linux-kernel - Re: [PATCH V5 0/2] mmc: sdhci-msm: Configuring IO

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Date:   Mon, 23 Apr 2018 11:18:00 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Vijay Viswanath <vviswana@...eaurora.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Sahitya Tummala <stummala@...eaurora.org>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Pramod Gurav <pramod.gurav@...aro.org>,
        Jeremy McNicoll <jeremymc@...hat.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Harjani Ritesh <riteshh@...eaurora.org>,
        vbadigan@...eaurora.org
Subject: Re: [PATCH V5 0/2] mmc: sdhci-msm: Configuring IO_PAD support for sdhci-msm

On 20 April 2018 at 14:15, Vijay Viswanath <vviswana@...eaurora.org> wrote:
> From the HPG:
> In some platform, SDCC controller can be connected to either an eMMC device or
> an SD card. The PADs for SD card are dual-voltage that support 3v/1.8v. Those
> PADs have a control signal  (io_pad_pwr_switch/mode18 ) that indicates whether
> the PAD works in 3v or 1.8v.
>
> For SD usage the default value of this signal is ‘0’, and SD driver changes it
> to ‘1’ as a part of voltage switching sequence.
> For eMMC usage, SW should configure this signal to ‘1’ and supply 1.8v to PADs
> before starting any activity on the eMMC BUS.
>
> To set this signal, write the following in the
> SDC1_SDCC_HC_VENDOR_SPECIFIC_FUNC register:
>         HC_IO_PAD_PWR_SWITCH: bit 16
>                 HC_IO_PAD_PWR_SWITCH_EN: bit 15
>

Thanks, applied for next!

Kind regards
Uffe

> Changes since v1:
>         Modified comments on io_pad related changes.
>         Split some read+modify+write commands to multiple lines
>
> Changes since v2:
>         IO_PAD_PWR_SWITCH_EN will be set only if we have info regarding what
>         voltage is supported by the regulators.
>         Replaced regulator_list_voltage() API with
>         regulator_is_supported_voltage().
>
> Changes since v3:
>         Removed unnecessary prints and extra lines.
>
> Changes since v4:
>         Removed unnecessary mb() within sdhci_msm_handle_pwr_irq() since
>         wakeup calls have implicit write barriers.
>
> Krishna Konda (1):
>   mmc: sdhci-msm: support voltage pad switching
>
> Vijay Viswanath (1):
>   mmc: sdhci-msm: Add support to store supported vdd-io voltages
>
>  drivers/mmc/host/sdhci-msm.c | 99 +++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 97 insertions(+), 2 deletions(-)
>
> --
>  Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
>