From: Grygorii Strashko <grygorii.strashko@ti.com>
To: Kishon Vijay Abraham I <kishon@ti.com>, <tony@atomide.com>,
<ulf.hansson@linaro.org>, <afenkart@gmail.com>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-omap@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mmc@vger.kernel.org>
Cc: <nsekhar@ti.com>, Roger Quadros <rogerq@ti.com>
Subject: Re: [PATCH 01/17] mmc: host: omap_hsmmc: use devm_regulator_get_optional() for vmmc
Date: Wed, 29 Jul 2015 15:09:09 +0300 [thread overview]
Message-ID: <55B8C265.1050801@ti.com> (raw)
In-Reply-To: <1438168187-1614-2-git-send-email-kishon@ti.com>
On 07/29/2015 02:09 PM, Kishon Vijay Abraham I wrote:
> Since vmmc can be optional for some platforms, use
> devm_regulator_get_optional() for vmmc. Now return error only
> in the case of -EPROBE_DEFER and for all other cases set
> host->vcc to NULL.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
> drivers/mmc/host/omap_hsmmc.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 4d12032..b673e59 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -344,11 +344,13 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
> struct regulator *reg;
> int ocr_value = 0;
>
> - reg = devm_regulator_get(host->dev, "vmmc");
> + reg = devm_regulator_get_optional(host->dev, "vmmc");
> if (IS_ERR(reg)) {
> - dev_err(host->dev, "unable to get vmmc regulator %ld\n",
> + if (PTR_ERR(reg) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + host->vcc = NULL;
> + dev_dbg(host->dev, "unable to get vmmc regulator %ld\n",
> PTR_ERR(reg));
> - return PTR_ERR(reg);
I think, It could be unsafe to just drop this return.
regulator_get_optional may return:
1 valid pointer on regulator : success;
2 ERR_PTR(-ENODEV) : regulator is not assigned, can proceed.
3 ERR_PTR(-EPROBE_DEFER) : regulator is assigned, but not ready yet, retry.
4 ERR_PTR(<other error codes>: regulator is assigned, but can't be retrieved, failure, can't proceed
So, It's allowed to continue with host->vcc = NULL; only in case [2], while
in case [4] probe should fail.
> } else {
> host->vcc = reg;
> ocr_value = mmc_regulator_get_ocrmask(reg);
>
--
regards,
-grygorii
WARNING: multiple messages have this Message-ID (diff)
From: Grygorii Strashko <grygorii.strashko-l0cyMroinI0@public.gmane.org>
To: Kishon Vijay Abraham I <kishon-l0cyMroinI0@public.gmane.org>,
tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org,
ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org,
afenkart-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: nsekhar-l0cyMroinI0@public.gmane.org,
Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>
Subject: Re: [PATCH 01/17] mmc: host: omap_hsmmc: use devm_regulator_get_optional() for vmmc
Date: Wed, 29 Jul 2015 15:09:09 +0300 [thread overview]
Message-ID: <55B8C265.1050801@ti.com> (raw)
In-Reply-To: <1438168187-1614-2-git-send-email-kishon-l0cyMroinI0@public.gmane.org>
On 07/29/2015 02:09 PM, Kishon Vijay Abraham I wrote:
> Since vmmc can be optional for some platforms, use
> devm_regulator_get_optional() for vmmc. Now return error only
> in the case of -EPROBE_DEFER and for all other cases set
> host->vcc to NULL.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon-l0cyMroinI0@public.gmane.org>
> ---
> drivers/mmc/host/omap_hsmmc.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 4d12032..b673e59 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -344,11 +344,13 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
> struct regulator *reg;
> int ocr_value = 0;
>
> - reg = devm_regulator_get(host->dev, "vmmc");
> + reg = devm_regulator_get_optional(host->dev, "vmmc");
> if (IS_ERR(reg)) {
> - dev_err(host->dev, "unable to get vmmc regulator %ld\n",
> + if (PTR_ERR(reg) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + host->vcc = NULL;
> + dev_dbg(host->dev, "unable to get vmmc regulator %ld\n",
> PTR_ERR(reg));
> - return PTR_ERR(reg);
I think, It could be unsafe to just drop this return.
regulator_get_optional may return:
1 valid pointer on regulator : success;
2 ERR_PTR(-ENODEV) : regulator is not assigned, can proceed.
3 ERR_PTR(-EPROBE_DEFER) : regulator is assigned, but not ready yet, retry.
4 ERR_PTR(<other error codes>: regulator is assigned, but can't be retrieved, failure, can't proceed
So, It's allowed to continue with host->vcc = NULL; only in case [2], while
in case [4] probe should fail.
> } else {
> host->vcc = reg;
> ocr_value = mmc_regulator_get_ocrmask(reg);
>
--
regards,
-grygorii
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WARNING: multiple messages have this Message-ID (diff)
From: grygorii.strashko@ti.com (Grygorii Strashko)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 01/17] mmc: host: omap_hsmmc: use devm_regulator_get_optional() for vmmc
Date: Wed, 29 Jul 2015 15:09:09 +0300 [thread overview]
Message-ID: <55B8C265.1050801@ti.com> (raw)
In-Reply-To: <1438168187-1614-2-git-send-email-kishon@ti.com>
On 07/29/2015 02:09 PM, Kishon Vijay Abraham I wrote:
> Since vmmc can be optional for some platforms, use
> devm_regulator_get_optional() for vmmc. Now return error only
> in the case of -EPROBE_DEFER and for all other cases set
> host->vcc to NULL.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
> drivers/mmc/host/omap_hsmmc.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 4d12032..b673e59 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -344,11 +344,13 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
> struct regulator *reg;
> int ocr_value = 0;
>
> - reg = devm_regulator_get(host->dev, "vmmc");
> + reg = devm_regulator_get_optional(host->dev, "vmmc");
> if (IS_ERR(reg)) {
> - dev_err(host->dev, "unable to get vmmc regulator %ld\n",
> + if (PTR_ERR(reg) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + host->vcc = NULL;
> + dev_dbg(host->dev, "unable to get vmmc regulator %ld\n",
> PTR_ERR(reg));
> - return PTR_ERR(reg);
I think, It could be unsafe to just drop this return.
regulator_get_optional may return:
1 valid pointer on regulator : success;
2 ERR_PTR(-ENODEV) : regulator is not assigned, can proceed.
3 ERR_PTR(-EPROBE_DEFER) : regulator is assigned, but not ready yet, retry.
4 ERR_PTR(<other error codes>: regulator is assigned, but can't be retrieved, failure, can't proceed
So, It's allowed to continue with host->vcc = NULL; only in case [2], while
in case [4] probe should fail.
> } else {
> host->vcc = reg;
> ocr_value = mmc_regulator_get_ocrmask(reg);
>
--
regards,
-grygorii
next prev parent reply other threads:[~2015-07-29 12:10 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-29 11:09 [PATCH 00/17] omap_hsmmc: regulator usage cleanup and fixes Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 01/17] mmc: host: omap_hsmmc: use devm_regulator_get_optional() for vmmc Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 12:09 ` Grygorii Strashko [this message]
2015-07-29 12:09 ` Grygorii Strashko
2015-07-29 12:09 ` Grygorii Strashko
2015-07-31 15:29 ` Kishon Vijay Abraham I
2015-07-31 15:29 ` Kishon Vijay Abraham I
2015-07-31 15:29 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 02/17] mmc: host: omap_hsmmc: return error from omap_hsmmc_reg_get on -EPROBE_DEFER Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 03/17] mmc: host: omap_hsmmc: cleanup omap_hsmmc_reg_get() Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 04/17] mmc: host: omap_hsmmc: use the ocrmask provided by the vmmc regulator Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 05/17] mmc: host: omap_hsmmc: use mmc_host's vmmc and vqmmc Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 06/17] mmc: host: omap_hsmmc: remove unnecessary pbias set_voltage Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 07/17] mmc: host: omap_hsmmc: return error if any of the regulator APIs fail Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 08/17] mmc: host: omap_hsmmc: add separate functions for enable/disable supply Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 09/17] mmc: host: omap_hsmmc: add separate function to set pbias Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 10/17] mmc: host: omap_hsmmc: avoid pbias regulator enable on power off Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 11/17] mmc: host: omap_hsmmc: don't use ->set_power to set initial regulator state Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 12/17] ARM: dts: am57xx-beagle-x15: Fix regulator populated in MMC1 dt node Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 19:37 ` Nishanth Menon
2015-07-29 19:37 ` Nishanth Menon
2015-07-29 19:37 ` Nishanth Menon
2015-08-25 6:36 ` Kishon Vijay Abraham I
2015-08-25 6:36 ` Kishon Vijay Abraham I
2015-08-25 6:36 ` Kishon Vijay Abraham I
2015-09-14 17:12 ` Tony Lindgren
2015-09-14 17:12 ` Tony Lindgren
2015-07-29 11:09 ` [PATCH 13/17] mmc: host: omap_hsmmc: enable/disable vmmc_aux regulator based on prior state Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 14/17] mmc: host: omap_hsmmc: use regulator_is_enabled to find pbias status Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 15/17] mmc: host: omap_hsmmc: use ios->vdd for setting vmmc voltage Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 16/17] mmc: host: omap_hsmmc: remove CONFIG_REGULATOR check Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` [PATCH 17/17] mmc: host: omap_hsmmc: use "mmc_of_parse_voltage" to get ocr_avail Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-07-29 11:09 ` Kishon Vijay Abraham I
2015-08-03 7:28 ` [PATCH 00/17] omap_hsmmc: regulator usage cleanup and fixes Andreas Fenkart
2015-08-03 7:28 ` Andreas Fenkart
2015-08-03 7:28 ` Andreas Fenkart
2015-08-03 12:12 ` Kishon Vijay Abraham I
2015-08-03 12:12 ` Kishon Vijay Abraham I
2015-08-03 12:12 ` Kishon Vijay Abraham I
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