makefile
index 84c99b7e57f9..220e711840d3 100644
--- a/drivers/net/wireless/mediatek/mt76/Makefile
+++ b/drivers/net/wireless/mediatek/mt76/Makefile
@@ -10,7 +10,6 @@ mt76-y := \
mmio.o util.o trace.o dma.o mac80211.o debugfs.o eeprom.o \
tx.o agg-rx.o mcu.o
-mt76-$(CONFIG_PCI) += pci.o
mt76-$(CONFIG_NL80211_TESTMODE) += testmode.o
mt76-usb-y := usb.o usb_trace.o
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 6b07b8fafec2..9beee339782e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -933,7 +933,6 @@ bool ____mt76_poll_msec(struct mt76_dev *dev, u32 offset, u32 mask, u32 val,
#define mt76_poll_msec_tick(dev, ...) ____mt76_poll_msec(&((dev)->mt76), __VA_ARGS__)
void mt76_mmio_init(struct mt76_dev *dev, void __iomem *regs);
-void mt76_pci_disable_aspm(struct pci_dev *pdev);
static inline u16 mt76_chip(struct mt76_dev *dev)
{
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/pci.c b/drivers/net/wireless/mediatek/mt76/mt7615/pci.c
index 9f43e673518b..d43efe4bf9e3 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/pci.c
@@ -43,7 +43,7 @@ static int mt7615_pci_probe(struct pci_dev *pdev,
if (ret)
goto error;
- mt76_pci_disable_aspm(pdev);
+ pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
map = id->device == 0x7663 ? mt7663e_reg_map : mt7615e_reg_map;
ret = mt7615_mmio_probe(&pdev->dev, pcim_iomap_table(pdev)[0],
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x0/pci.c b/drivers/net/wireless/mediatek/mt76/mt76x0/pci.c
index 9277ff38b7a2..49c7a63cb1f6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x0/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x0/pci.c
@@ -181,7 +181,7 @@ mt76x0e_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (ret)
return ret;
- mt76_pci_disable_aspm(pdev);
+ pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
mdev = mt76_alloc_device(&pdev->dev, sizeof(*dev), &mt76x0e_ops,
&drv_ops);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c b/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c
index df85ebc6e1df..de6eb593ab59 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c
@@ -85,7 +85,7 @@ mt76x2e_probe(struct pci_dev *pdev, const struct pci_device_id *id)
/* RG_SSUSB_CDR_BR_PE1D = 0x3 */
mt76_rmw_field(dev, 0x15c58, 0x3 << 6, 0x3);
- mt76_pci_disable_aspm(pdev);
+ pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
return 0;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/pci.c b/drivers/net/wireless/mediatek/mt76/mt7915/pci.c
index 39132894e8ea..8cf9a1a6d851 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/pci.c
@@ -122,7 +122,7 @@ static int mt7915_pci_probe(struct pci_dev *pdev,
if (ret)
return ret;
- mt76_pci_disable_aspm(pdev);
+ pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
if (id->device == 0x7916 || id->device == 0x790a)
return mt7915_pci_hif2_probe(pdev);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
index ddb1fa4ee01d..c9862e808cbb 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -286,7 +286,7 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
goto err_free_pci_vec;
if (mt7921_disable_aspm)
- mt76_pci_disable_aspm(pdev);
+ pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
ops = mt7921_get_mac80211_ops(&pdev->dev, (void *)id->driver_data,
&features);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/pci.c b/drivers/net/wireless/mediatek/mt76/mt7996/pci.c
index 64aee3fb5445..273b72c58878 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/pci.c
@@ -111,7 +111,7 @@ static int mt7996_pci_probe(struct pci_dev *pdev,
if (ret)
return ret;
- mt76_pci_disable_aspm(pdev);
+ pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
if (id->device == 0x7991)
return mt7996_pci_hif2_probe(pdev);
diff --git a/drivers/net/wireless/mediatek/mt76/pci.c b/drivers/net/wireless/mediatek/mt76/pci.c
deleted file mode 100644
index 4c1c159fbb62..000000000000
--- a/drivers/net/wireless/mediatek/mt76/pci.c
+++ /dev/null
@@ -1,47 +0,0 @@
-// SPDX-License-Identifier: ISC
-/*
- * Copyright (C) 2019 Lorenzo Bianconi <lorenzo@...nel.org>
- */
-
-#include "mt76.h"
-#include <linux/pci.h>
-
-void mt76_pci_disable_aspm(struct pci_dev *pdev)
-{
- struct pci_dev *parent = pdev->bus->self;
- u16 aspm_conf, parent_aspm_conf = 0;
-
- pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &aspm_conf);
- aspm_conf &= PCI_EXP_LNKCTL_ASPMC;
- if (parent) {
- pcie_capability_read_word(parent, PCI_EXP_LNKCTL,
- &parent_aspm_conf);
- parent_aspm_conf &= PCI_EXP_LNKCTL_ASPMC;
- }
-
- if (!aspm_conf && (!parent || !parent_aspm_conf)) {
- /* aspm already disabled */
- return;
- }
-
- dev_info(&pdev->dev, "disabling ASPM %s %s\n",
- (aspm_conf & PCI_EXP_LNKCTL_ASPM_L0S) ? "L0s" : "",
- (aspm_conf & PCI_EXP_LNKCTL_ASPM_L1) ? "L1" : "");
-
- if (IS_ENABLED(CONFIG_PCIEASPM)) {
- int err;
-
- err = pci_disable_link_state(pdev, aspm_conf);
- if (!err)
- return;
- }
-
- /* both device and parent should have the same ASPM setting.
- * disable ASPM in downstream component first and then upstream.
- */
- pcie_capability_clear_word(pdev, PCI_EXP_LNKCTL, aspm_conf);
- if (parent)
- pcie_capability_clear_word(parent, PCI_EXP_LNKCTL,
- aspm_conf);
-}
-EXPORT_SYMBOL_GPL(mt76_pci_disable_aspm);
--
2.30.2
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