lkml.org 
[lkml]   [2018]   [Apr]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH V5 0/2] mmc: sdhci-msm: Configuring IO_PAD support for sdhci-msm
On 20 April 2018 at 14:15, Vijay Viswanath <vviswana@codeaurora.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.
>

\
 
 \ /
  Last update: 2018-04-23 11:19    [W:1.603 / U:0.284 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site