Re: [PATCH] ARM: dts: add rk3288-firefly-reload

From: Shawn Lin <shawn.lin@rock-chips.com>
To: Heiko Stuebner <heiko@sntech.de>
Cc: shawn.lin@rock-chips.com, mark.rutland@arm.com,
	devicetree@vger.kernel.org, Randy Li <ayaka@soulik.info>,
	linux@armlinux.org.uk, linux-kernel@vger.kernel.org,
	linux-rockchip@lists.infradead.org, robh+dt@kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] ARM: dts: add rk3288-firefly-reload
Date: Mon, 8 Aug 2016 10:29:52 +0800	[thread overview]
Message-ID: <bd51b3c3-b312-babb-b57d-7e6e5a8ee948@rock-chips.com> (raw)
In-Reply-To: <1815189.oGy6GHMbyM@phil>

在 2016/8/7 22:44, Heiko Stuebner 写道:
> Hi Shawn,
>
> Am Sonntag, 7. August 2016, 11:40:21 schrieb Shawn Lin:
>> On 2016/7/19 3:46, Heiko Stübner wrote:
>>> Am Montag, 18. Juli 2016, 23:32:32 schrieb Randy Li:
>>>> The Firefly RK3288 Reload is a combination Firefly rk3288 core board
>>>> with the Reload baseboard. Add a dtsi for the Firefly rk3288 core
>>>> which can be included into the dts for the various baseboards
>>>> in the future and dts for Reload base board.
>>>>
>>>> Currently supported are serial console, wired networking, eMMC and
>>>> SD storage, SPFIF, IR receiver, LEDs, SDIO wifi and USB. But only
>>>> the OTG could work on the host mode now, the other USB host can't
>>>> work now, additional patches are required.
>>>>
>>>> Signed-off-by: Randy Li <ayaka@soulik.info>
>>>> Acked-by: Rob Herring <robh@kernel.org>
>>>
>>> applied [0], after some minor reordering - please double check.
>>>
>>> Also, while the branch is named 4.8 this will only go into 4.9, as the
>>> merge- window supposedly opens on the weekend.
>>
>> Sorry for the noise here:), but I find there is some mmc stuff
>> which confuse me. Maybe Randy could elaborate more?
>>
>> Your sdmmc claims to support UHS-I mode like sd-uhs-sdr104, etc, which
>> will ask dw_mmc to switch vqmmc from 3V3 to 1V8 after sending CMD11.
>>
>> But the vqmmc is vccio_sd which is fixed as 3V3? :)
>
> so far we have only been able to achieve UHS speeds on devices based on the
> rk808 pmic (I had sucess on veyron and popmetal). The act8846-based boards
> seem to have some issue when trying to do the switch to 1.8V, resulting in
> mmc errors and the mmc-core switching back to 3.3V.

Interesting.... I will have a look at it this weekend with Randy face 2
face....

>
> I think this might be caused by a bug in the act8846 driver or some dts
> mistake. But so far nobody had the time and enthusiasm to investigate :-)
>
>
> Heiko
>
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>

-- 
Best Regards
Shawn Lin