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Message-ID: <ccd8be6a-c8d4-407b-906a-e4788a365775@kwiboo.se>
Date: Thu, 6 Mar 2025 10:16:00 +0100
From: Jonas Karlman <jonas@...boo.se>
To: Chukun Pan <amadeus@....edu.cn>
Cc: conor+dt@...nel.org, devicetree@...r.kernel.org, heiko@...ech.de,
 krzk+dt@...nel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
 linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 0/3] rockchip: Add support for onboard eMMC on Radxa E20C

Hi Chukun,

On 2025-03-06 10:00, Chukun Pan wrote:
> Hi,
> 
>> Driver changes to use different delay and tap num is needed to be able
>> to support HS400 modes, something for a future series. With this HS200
>> mode should work:
> 
> I have tried HS200 mode on other rk3528 boards and it works fine,
> so can we enable HS200 mode for Radxa E20C first?

The host controller already report the HS200 mode, and as shown in cover
letter HS200 mode is being enabled/used with this series.

However, the driver must use different tap/delay num for HS400(ES) modes.
At top of [1] there is a commit that changes to use same tap/delay num
as vendor kernel and what I have tested worked in U-Boot. That commit
needs to be re-worked before it is ready. Also see [2] for pending work
before I plan to complete before moving on to the dwcmshc driver.

[1] https://github.com/Kwiboo/linux-rockchip/commits/next-20250227-rk3528-rk3506/
[2] https://github.com/Kwiboo/linux-rockchip/commits/next-20250305-rk3528/

Regards,
Jonas

> 
> Thanks,
> Chukun
> 


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