linux-kernel - RE: [PATCH 2/2] regulator: core: Ensure we are at least in bounds for our constraints

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Date:	Wed, 30 Mar 2016 09:07:21 +0000
From:	Haibo Chen <haibo.chen@....com>
To:	Mark Brown <broonie@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Bjorn Andersson <bjorn@...o.se>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	"linux-renesas-soc@...r.kernel.org" 
	<linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH 2/2] regulator: core: Ensure we are at least in bounds for
 our constraints

Hi Brown,

I also meet the similar issue on i.MX6 platforms.

With your patch   ---> regulator: core: Ensure we are at least in bounds for our constraints
When I insert an SD3.0 card, shows the following log:

root@...6qdlsolo:~# [   59.733941] sdhci-esdhc-imx 2190000.usdhc: could not set regulator OCR (-22)
[   60.829911] sdhci-esdhc-imx 2190000.usdhc: could not set regulator OCR (-22)
[   61.917951] sdhci-esdhc-imx 2190000.usdhc: could not set regulator OCR (-22)
[   63.009498] sdhci-esdhc-imx 2190000.usdhc: could not set regulator OCR (-22)

I did a quick debug, and find when I change the operator   &&  to  !=  , this issue gone.
-       if (constraints->min_uV != constraints->max_uV) {
+       if (constraints->min_uV && constraints->max_uV) {


In our sdhci.c, we call the function 
regulator_set_voltage ---> regulator_set_voltage_unlocked(struct regulator *regulator, int min_uV, int max_uV)
here, the parameter min_uV is 3300000, and the max_uV is 3400000

currently with your patch (the upper operator is &&), when insert a SD3.0 card, 
it will do the sanity check, and return -EINVAL

but when I change the upper operator from && to !=, 
before the sanity check, it will first get the current_uV, and then go to out.

I'm not familiar with regulator common code. Hope the upper describe can help you debug this issue.

The following attach our dts piece code.

126 &usdhc1 {
127         pinctrl-names = "default", "state_100mhz", "state_200mhz";
128         pinctrl-0 = <&pinctrl_usdhc1>;
129         pinctrl-1 = <&pinctrl_usdhc1_100mhz>;
130         pinctrl-2 = <&pinctrl_usdhc1_200mhz>;
131         cd-gpios = <&gpio1 19 GPIO_ACTIVE_LOW>;
132         keep-power-in-suspend;
133         wakeup-source;
134         vmmc-supply = <&reg_sd1_vmmc>;
135         status = "okay";
136 };

regulators {
 26                 compatible = "simple-bus";
 27                 #address-cells = <1>;
 28                 #size-cells = <0>;
 29
 30                 reg_sd1_vmmc: sd1_regulator {
 31                         compatible = "regulator-fixed";
 32                         regulator-name = "VSD_3V3";
 33                         regulator-min-microvolt = <3300000>;
 34                         regulator-max-microvolt = <3300000>;
 35                         gpio = <&gpio1 9 GPIO_ACTIVE_HIGH>;
 36                         enable-active-high;
 37                 };
 38         };

Best Regards
Haibo Chen



> -----Original Message-----
> From: linux-mmc-owner@...r.kernel.org [mailto:linux-mmc-
> owner@...r.kernel.org] On Behalf Of Mark Brown
> Sent: Wednesday, March 30, 2016 2:27 AM
> To: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Bjorn Andersson <bjorn@...o.se>; Krzysztof Kozlowski
> <k.kozlowski@...sung.com>; Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>;
> Liam Girdwood <lgirdwood@...il.com>; linux-kernel@...r.kernel.org; Ulf
> Hansson <ulf.hansson@...aro.org>; linux-mmc <linux-mmc@...r.kernel.org>;
> linux-samsung-soc <linux-samsung-soc@...r.kernel.org>; Javier Martinez
> Canillas <javier@....samsung.com>; Marek Szyprowski
> <m.szyprowski@...sung.com>; linux-renesas-soc@...r.kernel.org
> Subject: Re: [PATCH 2/2] regulator: core: Ensure we are at least in bounds for
> our constraints
> 
> On Tue, Mar 29, 2016 at 08:05:34PM +0200, Geert Uytterhoeven wrote:
> 
> >         sh_mobile_sdhi ee100000.sd: Got WP GPIO ======> sh_mobile_sdhi
> > ee100000.sd: could not set regulator OCR (-22)
> >         gpio_rcar e6055400.gpio: sense irq = 6, type = 3
> >         sh_mobile_sdhi ee100000.sd: mmc0 base at 0xee100000 clock rate
> > 97 MHz
> 
> > The line marked with the arrow is introduced by the changed check, and
> > looks to be the origin of the failure.
> 
> This isn't making any sense.  Why would a change in how we apply voltage
> constraints on initial probe of the regulator have an impact here?  The changed
> code shouldn't even be executing at the point where the SDHCI driver is trying
> to use the regulator.  There's something else going on here.