linux-kernel - Re: [PATCH v3 13/15] mmc: host: omap_hsmmc: use regulator_is

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Date:	Thu, 27 Aug 2015 18:17:10 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Andreas Fenkart <afenkart@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	linux-omap <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sekhar Nori <nsekhar@...com>, Neil Brown <neilb@...e.de>
Subject: Re: [PATCH v3 13/15] mmc: host: omap_hsmmc: use regulator_is_enabled
 to find pbias status

Hi Uffe,

On Thursday 27 August 2015 06:12 PM, Ulf Hansson wrote:
> On 27 August 2015 at 14:41, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>> On 27 August 2015 at 11:14, Kishon Vijay Abraham I <kishon@...com> wrote:
>>> Use regulator_is_enabled of pbias regulator to find pbias regulator
>>> status instead of maintaining a custom bookkeeping
>>> pbias_enabled variable.
>>
>> Doesn't this cause a problem for the scenario when the initial state
>> of the regulator is enabled?

Patch 11 of this series "mmc: host: omap_hsmmc: don't use ->set_power to
set initial regulator state" disables the pbias regulator if the initial
state of the regulator is enabled.

Thanks
Kishon
>>
>> Both in the sense that you will increase the enable count for it
> 
> /s/will/won't
> 
>> (potentially it may then become disabled when you need it enabled) but
>> also from a enable/disable imbalance point of view.
>>
>> Kind regards
>> Uffe
>>
>>>
>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>> Tested-by: Tony Lindgren <tony@...mide.com>
>>> ---
>>>  drivers/mmc/host/omap_hsmmc.c |    8 ++------
>>>  1 file changed, 2 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
>>> index 5a5946a..4cd7a58 100644
>>> --- a/drivers/mmc/host/omap_hsmmc.c
>>> +++ b/drivers/mmc/host/omap_hsmmc.c
>>> @@ -182,7 +182,6 @@ struct omap_hsmmc_host {
>>>         struct  clk             *fclk;
>>>         struct  clk             *dbclk;
>>>         struct  regulator       *pbias;
>>> -       bool                    pbias_enabled;
>>>         void    __iomem         *base;
>>>         int                     vqmmc_enabled;
>>>         resource_size_t         mapbase;
>>> @@ -330,22 +329,20 @@ static int omap_hsmmc_set_pbias(struct omap_hsmmc_host *host, bool power_on,
>>>                         return ret;
>>>                 }
>>>
>>> -               if (host->pbias_enabled == 0) {
>>> +               if (!regulator_is_enabled(host->pbias)) {
>>>                         ret = regulator_enable(host->pbias);
>>>                         if (ret) {
>>>                                 dev_err(host->dev, "pbias reg enable fail\n");
>>>                                 return ret;
>>>                         }
>>> -                       host->pbias_enabled = 1;
>>>                 }
>>>         } else {
>>> -               if (host->pbias_enabled == 1) {
>>> +               if (regulator_is_enabled(host->pbias)) {
>>>                         ret = regulator_disable(host->pbias);
>>>                         if (ret) {
>>>                                 dev_err(host->dev, "pbias reg disable fail\n");
>>>                                 return ret;
>>>                         }
>>> -                       host->pbias_enabled = 0;
>>>                 }
>>>         }
>>>
>>> @@ -2081,7 +2078,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
>>>         host->base      = base + pdata->reg_offset;
>>>         host->power_mode = MMC_POWER_OFF;
>>>         host->next_data.cookie = 1;
>>> -       host->pbias_enabled = 0;
>>>         host->vqmmc_enabled = 0;
>>>
>>>         ret = omap_hsmmc_gpio_init(mmc, host, pdata);
>>> --
>>> 1.7.9.5
>>>
--
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