From: Adrian Hunter <adrian.hunter-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: Gregory CLEMENT
<gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Cc: Ulf Hansson <ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Jason Cooper <jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org>,
Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>,
Sebastian Hesselbarth
<sebastian.hesselbarth-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Thomas Petazzoni
<thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Nadav Haklai <nadavh-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
Victor Gu <xigu-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
Romain Perier
<romain.perier-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
Omri Itach <omrii-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
Marcin Wojtas <mw-nYOzD4b6Jr9Wk0Htik3J/w@public.gmane.org>,
Wilson Ding <dingwei-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>,
Shadi Ammouri <shadi-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
Subject: Re: [PATCH 05/12] mmc: sdhci: add a pre voltage switch callback function
Date: Mon, 13 Jun 2016 11:46:20 +0300 [thread overview]
Message-ID: <575E72DC.5090604@intel.com> (raw)
In-Reply-To: <1465456218-28354-6-git-send-email-gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
On 09/06/16 10:10, Gregory CLEMENT wrote:
> From: Victor Gu <xigu-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
>
> Some host controller such as Xenon needs additional setting when
> switching signal voltage in eMMC mode. They also need to re-enable
> internal clock before a voltage switch.
>
> This commit adds a callback routine "voltage_switch_pre" in the struct
> sdhci_ops, which is used by some host controllers which need re-enable
> the internal clock before a voltage switch.
Don't want to add sdhci host ops for the "do something before a mmc host op"
case.
Instead, export sdhci_start_signal_voltage_switch() and hook
host->mmc_host_ops.start_signal_voltage_switch. Then in sdhci-xenon.c:
int xenon__start_signal_voltage_switch(struct mmc_host *mmc,
struct mmc_ios *ios)
{
blah blah
return sdhci_start_signal_voltage_switch(mmc, ios);
}
>
> [gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org: split the initial commit and
> reformulate the log]
>
> Signed-off-by: Victor Gu <xigu-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
> Signed-off-by: Marcin Wojtas <mw-nYOzD4b6Jr9Wk0Htik3J/w@public.gmane.org>
> Signed-off-by: Gregory CLEMENT <gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> ---
> drivers/mmc/host/sdhci.c | 4 ++++
> drivers/mmc/host/sdhci.h | 1 +
> 2 files changed, 5 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index b07219426d39..cad03ffa9d9b 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1729,6 +1729,10 @@ static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
> if (host->version < SDHCI_SPEC_300)
> return 0;
>
> + /* Some controller need to do more before switching */
> + if (host->ops->voltage_switch_pre)
> + host->ops->voltage_switch_pre(host);
> +
> ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>
> switch (ios->signal_voltage) {
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 49c6c5b0e33b..6bec1b0368d2 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -550,6 +550,7 @@ struct sdhci_ops {
> unsigned int max_dtr, int host_drv,
> int card_drv, int *drv_type);
> void (*init_card)(struct sdhci_host *host, struct mmc_card *card);
> + void (*voltage_switch_pre)(struct sdhci_host *host);
> };
>
> #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
>
--
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next prev parent reply other threads:[~2016-06-13 8:46 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-09 7:10 [PATCH 00/12] Add SDHCI Xenon driver Gregory CLEMENT
[not found] ` <1465456218-28354-1-git-send-email-gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2016-06-09 7:10 ` [PATCH 01/12] mmc: sdhci: add init_card callback to sdhci Gregory CLEMENT
2016-06-13 8:32 ` Adrian Hunter
2016-06-14 7:58 ` Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 10/12] arm64: dts: marvell: add eMMC support for Armada 37xx Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 02/12] mmc: sdhci_f_sdh30: restrict voltage_switch() callback to the 1.8V case Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 03/12] mmc: tegra: restrict the " Gregory CLEMENT
2016-06-09 9:54 ` Lucas Stach
2016-06-09 12:27 ` Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 04/12] mmc: sdhci: call voltage_switch callback also for the 3.3V case Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 05/12] mmc: sdhci: add a pre voltage switch callback function Gregory CLEMENT
[not found] ` <1465456218-28354-6-git-send-email-gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2016-06-13 8:46 ` Adrian Hunter [this message]
[not found] ` <575E72DC.5090604-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-06-13 14:04 ` Ziji Hu
[not found] ` <D7CF8A19-9181-4A97-90AF-AC5A6517CE2B-eYqpPyKDWXRBDgjK7y7TUQ@public.gmane.org>
2016-06-14 7:07 ` Adrian Hunter
2016-06-14 7:59 ` Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 06/12] mmc: sdhci: add delay adjust feature including phy reset Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 07/12] mmc: core: export the alive operation Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 08/12] dt-bindings: mmc: Add Xenon description Gregory CLEMENT
2016-06-10 14:16 ` Rob Herring
2016-06-14 8:02 ` Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 09/12] mmc: sdhci-xenon: add initial Xenon eMMC driver Gregory CLEMENT
2016-06-09 13:45 ` kbuild test robot
2016-06-09 14:33 ` Gregory CLEMENT
2016-06-09 14:20 ` kbuild test robot
2016-06-09 14:54 ` Gregory CLEMENT
[not found] ` <87r3c6mmyp.fsf-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2016-06-09 21:49 ` Arnd Bergmann
2016-06-14 6:52 ` Adrian Hunter
2016-06-14 8:19 ` Gregory CLEMENT
[not found] ` <878ty8chdr.fsf-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2016-06-14 8:36 ` Adrian Hunter
2016-06-22 11:04 ` Ulf Hansson
2016-06-09 7:10 ` [PATCH 11/12] arm64: dts: marvell: add SDIO support for Armada 37xx Gregory CLEMENT
2016-06-09 7:10 ` [PATCH 12/12] arm64: defconfig: Add Xenon sdhci Gregory CLEMENT
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