linux-kernel - [RFC PATCH v1 06/13] Bluetooth: hci_bcm4377: Convert aspm disable to quirk

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Message-Id: <20230602114751.19671-7-ilpo.jarvinen@linux.intel.com>
Date:   Fri,  2 Jun 2023 14:47:43 +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>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [RFC PATCH v1 06/13] Bluetooth: hci_bcm4377: Convert aspm disable to quirk

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
hci_bcm4377 driver and add a PCI quirk to disable ASPM.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/bluetooth/hci_bcm4377.c | 20 --------------------
 drivers/pci/quirks.c            |  3 +++
 2 files changed, 3 insertions(+), 20 deletions(-)

diff --git a/drivers/bluetooth/hci_bcm4377.c b/drivers/bluetooth/hci_bcm4377.c
index 19ad0e788646..2348ee2380db 100644
--- a/drivers/bluetooth/hci_bcm4377.c
+++ b/drivers/bluetooth/hci_bcm4377.c
@@ -490,7 +490,6 @@ struct bcm4377_data;
  * clear_pciecfg_subsystem_ctrl_bit19: Set to true if bit 19 in the
  *                                     vendor-specific subsystem control
  *                                     register has to be cleared
- * disable_aspm: Set to true if ASPM must be disabled due to hardware errata
  * broken_ext_scan: Set to true if the chip erroneously claims to support
  *                  extended scanning
  * broken_mws_transport_config: Set to true if the chip erroneously claims to
@@ -509,7 +508,6 @@ struct bcm4377_hw {
 
 	unsigned long has_bar0_core2_window2 : 1;
 	unsigned long clear_pciecfg_subsystem_ctrl_bit19 : 1;
-	unsigned long disable_aspm : 1;
 	unsigned long broken_ext_scan : 1;
 	unsigned long broken_mws_transport_config : 1;
 
@@ -2222,20 +2220,6 @@ static int bcm4377_probe_of(struct bcm4377_data *bcm4377)
 	return 0;
 }
 
-static void bcm4377_disable_aspm(struct bcm4377_data *bcm4377)
-{
-	pci_disable_link_state(bcm4377->pdev,
-			       PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
-
-	/*
-	 * pci_disable_link_state can fail if either CONFIG_PCIEASPM is disabled
-	 * or if the BIOS hasn't handed over control to us. We must *always*
-	 * disable ASPM for this device due to hardware errata though.
-	 */
-	pcie_capability_clear_word(bcm4377->pdev, PCI_EXP_LNKCTL,
-				   PCI_EXP_LNKCTL_ASPMC);
-}
-
 static void bcm4377_pci_free_irq_vectors(void *data)
 {
 	pci_free_irq_vectors(data);
@@ -2288,9 +2272,6 @@ static int bcm4377_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return -ENODEV;
 	}
 
-	if (bcm4377->hw->disable_aspm)
-		bcm4377_disable_aspm(bcm4377);
-
 	ret = pci_reset_function_locked(pdev);
 	if (ret)
 		dev_warn(
@@ -2448,7 +2429,6 @@ static const struct bcm4377_hw bcm4377_hw_variants[] = {
 		.otp_offset = 0x4120,
 		.bar0_window1 = 0x1800b000,
 		.bar0_window2 = 0x1810c000,
-		.disable_aspm = true,
 		.broken_ext_scan = true,
 		.send_ptb = bcm4377_send_ptb,
 	},
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index f4e2a88729fd..25b7d7bcb279 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2407,6 +2407,9 @@ static void quirk_disable_aspm_l0s_l1(struct pci_dev *dev)
  */
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASMEDIA, 0x1080, quirk_disable_aspm_l0s_l1);
 
+/* BCM4377 must always disable ASPM due to hardware errata. */
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM, 0x5fa0, quirk_disable_aspm_l0s_l1);
+
 /*
  * Some Pericom PCIe-to-PCI bridges in reverse mode need the PCIe Retrain
  * Link bit cleared after starting the link retrain process to allow this
-- 
2.30.2