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Date: Thu, 24 Mar 2016 15:03:07 +0100
From: Ludovic Desroches <ludovic.desroches@...el.com>
To: Adrian Hunter <adrian.hunter@...el.com>
CC: Krzysztof Kozlowski <k.kozlowski@...sung.com>,
Jisheng Zhang <jszhang@...vell.com>,
Jaehoon Chung <jh80.chung@...sung.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
<ludovic.desroches@...el.com>,
"Ivan T. Ivanov" <ivan.ivanov@...aro.org>,
<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-samsung-soc@...r.kernel.org>
Subject: Re: Warnings for invalid VDD (sdhci-s3c)
Hi,
On Thu, Mar 24, 2016 at 03:11:25PM +0200, Adrian Hunter wrote:
> On 24/03/16 10:42, Krzysztof Kozlowski wrote:
> > On 24.03.2016 17:24, Jisheng Zhang wrote:
> >> Hi,
> >>
> >> On Thu, 24 Mar 2016 17:09:27 +0900 Jaehoon Chung wrote:
> >>
> >>> Hi,
> >>>
> >>> On 03/24/2016 04:58 PM, Jisheng Zhang wrote:
> >>>> Hi,
> >>>>
> >>>> On Thu, 24 Mar 2016 16:28:56 +0900 Krzysztof Kozlowski wrote:
> >>>>
> >>>>> Hi,
> >>>>>
> >>>>> After 918f4cbd4340 ("mmc: sdhci: restore behavior when setting VDD via
> >>>>> external regulator") On Trats2 board I see warnings for invalid VDD
> >>>>> value (2.8V):
> >>>>>
> >>>>> [ 3.119656] ------------[ cut here ]------------
> >>>>> [ 3.119666] WARNING: CPU: 3 PID: 90 at
> >>>>> ../drivers/mmc/host/sdhci.c:1234 sdhci_do_set_ios+0x4cc/0x5e0
> >>>>> [ 3.119669] mmc0: Invalid vdd 0x10
> >>>>
> >>>> Per my understanding, the wrong vdd indicates a wrong ocr, what's the voltage of
> >>>> this host's vmmc regulator?
> >>>
> >>> As i know, it's fixed-voltage with gpio on trats2. It's 2.8V.
> >>> I didn't check this entirely..need to check ocr value.
> >>>
> >>
> >> I may know the reason. the vmmc is 2.8v, then mmc_regulator_get_supply() convert
> >> the value to a ocr as 0x10. The key here is that the 2.8v is invalid in SDHCI
> >> case and isn't accepted by current sdhci driver.
> >
> > Yeah, I already wrote that. It is the part of the warning and my email.
> > Our regulator is fixed at 2.8 which is 0x10. :)
> >
> >> I dunno the elegant solution to handle this case, let's wait for sdhci maintainers
> >> idea.
> >
> > Hmm...
>
> I haven't tested it, but what about this:
>
> From: Adrian Hunter <adrian.hunter@...el.com>
> Date: Thu, 24 Mar 2016 14:29:24 +0200
> Subject: [PATCH] mmc: sdhci: Fix regression setting power on Trats2 board
>
> Several commits relating to setting power have been introducing
> problems by putting driver-specific rules into generic SDHCI code.
>
I remember that I have acked this patch and I still believe it is not
driver-specific code.
Without this patch, if a regulator is used, we set this regulator and we
write SDHCI_POWER_ON to SDHCI_POWER_CONTROL so 0x01. In the
specification, it is said:
'If an unsupported voltage is selected, the Host System shall not supply
SD Bus voltage'.
Valid voltage are 111b for 3.3V, 110b for 3.0V and 101b for 1.8V. 0 is
seen as an invalid voltage.
If the controller strictly applies the specification then it won't perform
the power on request. It's what happens with sdhci-pxav3 and
sdhci-of-at91.
I don't care if the patch is reverted because I no more describe
the regulators but I think the behavior with Jisheng's patch is the right
one. Maybe more cases should be managed in the switch statement as
suggested by Tobias.
> Fix by adding a 'set_power' callback and restoring the default
> behaviour prior to commit 918f4cbd4340. The desired behaviour
> of commit 918f4cbd4340 is gotten by having sdhci-pxav3 provide
> its own set_power callback.
>
Adding callbacks is the only way to solve all these quirks or
interpretations of the specification.
> Reported-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Fixes: 918f4cbd4340 ("mmc: sdhci: restore behavior when setting VDD...)
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> Cc: stable@...r.kernel.org # v4.5+
> ---
> drivers/mmc/host/sdhci-pxav3.c | 17 +++++++++++++++++
> drivers/mmc/host/sdhci.c | 36 +++++++++++++++++++++++++++++-------
> drivers/mmc/host/sdhci.h | 4 ++++
> 3 files changed, 50 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
> index f5edf9d3a18a..673d1e8446a5 100644
> --- a/drivers/mmc/host/sdhci-pxav3.c
> +++ b/drivers/mmc/host/sdhci-pxav3.c
> @@ -307,8 +307,25 @@ static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
> __func__, uhs, ctrl_2);
> }
>
> +static void pxav3_set_power(struct sdhci_host *host, unsigned char mode,
> + unsigned short vdd)
> +{
> + struct mmc_host *mmc = host->mmc;
> + u8 pwr = host->pwr;
> +
> + sdhci_set_power(host, mode, vdd);
> +
> + if (host->pwr == pwr)
> + return;
> +
> + spin_unlock_irq(&host->lock);
> + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
> + spin_lock_irq(&host->lock);
> +}
> +
> static const struct sdhci_ops pxav3_sdhci_ops = {
> .set_clock = sdhci_set_clock,
> + .set_power = pxav3_set_power,
> .platform_send_init_74_clocks = pxav3_gen_init_74_clocks,
> .get_max_clock = sdhci_pltfm_clk_get_max_clock,
> .set_bus_width = sdhci_set_bus_width,
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index add9fdfd1d8f..3c5dc2f73d5e 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1269,10 +1269,24 @@ clock_set:
> }
> EXPORT_SYMBOL_GPL(sdhci_set_clock);
>
> -static void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> +static void sdhci_set_power_reg(struct sdhci_host *host, unsigned char mode,
> unsigned short vdd)
> {
> struct mmc_host *mmc = host->mmc;
> +
> + spin_unlock_irq(&host->lock);
> + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
> + spin_lock_irq(&host->lock);
> +
> + if (mode != MMC_POWER_OFF)
> + sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL);
> + else
> + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
> +}
> +
> +void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> + unsigned short vdd)
> +{
> u8 pwr = 0;
>
> if (mode != MMC_POWER_OFF) {
> @@ -1335,12 +1349,20 @@ static void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> if (host->quirks & SDHCI_QUIRK_DELAY_AFTER_POWER)
> mdelay(10);
> }
> +}
> +EXPORT_SYMBOL_GPL(sdhci_set_power);
>
> - if (!IS_ERR(mmc->supply.vmmc)) {
> - spin_unlock_irq(&host->lock);
> - mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
> - spin_lock_irq(&host->lock);
> - }
> +static void __sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> + unsigned short vdd)
> +{
> + struct mmc_host *mmc = host->mmc;
> +
> + if (host->ops->set_power)
> + host->ops->set_power(host, mode, vdd);
> + else if (!IS_ERR(mmc->supply.vmmc))
> + sdhci_set_power_reg(host, mode, vdd);
> + else
> + sdhci_set_power(host, mode, vdd);
> }
>
> /*****************************************************************************\
> @@ -1490,7 +1512,7 @@ static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
> }
> }
>
> - sdhci_set_power(host, ios->power_mode, ios->vdd);
> + __sdhci_set_power(host, ios->power_mode, ios->vdd);
>
> if (host->ops->platform_send_init_74_clocks)
> host->ops->platform_send_init_74_clocks(host, ios->power_mode);
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 0115e9907bf8..033d72b5bbd5 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -529,6 +529,8 @@ struct sdhci_ops {
> #endif
>
> void (*set_clock)(struct sdhci_host *host, unsigned int clock);
> + void (*set_power)(struct sdhci_host *host, unsigned char mode,
> + unsigned short vdd);
>
> int (*enable_dma)(struct sdhci_host *host);
> unsigned int (*get_max_clock)(struct sdhci_host *host);
> @@ -660,6 +662,8 @@ static inline bool sdhci_sdio_irq_enabled(struct sdhci_host *host)
> }
>
> void sdhci_set_clock(struct sdhci_host *host, unsigned int clock);
> +void sdhci_set_power(struct sdhci_host *host, unsigned char mode,
> + unsigned short vdd);
> void sdhci_set_bus_width(struct sdhci_host *host, int width);
> void sdhci_reset(struct sdhci_host *host, u8 mask);
> void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
> --
> 1.9.1
>
>
>
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