linux-kernel - Re: [PATCH v3 3/4] mmc: omap_hsmmc: Remux pins to support SDIO interrupt on AM335x

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Date:	Fri, 18 Oct 2013 18:45:52 +1100
From:	NeilBrown <neilb@...e.de>
To:	Balaji T K <balajitk@...com>
Cc:	Andreas Fenkart <afenkart@...il.com>, Chris Ball <cjb@...top.org>,
	Tony Lindgren <tony@...mide.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Felipe Balbi <balbi@...com>, <zonque@...il.com>,
	<devicetree-discuss@...ts.ozlabs.org>,
	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mmc@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v3 3/4] mmc: omap_hsmmc: Remux pins to support SDIO
 interrupt on AM335x

On Fri, 18 Oct 2013 12:59:56 +0530 Balaji T K <balajitk@...com> wrote:

> On Friday 18 October 2013 11:50 AM, NeilBrown wrote:
> > On Sat,  5 Oct 2013 13:17:09 +0200 Andreas Fenkart <afenkart@...il.com> wrote:
> >
> >> The am335x can't detect pending cirq in PM runtime suspend.
> >> This patch reconfigures dat1 as a GPIO before going to suspend.
> >> SDIO interrupts are detected with the GPIO, while in runtime
> >> suspend, standard detection of the module block otherwise.
> >>
> >> Signed-off-by: Andreas Fenkart <afenkart@...il.com>
> >>
> >> diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> >> index 1136e6b..146f3ad 100644
> >> --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> >> +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> >> @@ -21,8 +21,11 @@ ti,non-removable: non-removable slot (like eMMC)
> >>   ti,needs-special-reset: Requires a special softreset sequence
> >>   ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed
> >>   ti,quirk-swakup-missing: SOC missing the swakeup line, will not detect
> >> -SDIO irq while in suspend. Fallback to polling. Affected chips are
> >> -am335x,
> >> +SDIO irq while in suspend. The workaround is to reconfigure the dat1 line as a
> >> +GPIO upon suspend. Beyond this option and the GPIO config, you also need to set
> >> +named pinctrl states "default", "active" and "idle ", see example below.  The
> >> +MMC driver will then then toggle between default and idle during the runtime
> >> +Affected chips are am335x,
> >>
> >>                               ------
> >>                               | PRCM |
> >> @@ -49,3 +52,24 @@ Example:
> >>   		vmmc-supply = <&vmmc>; /* phandle to regulator node */
> >>   		ti,non-removable;
> >>   	};
> >> +
> >> +[am335x with with gpio for sdio irq]
> >> +
> >> +	mmc1_cirq_pin: pinmux_cirq_pin {
> >> +		pinctrl-single,pins = <
> >> +			0x0f8 0x3f	/* MMC0_DAT1 as GPIO2_28 */
> >> +		>;
> >> +	};
> >> +
> >> +	mmc1: mmc@...60000 {
> >> +		ti,non-removable;
> >> +		bus-width = <4>;
> >> +		vmmc-supply = <&ldo2_reg>;
> >> +		vmmc_aux-supply = <&vmmc>;
> >> +	        ti,quirk-swakeup-missing;
> >> +		pinctrl-names = "default", "active", "idle";
> >> +		pinctrl-0 = <&mmc1_pins>;
> >> +		pinctrl-1 = <&mmc1_pins>;
> >> +		pinctrl-2 = <&mmc1_cirq_pin>;
> >> +		ti,cirq-gpio = <&gpio3 28 0>;
> >> +	};
> >
> >
> > hi,
> >   I've been trying to get SD irq to work on my  OMAP3 DM3730.
> > I seems to need the magic to catch interrupts while FCLK is off, as
> > the only way I can get it to work at the moment is to keep FCLK on.
> >
> > I discovered your patch and tried it out, but it doesn't seem to work for me.
> >
> > I have a Libertas WIFI chip attached to the second mmc (which is sometimes
> > called mmc1, and sometimes mmc2 - very confusing!).
> > I added:
> > 	mmc2_cirq_pin: pinmux_cirq_pin {
> > 		pinctrl-single,pins = <
> > 			0x012e (PIN_INPUT_PULLUP | MUX_MODE4)	/* MMC2_DAT1 as GPIO5_5 */
> > 		>;
> > 	};
> >
> > and
> >
> > &mmc2 {
> > 	ti,quirk-swakeup-missing;
> > 	pinctrl-names = "default", "active", "idle";
> > 	pinctrl-0 = <&mmc2_pins>;
> > 	pinctrl-1 = <&mmc2_pins>;
> > 	pinctrl-2 = <&mmc2_cirq_pin>;
> > 	ti,cirq-gpio = <&gpio5 5 0>; /* GPIO133 = 128+5 */
> > };
> >
> > to my dts file but it doesn't make any apparent difference.
> >
> > Any idea what I might be doing wrong?
> > (the base kernel I am applying patches to is from 8th Oct,
> >   commit 0e7a3ed04f0cd4311096d691888f88569310ee6c)
> >
> > BTW,
> >   - with the default polling, I get about 1Mb/sec with iperf
> >   - with sd-irq enabled and FCLK kept on the whole time, I get 4Mb/sec
> >   - with sd-irq enable, FCLK kept on, and the 5ms polling also
> >     running, I get over 5Mb/sec!
> > Still much less than the 40Mb/sec that I would like to get...
> >
> (removing svenkatr@...com)
> 
> Hi,
> 
> Can you check if you have bus-width property set ?
> 	bus-width = <4>;
> 
>
Yes I do.
as well as the settings above I have:

	vmmc-supply = <&vaux4>;
	bus-width = <4>;
	ti,non-removable;
	cap-power-off-card;


vaux4 is from a twl4030 and powers the wifi chip.
'cap-power-off-card' I added support for myself to so the card would power
off when not in use.

Thanks,
NeilBrown

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