* [PATCH v2 0/2] ARM: ohci-at91: Add support to forcibly suspend ports while sleep @ 2016-06-01 4:29 Wenyou Yang 2016-06-01 4:29 ` [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend Wenyou Yang 2016-06-01 4:30 ` [PATCH v2 2/2] ARM: at91/dt: sama5d2: Use new compatible for ohci node Wenyou Yang 0 siblings, 2 replies; 6+ messages in thread From: Wenyou Yang @ 2016-06-01 4:29 UTC (permalink / raw) To: Alan Stern, Greg Kroah-Hartman, Nicolas Ferre, Rob Herring, Pawel Moll, Mark Brown, Ian Campbell, Kumar Gala, Alexandre Belloni Cc: linux-kernel, devicetree, linux-arm-kernel, linux-usb, Wenyou Yang To save the power consumption, add a new compatible to support forcibly suspend the USB PORTA/B/C via OHCI Interrupt Configuration SFR Register. Changes in v2: - Add compatible to support forcibly suspend the ports. - Add soc/at91/at91_sfr.h to accommodate the defines. - Add error checking for .sfr_regmap. - Remove unnecessary regmap_read() statement. - Use the new compatible for ohci-node. Wenyou Yang (2): usb: ohci-at91: Forcibly suspend ports while USB suspend ARM: at91/dt: sama5d2: Use new compatible for ohci node .../devicetree/bindings/usb/atmel-usb.txt | 5 +- arch/arm/boot/dts/sama5d2.dtsi | 2 +- drivers/usb/host/ohci-at91.c | 80 +++++++++++++++++++++- include/soc/at91/at91_sfr.h | 29 ++++++++ 4 files changed, 112 insertions(+), 4 deletions(-) create mode 100644 include/soc/at91/at91_sfr.h -- 2.7.4 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend 2016-06-01 4:29 [PATCH v2 0/2] ARM: ohci-at91: Add support to forcibly suspend ports while sleep Wenyou Yang @ 2016-06-01 4:29 ` Wenyou Yang 2016-06-03 1:54 ` Rob Herring 2016-06-01 4:30 ` [PATCH v2 2/2] ARM: at91/dt: sama5d2: Use new compatible for ohci node Wenyou Yang 1 sibling, 1 reply; 6+ messages in thread From: Wenyou Yang @ 2016-06-01 4:29 UTC (permalink / raw) To: Alan Stern, Greg Kroah-Hartman, Nicolas Ferre, Rob Herring, Pawel Moll, Mark Brown, Ian Campbell, Kumar Gala, Alexandre Belloni Cc: linux-kernel, devicetree, linux-arm-kernel, linux-usb, Wenyou Yang In order to the save power consumption, as a workaround, suspend forcibly the USB PORTA/B/C via set the SUSPEND_A/B/C bits of OHCI Interrupt Configuration Register in the SFRs while OHCI USB suspend. This suspend operation must be done before the USB clock is disabled, resume after the USB clock is enabled. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> --- Changes in v2: - Add compatible to support forcibly suspend the ports. - Add soc/at91/at91_sfr.h to accommodate the defines. - Add error checking for .sfr_regmap. - Remove unnecessary regmap_read() statement. .../devicetree/bindings/usb/atmel-usb.txt | 5 +- drivers/usb/host/ohci-at91.c | 80 +++++++++++++++++++++- include/soc/at91/at91_sfr.h | 29 ++++++++ 3 files changed, 111 insertions(+), 3 deletions(-) create mode 100644 include/soc/at91/at91_sfr.h diff --git a/Documentation/devicetree/bindings/usb/atmel-usb.txt b/Documentation/devicetree/bindings/usb/atmel-usb.txt index 5883b73..3e3e58a 100644 --- a/Documentation/devicetree/bindings/usb/atmel-usb.txt +++ b/Documentation/devicetree/bindings/usb/atmel-usb.txt @@ -3,8 +3,9 @@ Atmel SOC USB controllers OHCI Required properties: - - compatible: Should be "atmel,at91rm9200-ohci" for USB controllers - used in host mode. + - compatible: Should be one of the following + "atmel,at91rm9200-ohci" for USB controllers used in host mode. + "atmel,sama5d2-ohci" for SAMA5D2 which can force to suspend. - reg: Address and length of the register set for the device - interrupts: Should contain ehci interrupt - clocks: Should reference the peripheral, host and system clocks diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c index d177372..54e8feb 100644 --- a/drivers/usb/host/ohci-at91.c +++ b/drivers/usb/host/ohci-at91.c @@ -21,8 +21,11 @@ #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/mfd/syscon.h> +#include <linux/regmap.h> #include <linux/usb.h> #include <linux/usb/hcd.h> +#include <soc/at91/at91_sfr.h> #include "ohci.h" @@ -45,12 +48,18 @@ struct at91_usbh_data { u8 overcurrent_changed[AT91_MAX_USBH_PORTS]; }; +struct ohci_at91_caps { + bool suspend_ctrl; +}; + struct ohci_at91_priv { struct clk *iclk; struct clk *fclk; struct clk *hclk; bool clocked; bool wakeup; /* Saved wake-up state for resume */ + const struct ohci_at91_caps *caps; + struct regmap *sfr_regmap; }; /* interface and function clocks; sometimes also an AHB clock */ @@ -132,6 +141,17 @@ static void at91_stop_hc(struct platform_device *pdev) /*-------------------------------------------------------------------------*/ +struct regmap *at91_dt_syscon_sfr(void) +{ + struct regmap *regmap; + + regmap = syscon_regmap_lookup_by_compatible("atmel,sama5d2-sfr"); + if (IS_ERR(regmap)) + regmap = NULL; + + return regmap; +} + static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *); /* configure so an HC device and id are always provided */ @@ -197,6 +217,17 @@ static int usb_hcd_at91_probe(const struct hc_driver *driver, goto err; } + ohci_at91->caps = (const struct ohci_at91_caps *) + of_device_get_match_data(&pdev->dev); + if (!ohci_at91->caps) + return -ENODEV; + + if (ohci_at91->caps->suspend_ctrl) { + ohci_at91->sfr_regmap = at91_dt_syscon_sfr(); + if (!ohci_at91->sfr_regmap) + dev_warn(dev, "failed to find sfr node\n"); + } + board = hcd->self.controller->platform_data; ohci = hcd_to_ohci(hcd); ohci->num_ports = board->ports; @@ -440,8 +471,17 @@ static irqreturn_t ohci_hcd_at91_overcurrent_irq(int irq, void *data) return IRQ_HANDLED; } +static const struct ohci_at91_caps at91rm9200_caps = { + .suspend_ctrl = false, +}; + +static const struct ohci_at91_caps sama5d2_caps = { + .suspend_ctrl = true, +}; + static const struct of_device_id at91_ohci_dt_ids[] = { - { .compatible = "atmel,at91rm9200-ohci" }, + { .compatible = "atmel,at91rm9200-ohci", .data = &at91rm9200_caps }, + { .compatible = "atmel,sama5d2-ohci", .data = &sama5d2_caps }, { /* sentinel */ } }; @@ -581,6 +621,38 @@ static int ohci_hcd_at91_drv_remove(struct platform_device *pdev) return 0; } +static int ohci_at91_port_ctrl(struct regmap *regmap, bool enable) +{ + u32 regval; + int ret; + + if (!regmap) + return -EINVAL; + + ret = regmap_read(regmap, SFR_OHCIICR, ®val); + if (ret) + return ret; + + if (enable) + regval &= ~SFR_OHCIICR_USB_SUSPEND; + else + regval |= SFR_OHCIICR_USB_SUSPEND; + + regmap_write(regmap, SFR_OHCIICR, regval); + + return 0; +} + +static int ohci_at91_port_suspend(struct regmap *regmap) +{ + return ohci_at91_port_ctrl(regmap, false); +} + +static int ohci_at91_port_resume(struct regmap *regmap) +{ + return ohci_at91_port_ctrl(regmap, true); +} + static int __maybe_unused ohci_hcd_at91_drv_suspend(struct device *dev) { @@ -618,6 +690,9 @@ ohci_hcd_at91_drv_suspend(struct device *dev) ohci_writel(ohci, ohci->hc_control, &ohci->regs->control); ohci->rh_state = OHCI_RH_HALTED; + if (ohci_at91->caps->suspend_ctrl) + ohci_at91_port_suspend(ohci_at91->sfr_regmap); + /* flush the writes */ (void) ohci_readl (ohci, &ohci->regs->control); at91_stop_clock(ohci_at91); @@ -637,6 +712,9 @@ ohci_hcd_at91_drv_resume(struct device *dev) at91_start_clock(ohci_at91); + if (ohci_at91->caps->suspend_ctrl) + ohci_at91_port_resume(ohci_at91->sfr_regmap); + ohci_resume(hcd, false); return 0; } diff --git a/include/soc/at91/at91_sfr.h b/include/soc/at91/at91_sfr.h new file mode 100644 index 0000000..04a3a1e --- /dev/null +++ b/include/soc/at91/at91_sfr.h @@ -0,0 +1,29 @@ +/* + * Header file for the Atmel DDR/SDR SDRAM Controller + * + * Copyright (C) 2016 Atmel Corporation + * + * Author: Wenyou Yang <wenyou.yang@atmel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ +#ifndef __AT91_SFR_H__ +#define __AT91_SFR_H__ + +#define SFR_DDRCFG 0x04 /* DDR Configuration Register */ +/* 0x08 ~ 0x0c: Reserved */ +#define SFR_OHCIICR 0x10 /* OHCI Interrupt Configuration Register */ +#define SFR_OHCIISR 0x14 /* OHCI Interrupt Status Register */ + +#define SFR_OHCIICR_SUSPEND_A BIT(8) +#define SFR_OHCIICR_SUSPEND_B BIT(9) +#define SFR_OHCIICR_SUSPEND_C BIT(10) + +#define SFR_OHCIICR_USB_SUSPEND (SFR_OHCIICR_SUSPEND_A | \ + SFR_OHCIICR_SUSPEND_B | \ + SFR_OHCIICR_SUSPEND_C) + +#endif -- 2.7.4 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend 2016-06-01 4:29 ` [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend Wenyou Yang @ 2016-06-03 1:54 ` Rob Herring 2016-06-03 9:22 ` Yang, Wenyou 0 siblings, 1 reply; 6+ messages in thread From: Rob Herring @ 2016-06-03 1:54 UTC (permalink / raw) To: Wenyou Yang Cc: Alan Stern, Greg Kroah-Hartman, Nicolas Ferre, Pawel Moll, Mark Brown, Ian Campbell, Kumar Gala, Alexandre Belloni, linux-kernel, devicetree, linux-arm-kernel, linux-usb On Wed, Jun 01, 2016 at 12:29:59PM +0800, Wenyou Yang wrote: > In order to the save power consumption, as a workaround, suspend > forcibly the USB PORTA/B/C via set the SUSPEND_A/B/C bits of OHCI > Interrupt Configuration Register in the SFRs while OHCI USB suspend. > > This suspend operation must be done before the USB clock is disabled, > resume after the USB clock is enabled. > > Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> > --- > > Changes in v2: > - Add compatible to support forcibly suspend the ports. > - Add soc/at91/at91_sfr.h to accommodate the defines. > - Add error checking for .sfr_regmap. > - Remove unnecessary regmap_read() statement. > > .../devicetree/bindings/usb/atmel-usb.txt | 5 +- > drivers/usb/host/ohci-at91.c | 80 +++++++++++++++++++++- > include/soc/at91/at91_sfr.h | 29 ++++++++ > 3 files changed, 111 insertions(+), 3 deletions(-) > create mode 100644 include/soc/at91/at91_sfr.h > > diff --git a/Documentation/devicetree/bindings/usb/atmel-usb.txt b/Documentation/devicetree/bindings/usb/atmel-usb.txt > index 5883b73..3e3e58a 100644 > --- a/Documentation/devicetree/bindings/usb/atmel-usb.txt > +++ b/Documentation/devicetree/bindings/usb/atmel-usb.txt > @@ -3,8 +3,9 @@ Atmel SOC USB controllers > OHCI > > Required properties: > - - compatible: Should be "atmel,at91rm9200-ohci" for USB controllers > - used in host mode. > + - compatible: Should be one of the following > + "atmel,at91rm9200-ohci" for USB controllers used in host mode. > + "atmel,sama5d2-ohci" for SAMA5D2 which can force to suspend. That may be why you need this now, but that is irrelevant to having a chip specific compatible string. Rob ^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend 2016-06-03 1:54 ` Rob Herring @ 2016-06-03 9:22 ` Yang, Wenyou 2016-06-03 13:32 ` Nicolas Ferre 0 siblings, 1 reply; 6+ messages in thread From: Yang, Wenyou @ 2016-06-03 9:22 UTC (permalink / raw) To: Rob Herring Cc: Alan Stern, Greg Kroah-Hartman, Ferre, Nicolas, Pawel Moll, Mark Brown, Ian Campbell, Kumar Gala, Alexandre Belloni, linux-kernel, devicetree, linux-arm-kernel, linux-usb > -----Original Message----- > From: Rob Herring [mailto:robh@kernel.org] > Sent: 2016年6月3日 9:54 > To: Yang, Wenyou <Wenyou.Yang@atmel.com> > Cc: Alan Stern <stern@rowland.harvard.edu>; Greg Kroah-Hartman > <gregkh@linuxfoundation.org>; Ferre, Nicolas <Nicolas.FERRE@atmel.com>; > Pawel Moll <pawel.moll@arm.com>; Mark Brown <broonie@kernel.org>; Ian > Campbell <ijc+devicetree@hellion.org.uk>; Kumar Gala <galak@codeaurora.org>; > Alexandre Belloni <alexandre.belloni@free-electrons.com>; linux- > kernel@vger.kernel.org; devicetree@vger.kernel.org; linux-arm- > kernel@lists.infradead.org; linux-usb@vger.kernel.org > Subject: Re: [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB > suspend > > On Wed, Jun 01, 2016 at 12:29:59PM +0800, Wenyou Yang wrote: > > In order to the save power consumption, as a workaround, suspend > > forcibly the USB PORTA/B/C via set the SUSPEND_A/B/C bits of OHCI > > Interrupt Configuration Register in the SFRs while OHCI USB suspend. > > > > This suspend operation must be done before the USB clock is disabled, > > resume after the USB clock is enabled. > > > > Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> > > --- > > > > Changes in v2: > > - Add compatible to support forcibly suspend the ports. > > - Add soc/at91/at91_sfr.h to accommodate the defines. > > - Add error checking for .sfr_regmap. > > - Remove unnecessary regmap_read() statement. > > > > .../devicetree/bindings/usb/atmel-usb.txt | 5 +- > > drivers/usb/host/ohci-at91.c | 80 +++++++++++++++++++++- > > include/soc/at91/at91_sfr.h | 29 ++++++++ > > 3 files changed, 111 insertions(+), 3 deletions(-) create mode > > 100644 include/soc/at91/at91_sfr.h > > > > diff --git a/Documentation/devicetree/bindings/usb/atmel-usb.txt > > b/Documentation/devicetree/bindings/usb/atmel-usb.txt > > index 5883b73..3e3e58a 100644 > > --- a/Documentation/devicetree/bindings/usb/atmel-usb.txt > > +++ b/Documentation/devicetree/bindings/usb/atmel-usb.txt > > @@ -3,8 +3,9 @@ Atmel SOC USB controllers OHCI > > > > Required properties: > > - - compatible: Should be "atmel,at91rm9200-ohci" for USB controllers > > - used in host mode. > > + - compatible: Should be one of the following > > + "atmel,at91rm9200-ohci" for USB controllers used in host mode. > > + "atmel,sama5d2-ohci" for SAMA5D2 which can force to suspend. > > That may be why you need this now, but that is irrelevant to having a chip specific > compatible string. Maybe a property is better. Best Regards, Wenyou Yang ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend 2016-06-03 9:22 ` Yang, Wenyou @ 2016-06-03 13:32 ` Nicolas Ferre 0 siblings, 0 replies; 6+ messages in thread From: Nicolas Ferre @ 2016-06-03 13:32 UTC (permalink / raw) To: Yang, Wenyou, Rob Herring Cc: Alan Stern, Greg Kroah-Hartman, Pawel Moll, Mark Brown, Ian Campbell, Kumar Gala, Alexandre Belloni, linux-kernel, devicetree, linux-arm-kernel, linux-usb Le 03/06/2016 11:22, Yang, Wenyou a écrit : >> -----Original Message----- >> From: Rob Herring [mailto:robh@kernel.org] >> Sent: 2016年6月3日 9:54 >> To: Yang, Wenyou <Wenyou.Yang@atmel.com> >> Cc: Alan Stern <stern@rowland.harvard.edu>; Greg Kroah-Hartman >> <gregkh@linuxfoundation.org>; Ferre, Nicolas <Nicolas.FERRE@atmel.com>; >> Pawel Moll <pawel.moll@arm.com>; Mark Brown <broonie@kernel.org>; Ian >> Campbell <ijc+devicetree@hellion.org.uk>; Kumar Gala <galak@codeaurora.org>; >> Alexandre Belloni <alexandre.belloni@free-electrons.com>; linux- >> kernel@vger.kernel.org; devicetree@vger.kernel.org; linux-arm- >> kernel@lists.infradead.org; linux-usb@vger.kernel.org >> Subject: Re: [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB >> suspend >> >> On Wed, Jun 01, 2016 at 12:29:59PM +0800, Wenyou Yang wrote: >>> In order to the save power consumption, as a workaround, suspend >>> forcibly the USB PORTA/B/C via set the SUSPEND_A/B/C bits of OHCI >>> Interrupt Configuration Register in the SFRs while OHCI USB suspend. >>> >>> This suspend operation must be done before the USB clock is disabled, >>> resume after the USB clock is enabled. >>> >>> Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> >>> --- >>> >>> Changes in v2: >>> - Add compatible to support forcibly suspend the ports. >>> - Add soc/at91/at91_sfr.h to accommodate the defines. >>> - Add error checking for .sfr_regmap. >>> - Remove unnecessary regmap_read() statement. >>> >>> .../devicetree/bindings/usb/atmel-usb.txt | 5 +- >>> drivers/usb/host/ohci-at91.c | 80 +++++++++++++++++++++- >>> include/soc/at91/at91_sfr.h | 29 ++++++++ >>> 3 files changed, 111 insertions(+), 3 deletions(-) create mode >>> 100644 include/soc/at91/at91_sfr.h >>> >>> diff --git a/Documentation/devicetree/bindings/usb/atmel-usb.txt >>> b/Documentation/devicetree/bindings/usb/atmel-usb.txt >>> index 5883b73..3e3e58a 100644 >>> --- a/Documentation/devicetree/bindings/usb/atmel-usb.txt >>> +++ b/Documentation/devicetree/bindings/usb/atmel-usb.txt >>> @@ -3,8 +3,9 @@ Atmel SOC USB controllers OHCI >>> >>> Required properties: >>> - - compatible: Should be "atmel,at91rm9200-ohci" for USB controllers >>> - used in host mode. >>> + - compatible: Should be one of the following >>> + "atmel,at91rm9200-ohci" for USB controllers used in host mode. >>> + "atmel,sama5d2-ohci" for SAMA5D2 which can force to suspend. >> >> That may be why you need this now, but that is irrelevant to having a chip specific >> compatible string. > > Maybe a property is better. It seems that it's not an issue to the binding that Rob is talking about but the description that you used: "for SAMA5D2 which can force suspend". Don't modify it to use a property for this: a compatible sting makes a lot of sense. So just listing the new compatible string is enough. If the "force suspend" is not needed anymore in next product, we will come back to the "atmel,at91rm9200-ohci" compatible string or add a new one if needed... bye, -- Nicolas Ferre ^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v2 2/2] ARM: at91/dt: sama5d2: Use new compatible for ohci node 2016-06-01 4:29 [PATCH v2 0/2] ARM: ohci-at91: Add support to forcibly suspend ports while sleep Wenyou Yang 2016-06-01 4:29 ` [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend Wenyou Yang @ 2016-06-01 4:30 ` Wenyou Yang 1 sibling, 0 replies; 6+ messages in thread From: Wenyou Yang @ 2016-06-01 4:30 UTC (permalink / raw) To: Alan Stern, Greg Kroah-Hartman, Nicolas Ferre, Rob Herring, Pawel Moll, Mark Brown, Ian Campbell, Kumar Gala, Alexandre Belloni Cc: linux-kernel, devicetree, linux-arm-kernel, linux-usb, Wenyou Yang Use compatible "atmel,sama5d2-ohci" to be capable of suspending ports while sleep to save the power consumption. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> --- Changes in v2: - Use the new compatible for ohci-node. arch/arm/boot/dts/sama5d2.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/sama5d2.dtsi b/arch/arm/boot/dts/sama5d2.dtsi index 78996bd..03d6724 100644 --- a/arch/arm/boot/dts/sama5d2.dtsi +++ b/arch/arm/boot/dts/sama5d2.dtsi @@ -232,7 +232,7 @@ }; usb1: ohci@00400000 { - compatible = "atmel,at91rm9200-ohci", "usb-ohci"; + compatible = "atmel,sama5d2-ohci", "usb-ohci"; reg = <0x00400000 0x100000>; interrupts = <41 IRQ_TYPE_LEVEL_HIGH 2>; clocks = <&uhphs_clk>, <&uhphs_clk>, <&uhpck>; -- 2.7.4 ^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2016-06-03 13:32 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2016-06-01 4:29 [PATCH v2 0/2] ARM: ohci-at91: Add support to forcibly suspend ports while sleep Wenyou Yang 2016-06-01 4:29 ` [PATCH v2 1/2] usb: ohci-at91: Forcibly suspend ports while USB suspend Wenyou Yang 2016-06-03 1:54 ` Rob Herring 2016-06-03 9:22 ` Yang, Wenyou 2016-06-03 13:32 ` Nicolas Ferre 2016-06-01 4:30 ` [PATCH v2 2/2] ARM: at91/dt: sama5d2: Use new compatible for ohci node Wenyou Yang
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