From: Marek Vasut <marex@denx.de>
To: Yann Gautier <yann.gautier@foss.st.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
Russell King <linux@armlinux.org.uk>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Linus Walleij <linus.walleij@linaro.org>,
Vladimir Zapolskiy <vz@mleia.com>,
u.kleine-koenig@pengutronix.de,
Christophe Kerello <christophe.kerello@foss.st.com>,
Ludovic Barre <ludovic.barre@foss.st.com>,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 4/4] mmc: mmci: add hs200 support for stm32 sdmmc
Date: Thu, 16 Dec 2021 11:15:22 +0100 [thread overview]
Message-ID: <7137d4a9-6830-959d-1222-e63f5f618859@denx.de> (raw)
In-Reply-To: <b7ef5887-ce9e-9ba1-5819-765e68104cc5@foss.st.com>
On 12/16/21 10:44, Yann Gautier wrote:
> On 12/16/21 10:14 AM, Marek Vasut wrote:
>> On 12/15/21 15:17, Yann Gautier wrote:
>>> Use feedback clock for HS200 mode, as for SDR104.
>>> The HS200 mode can be enabled through DT by using mmc-hs200-1_8v.
>>> It is possible to use it on STM32MP13, but not STM32MP15 platforms.
>>
>> HS200 is possible even on the MP15, it just doesn't yield any
>> (performance) benefits due to the slower bus clock (125 MHz or so?),
>> so it isn't worth enabling it on MP15. It is nice to see MP13 can do
>> better.
>
> Hi Marek,
>
> There is a limitation on MP15, please see errata sheet [1], chapter 2.3.19.
> HS200 (and SDR104) shouldn't be enabled on MP15.
>
> Best regards,
> Yann
>
> [1] https://www.st.com/resource/en/errata_sheet/dm00516256.pdf
Oh, I see, so I was lucky to even ever get it working at all.
Thanks for the info.
next prev parent reply other threads:[~2021-12-16 10:15 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-15 14:17 [PATCH 0/4] mmc: mmci: updates for STM32MP13 Yann Gautier
2021-12-15 14:17 ` [PATCH 1/4] mmc: mmci: Add support for sdmmc variant revision v2.2 Yann Gautier
2021-12-15 14:17 ` [PATCH 2/4] mmc: mmci: increase stm32 sdmmcv2 clock max freq Yann Gautier
2021-12-15 14:17 ` [PATCH 3/4] mmc: mmci: stm32: clear DLYB_CR after sending tuning command Yann Gautier
2021-12-16 9:13 ` Marek Vasut
2021-12-16 9:48 ` Yann Gautier
2021-12-21 13:02 ` Ulf Hansson
2021-12-15 14:17 ` [PATCH 4/4] mmc: mmci: add hs200 support for stm32 sdmmc Yann Gautier
2021-12-16 9:14 ` Marek Vasut
2021-12-16 9:44 ` Yann Gautier
2021-12-16 10:15 ` Marek Vasut [this message]
2021-12-16 3:23 ` [PATCH 0/4] mmc: mmci: updates for STM32MP13 Linus Walleij
2021-12-21 13:02 ` Ulf Hansson
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