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From: Chen-Yu Tsai <wens@csie.org>
To: "André Przywara" <andre.przywara@arm.com>
Cc: Maxime Ripard <mripard@kernel.org>, Rob Herring <robh@kernel.org>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Icenowy Zheng <icenowy@aosc.io>,
	devicetree <devicetree@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	linux-sunxi <linux-sunxi@googlegroups.com>
Subject: Re: [linux-sunxi] [PATCH 4/7] arm64: dts: allwinner: H6: Allow up to 150 MHz MMC bus frequency
Date: Thu, 7 Jan 2021 00:01:42 +0800	[thread overview]
Message-ID: <CAGb2v64NM9iyYG1x1gvBZ8biwTG-=p1a=WPidyX17sjZTVjt6Q@mail.gmail.com> (raw)
In-Reply-To: <20210106150525.15403-5-andre.przywara@arm.com>

On Wed, Jan 6, 2021 at 11:06 PM Andre Przywara <andre.przywara@arm.com> wrote:
>
> The H6 manual explicitly lists a frequency limit of 150 MHz for the bus
> frequency of the MMC controllers. So far we had no explicit limits in the
> DT, which limited eMMC to a rather conservative 52 MHz.

I'd say this is implementation specific. FreeBSD might have other defaults?

> Put those maximum frequencies in the SoC .dtsi, to allow higher speed
> modes (which still would need to be explicitly enabled, per board).
>
> Tested with an eMMC using HS-200 on a Pine H64. Running at the spec'ed
> 200 MHz indeed fails with I/O errors, but 150 MHz seems to work stably.
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>

Fixes tag?


Thanks
ChenYu

WARNING: multiple messages have this Message-ID (diff)
From: Chen-Yu Tsai <wens@csie.org>
To: "André Przywara" <andre.przywara@arm.com>
Cc: devicetree <devicetree@vger.kernel.org>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Maxime Ripard <mripard@kernel.org>,
	linux-sunxi <linux-sunxi@googlegroups.com>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Icenowy Zheng <icenowy@aosc.io>
Subject: Re: [linux-sunxi] [PATCH 4/7] arm64: dts: allwinner: H6: Allow up to 150 MHz MMC bus frequency
Date: Thu, 7 Jan 2021 00:01:42 +0800	[thread overview]
Message-ID: <CAGb2v64NM9iyYG1x1gvBZ8biwTG-=p1a=WPidyX17sjZTVjt6Q@mail.gmail.com> (raw)
In-Reply-To: <20210106150525.15403-5-andre.przywara@arm.com>

On Wed, Jan 6, 2021 at 11:06 PM Andre Przywara <andre.przywara@arm.com> wrote:
>
> The H6 manual explicitly lists a frequency limit of 150 MHz for the bus
> frequency of the MMC controllers. So far we had no explicit limits in the
> DT, which limited eMMC to a rather conservative 52 MHz.

I'd say this is implementation specific. FreeBSD might have other defaults?

> Put those maximum frequencies in the SoC .dtsi, to allow higher speed
> modes (which still would need to be explicitly enabled, per board).
>
> Tested with an eMMC using HS-200 on a Pine H64. Running at the spec'ed
> 200 MHz indeed fails with I/O errors, but 150 MHz seems to work stably.
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>

Fixes tag?


Thanks
ChenYu

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  reply	other threads:[~2021-01-06 16:03 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-06 15:05 [PATCH 0/7] arm64: dts: allwinner: Various DT fixes Andre Przywara
2021-01-06 15:05 ` Andre Przywara
2021-01-06 15:05 ` [PATCH 1/7] arm64: dts: allwinner: H6/A64: properly connect USB PHY to port 0 Andre Przywara
2021-01-06 15:05   ` Andre Przywara
2021-01-06 15:56   ` [linux-sunxi] " Chen-Yu Tsai
2021-01-06 15:56     ` Chen-Yu Tsai
2021-01-13 10:30     ` André Przywara
2021-01-13 10:30       ` André Przywara
2021-01-13 10:43       ` Chen-Yu Tsai
2021-01-13 10:43         ` Chen-Yu Tsai
2021-01-06 15:05 ` [PATCH 2/7] arm64: dts: allwinner: Pine64-LTS: Add status LED Andre Przywara
2021-01-06 15:05   ` Andre Przywara
2021-01-06 15:53   ` [linux-sunxi] " Chen-Yu Tsai
2021-01-06 15:53     ` Chen-Yu Tsai
2021-01-06 16:08     ` André Przywara
2021-01-06 16:08       ` André Przywara
2021-01-13 14:02       ` Emmanuel Vadot
2021-01-13 14:02         ` Emmanuel Vadot
2021-01-06 16:01   ` Maxime Ripard
2021-01-06 16:01     ` Maxime Ripard
2021-01-06 15:05 ` [PATCH 3/7] arm64: dts: allwinner: Drop non-removable from SoPine/LTS SD card Andre Przywara
2021-01-06 15:05   ` Andre Przywara
2021-01-06 15:57   ` [linux-sunxi] " Chen-Yu Tsai
2021-01-06 15:57     ` Chen-Yu Tsai
2021-01-06 15:05 ` [PATCH 4/7] arm64: dts: allwinner: H6: Allow up to 150 MHz MMC bus frequency Andre Przywara
2021-01-06 15:05   ` Andre Przywara
2021-01-06 16:01   ` Chen-Yu Tsai [this message]
2021-01-06 16:01     ` [linux-sunxi] " Chen-Yu Tsai
2021-01-06 15:05 ` [PATCH 5/7] arm64: dts: allwinner: A64: Limit MMC2 bus frequency to 150 MHz Andre Przywara
2021-01-06 15:05   ` Andre Przywara
2021-01-06 15:58   ` [linux-sunxi] " Chen-Yu Tsai
2021-01-06 15:58     ` Chen-Yu Tsai
2021-01-06 15:05 ` [PATCH 6/7] arm64: dts: allwinner: Pine64-LTS/SoPine: Enable HS200 eMMC mode Andre Przywara
2021-01-06 15:05   ` Andre Przywara
2021-01-06 15:59   ` [linux-sunxi] " Chen-Yu Tsai
2021-01-06 15:59     ` Chen-Yu Tsai
2021-01-06 15:05 ` [PATCH 7/7] arm64: dts: allwinner: Pine H64: " Andre Przywara
2021-01-06 15:05   ` Andre Przywara
2021-01-06 16:00   ` [linux-sunxi] " Chen-Yu Tsai
2021-01-06 16:00     ` Chen-Yu Tsai

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