linux-kernel - Re: [PATCH 0/6] RISC-V: Add eMMC support for TH1520 boards

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Date:   Fri, 22 Sep 2023 14:08:16 -0500
From:   Robert Nelson <robertcnelson@...il.com>
To:     Drew Fustini <dfustini@...libre.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jisheng Zhang <jszhang@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor@...nel.org>,
        Jason Kridner <jkridner@...gleboard.org>,
        Xi Ruoyao <xry111@...111.site>, Han Gao <gaohan@...as.ac.cn>,
        Icenowy Zheng <uwu@...nowy.me>, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 0/6] RISC-V: Add eMMC support for TH1520 boards

On Thu, Sep 21, 2023 at 8:51 PM Drew Fustini <dfustini@...libre.com> wrote:
>
> This series adds support for the eMMC on the BeagleV Ahead and the
> Sipeed LicheePi 4A. This allows the kernel to boot with the rootfs on
> eMMC.
>
> I tested on top of v6.6-rc2 with this config [1]. I was able to boot
> both the Ahead [2] and LPi4a [3] from eMMC. The following prerequisites
> are required:
>
>   [PATCH v2] riscv: dts: thead: set dma-noncoherent to soc bus [4]
>
> I pushed a branch [5] with this patch series and the above patch for
> those that find a git branch easier to test.
>
> Please note that only the MMC controller connected to the eMMC device
> is enabled in the device trees for these two boards. I did not yet
> attempt to configure and use the microSD card slot. My preference is to
> address that in a future patch series.
>
> References:
> [1] https://gist.github.com/pdp7/5fbdcf2a65eb1abdd3a29d519c19cdd2
> [2] https://gist.github.com/pdp7/91a801a5f8d1070c53509eda9800ad78
> [3] https://gist.github.com/pdp7/1445c3c991e88fd69c60165cef65726a
> [4] https://lore.kernel.org/linux-riscv/20230912072232.2455-1-jszhang@kernel.org/
> [5] https://github.com/pdp7/linux/tree/b4/th1520-mmc

This patchset came out very nice!

v6.6-rc2 with Last RFC v2:

[    4.066630] mmc0: SDHCI controller on ffe7080000.mmc
[ffe7080000.mmc] using PIO

debian@...gleV:~$ sudo hdparm -tT /dev/mmcblk0

/dev/mmcblk0:
 Timing cached reads:   1516 MB in  2.00 seconds = 758.09 MB/sec
 Timing buffered disk reads:  84 MB in  3.01 seconds =  27.94 MB/sec

vs v6.6-rc2 with this patchset:

 [    4.096837] mmc0: SDHCI controller on ffe7080000.mmc
[ffe7080000.mmc] using DMA

debian@...gleV:~$ sudo hdparm -tT /dev/mmcblk0

/dev/mmcblk0:
 Timing cached reads:   1580 MB in  2.00 seconds = 790.97 MB/sec
 Timing buffered disk reads: 418 MB in  3.00 seconds = 139.11 MB/sec

Regards,

-- 
Robert Nelson
https://rcn-ee.com/