From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933580AbdKGAV3 (ORCPT ); Mon, 6 Nov 2017 19:21:29 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:53778 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755508AbdKGAVZ (ORCPT ); Mon, 6 Nov 2017 19:21:25 -0500 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Jiahau Chang" , "Ian Pilcher" , "Greg Kroah-Hartman" , "Mathias Nyman" , "Jiahau Chang" Date: Mon, 06 Nov 2017 23:03:02 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 040/294] xhci: Bad Ethernet performance plugged in ASM1042A host In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.50-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Jiahau Chang commit 9da5a1092b13468839b1a864b126cacfb72ad016 upstream. When USB Ethernet is plugged in ASMEDIA ASM1042A xHCI host, bad performance was manifesting in Web browser use (like download large file such as ISO image). It is known limitation of ASM1042A that is not compatible with driver scheduling, As a workaround we can modify flow control handling of ASM1042A. The register we modify is changes the behavior [use quirk bit 28, usleep_range 40-60us, empty non-pci function -Mathias] Signed-off-by: Jiahau Chang Signed-off-by: Ian Pilcher Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings --- drivers/usb/host/pci-quirks.c | 54 +++++++++++++++++++++++++++++++++++++++++++ drivers/usb/host/pci-quirks.h | 2 ++ drivers/usb/host/xhci-pci.c | 6 +++++ drivers/usb/host/xhci.c | 6 +++++ drivers/usb/host/xhci.h | 1 + 5 files changed, 69 insertions(+) --- a/drivers/usb/host/pci-quirks.c +++ b/drivers/usb/host/pci-quirks.c @@ -78,6 +78,16 @@ #define USB_INTEL_USB3_PSSEN 0xD8 #define USB_INTEL_USB3PRM 0xDC +/* ASMEDIA quirk use */ +#define ASMT_DATA_WRITE0_REG 0xF8 +#define ASMT_DATA_WRITE1_REG 0xFC +#define ASMT_CONTROL_REG 0xE0 +#define ASMT_CONTROL_WRITE_BIT 0x02 +#define ASMT_WRITEREG_CMD 0x10423 +#define ASMT_FLOWCTL_ADDR 0xFA30 +#define ASMT_FLOWCTL_DATA 0xBA +#define ASMT_PSEUDO_DATA 0 + /* * amd_chipset_gen values represent AMD different chipset generations */ @@ -415,6 +425,50 @@ void usb_amd_quirk_pll_disable(void) } EXPORT_SYMBOL_GPL(usb_amd_quirk_pll_disable); +static int usb_asmedia_wait_write(struct pci_dev *pdev) +{ + unsigned long retry_count; + unsigned char value; + + for (retry_count = 1000; retry_count > 0; --retry_count) { + + pci_read_config_byte(pdev, ASMT_CONTROL_REG, &value); + + if (value == 0xff) { + dev_err(&pdev->dev, "%s: check_ready ERROR", __func__); + return -EIO; + } + + if ((value & ASMT_CONTROL_WRITE_BIT) == 0) + return 0; + + usleep_range(40, 60); + } + + dev_warn(&pdev->dev, "%s: check_write_ready timeout", __func__); + return -ETIMEDOUT; +} + +void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev) +{ + if (usb_asmedia_wait_write(pdev) != 0) + return; + + /* send command and address to device */ + pci_write_config_dword(pdev, ASMT_DATA_WRITE0_REG, ASMT_WRITEREG_CMD); + pci_write_config_dword(pdev, ASMT_DATA_WRITE1_REG, ASMT_FLOWCTL_ADDR); + pci_write_config_byte(pdev, ASMT_CONTROL_REG, ASMT_CONTROL_WRITE_BIT); + + if (usb_asmedia_wait_write(pdev) != 0) + return; + + /* send data to device */ + pci_write_config_dword(pdev, ASMT_DATA_WRITE0_REG, ASMT_FLOWCTL_DATA); + pci_write_config_dword(pdev, ASMT_DATA_WRITE1_REG, ASMT_PSEUDO_DATA); + pci_write_config_byte(pdev, ASMT_CONTROL_REG, ASMT_CONTROL_WRITE_BIT); +} +EXPORT_SYMBOL_GPL(usb_asmedia_modifyflowcontrol); + void usb_amd_quirk_pll_enable(void) { usb_amd_quirk_pll(0); --- a/drivers/usb/host/pci-quirks.h +++ b/drivers/usb/host/pci-quirks.h @@ -11,6 +11,7 @@ bool usb_amd_prefetch_quirk(void); void usb_amd_dev_put(void); void usb_amd_quirk_pll_disable(void); void usb_amd_quirk_pll_enable(void); +void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev); void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev); void usb_disable_xhci_ports(struct pci_dev *xhci_pdev); void sb800_prefetch(struct device *dev, int on); @@ -18,6 +19,7 @@ void sb800_prefetch(struct device *dev, struct pci_dev; static inline void usb_amd_quirk_pll_disable(void) {} static inline void usb_amd_quirk_pll_enable(void) {} +static inline void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev) {} static inline void usb_amd_dev_put(void) {} static inline void usb_disable_xhci_ports(struct pci_dev *xhci_pdev) {} static inline void sb800_prefetch(struct device *dev, int on) {} --- a/drivers/usb/host/xhci-pci.c +++ b/drivers/usb/host/xhci-pci.c @@ -52,6 +52,8 @@ #define PCI_DEVICE_ID_AMD_PROMONTORYA_2 0x43bb #define PCI_DEVICE_ID_AMD_PROMONTORYA_1 0x43bc +#define PCI_DEVICE_ID_ASMEDIA_1042A_XHCI 0x1142 + static const char hcd_name[] = "xhci_hcd"; /* called after powerup, by probe or system-pm "wakeup" */ @@ -198,6 +200,10 @@ static void xhci_pci_quirks(struct devic pdev->device == 0x1142) xhci->quirks |= XHCI_TRUST_TX_LENGTH; + if (pdev->vendor == PCI_VENDOR_ID_ASMEDIA && + pdev->device == PCI_DEVICE_ID_ASMEDIA_1042A_XHCI) + xhci->quirks |= XHCI_ASMEDIA_MODIFY_FLOWCONTROL; + if (xhci->quirks & XHCI_RESET_ON_RESUME) xhci_dbg_trace(xhci, trace_xhci_dbg_quirks, "QUIRK: Resetting on resume"); --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -191,6 +191,9 @@ int xhci_reset(struct xhci_hcd *xhci) if (ret) return ret; + if (xhci->quirks & XHCI_ASMEDIA_MODIFY_FLOWCONTROL) + usb_asmedia_modifyflowcontrol(to_pci_dev(xhci_to_hcd(xhci)->self.controller)); + xhci_dbg_trace(xhci, trace_xhci_dbg_init, "Wait for controller to be ready for doorbell rings"); /* @@ -1116,6 +1119,9 @@ int xhci_resume(struct xhci_hcd *xhci, b if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) && !comp_timer_running) compliance_mode_recovery_timer_init(xhci); + if (xhci->quirks & XHCI_ASMEDIA_MODIFY_FLOWCONTROL) + usb_asmedia_modifyflowcontrol(to_pci_dev(hcd->self.controller)); + /* Re-enable port polling. */ xhci_dbg(xhci, "%s: starting port polling.\n", __func__); set_bit(HCD_FLAG_POLL_RH, &hcd->flags); --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1570,6 +1570,7 @@ struct xhci_hcd { #define XHCI_PME_STUCK_QUIRK (1 << 20) #define XHCI_MISSING_CAS (1 << 24) #define XHCI_U2_DISABLE_WAKE (1 << 27) +#define XHCI_ASMEDIA_MODIFY_FLOWCONTROL (1 << 28) unsigned int num_active_eps; unsigned int limit_active_eps; /* There are two roothubs to keep track of bus suspend info for */