From: gregory.clement@free-electrons•com (Gregory CLEMENT)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 2/8] mmc: sdhci-pxav3: disable clock inversion for HS MMC cards
Date: Tue, 06 Oct 2015 16:44:50 +0200 [thread overview]
Message-ID: <87fv1o9hul.fsf@free-electrons.com> (raw)
In-Reply-To: <1444094562-31165-3-git-send-email-mw@semihalf.com> (Marcin Wojtas's message of "Tue, 6 Oct 2015 03:22:36 +0200")
Hi Marcin,
On mar., oct. 06 2015, Marcin Wojtas <mw@semihalf•com> wrote:
> From: Nadav Haklai <nadavh@marvell•com>
>
> According to 'FE-2946959' erratum the clock inversion option is
> needed to support slow frequencies when the card input hold time
> requirement is high. This setting is not required for high speed
> MMC and might cause timing violation.
>
> Signed-off-by: Nadav Haklai <nadavh@marvell•com>
> Cc: <stable@vger•kernel.org> # v4.2
Seems OK too.
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons•com>
Thanks,
Gregory
> ---
> drivers/mmc/host/sdhci-pxav3.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
> index 976cddd..89a9e49 100644
> --- a/drivers/mmc/host/sdhci-pxav3.c
> +++ b/drivers/mmc/host/sdhci-pxav3.c
> @@ -291,6 +291,9 @@ static void pxav3_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
> uhs == MMC_TIMING_UHS_DDR50) {
> reg_val &= ~SDIO3_CONF_CLK_INV;
> reg_val |= SDIO3_CONF_SD_FB_CLK;
> + } else if (uhs == MMC_TIMING_MMC_HS) {
> + reg_val &= ~SDIO3_CONF_CLK_INV;
> + reg_val &= ~SDIO3_CONF_SD_FB_CLK;
> } else {
> reg_val |= SDIO3_CONF_CLK_INV;
> reg_val &= ~SDIO3_CONF_SD_FB_CLK;
> --
> 1.8.3.1
>
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
next prev parent reply other threads:[~2015-10-06 14:44 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-06 1:22 [PATCH 0/8] Armada 38x SDHCI driver improvements Marcin Wojtas
2015-10-06 1:22 ` [PATCH 1/8] mmc: sdhci-pxav3: remove broken clock base quirk for Armada 38x sdhci driver Marcin Wojtas
2015-10-06 14:43 ` Gregory CLEMENT
2015-10-08 17:35 ` Ulf Hansson
2015-10-06 1:22 ` [PATCH 2/8] mmc: sdhci-pxav3: disable clock inversion for HS MMC cards Marcin Wojtas
2015-10-06 14:44 ` Gregory CLEMENT [this message]
2015-10-08 17:35 ` Ulf Hansson
2015-10-06 1:22 ` [PATCH 3/8] mmc: sdhci-pxav3: fix error handling of armada_38x_quirks Marcin Wojtas
2015-10-06 14:47 ` Gregory CLEMENT
2015-10-08 17:35 ` Ulf Hansson
2015-10-09 0:49 ` Marcin Wojtas
2015-10-06 1:22 ` [PATCH 4/8] mmc: sdhci-pxav3: enable proper resuming on Armada 38x SoC Marcin Wojtas
2015-10-06 14:51 ` Gregory CLEMENT
2015-10-06 15:08 ` Marcin Wojtas
2015-10-09 1:09 ` Jisheng Zhang
2015-10-09 9:48 ` Marcin Wojtas
2015-10-06 1:22 ` [PATCH 5/8] mmc: sdhci-pxav3: enable usage of DAT3 pin as HW card detect Marcin Wojtas
2015-10-06 1:22 ` [PATCH 6/8] ARM: mvebu: enable SDHCI card detection using DAT3 pin on A388-GP Marcin Wojtas
2015-10-06 3:31 ` Andrew Lunn
2015-10-06 7:02 ` Marcin Wojtas
2015-10-06 14:45 ` Andrew Lunn
2015-10-06 15:05 ` Marcin Wojtas
2015-10-06 16:23 ` Andrew Lunn
2015-10-06 15:05 ` Gregory CLEMENT
2015-10-06 15:35 ` Marcin Wojtas
2015-10-06 16:20 ` Andrew Lunn
2015-10-06 1:22 ` [PATCH 7/8] mmc: sdhci: add init_card callback to sdhci Marcin Wojtas
2015-10-06 1:22 ` [PATCH 8/8] mmc: sdhci-pxav3: enable modifying MMC_CARD bit during card initialization Marcin Wojtas
2015-10-06 14:43 ` [PATCH 0/8] Armada 38x SDHCI driver improvements Gregory CLEMENT
2015-10-06 15:48 ` Marcin Wojtas
2015-10-08 13:21 ` Marcin Wojtas
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