linux-kernel - Re: [PATCH v7 0/2] mmc: sdhci-of-dwcmshc: Add CQE support

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Message-ID: <CAPDyKFokNLX8zAr=Cai58UZivt_c63aQXjaLyuPKnzAmQcQhzg@mail.gmail.com>
Date: Mon, 25 Mar 2024 14:19:10 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Sergey Khimich <serghox@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org, 
	Adrian Hunter <adrian.hunter@...el.com>, Shawn Lin <shawn.lin@...k-chips.com>, 
	Jyan Chou <jyanchou@...ltek.com>, Asutosh Das <quic_asutoshd@...cinc.com>, 
	Ritesh Harjani <ritesh.list@...il.com>
Subject: Re: [PATCH v7 0/2] mmc: sdhci-of-dwcmshc: Add CQE support

On Tue, 19 Mar 2024 at 12:59, Sergey Khimich <serghox@...il.com> wrote:
>
> Hello!
>
> This is implementation of SDHCI CQE support for sdhci-of-dwcmshc driver.
> For enabling CQE support just set 'supports-cqe' in your DevTree file
> for appropriate mmc node.
>
> Also, while implementing CQE support for the driver, I faced with a problem
> which I will describe below.
> According to the IP block documentation CQE works only with "AMDA-2 only"
> mode which is activated only with v4 mode enabled. I see in dwcmshc_probe()
> function that v4 mode gets enabled only for 'sdhci_dwcmshc_bf3_pdata'
> platform data.
>
> So my question is: is it correct to enable v4 mode for all platform data
> if 'SDHCI_CAN_64BIT_V4' bit is set in hw?
>
> Because I`m afraid that enabling v4 mode for some platforms could break
> them down. On the other hand, if host controller says that it can do v4
> (caps & SDHCI_CAN_64BIT_V4), lets do v4 or disable it manualy by some
> quirk. Anyway - RFC.
>
>
> v2:
>  - Added dwcmshc specific cqe_disable hook to prevent losing
>    in-flight cmd when an ioctl is issued and cqe_disable is called;
>
>  - Added processing 128Mb boundary for the host memory data buffer size
>    and the data buffer. For implementing this processing an extra
>    callback is added to the struct 'sdhci_ops'.
>
>  - Fixed typo.
>
> v3:
>  - Fix warning reported by kernel test robot:
>         | Reported-by: kernel test robot <lkp@...el.com>
>         | Closes: https://lore.kernel.org/oe-kbuild-all/202309270807.VoVn81m6-lkp@intel.com/
>         | Closes: https://lore.kernel.org/oe-kbuild-all/202309300806.dcR19kcE-lkp@intel.com/
>
> v4:
>  - Data reset moved to custom driver tuning hook.
>  - Removed unnecessary dwcmshc_sdhci_cqe_disable() func
>  - Removed unnecessary dwcmshc_cqhci_set_tran_desc. Export and use
>    cqhci_set_tran_desc() instead.
>  - Provide a hook for cqhci_set_tran_desc() instead of cqhci_prep_tran_desc().
>  - Fix typo: int_clok_disable --> int_clock_disable
>
> v5:
>  - Fix warning reported by kernel test robot:
>         | Reported-by: kernel test robot <lkp@...el.com>
>         | Closes: https://lore.kernel.org/oe-kbuild-all/202312301130.itEZhhI5-lkp@intel.com/
>
> v6:
>  - Rebase to master branch
>  - Fix typo;
>  - Fix double blank line;
>  - Add cqhci_suspend() and cqhci_resume() functions
>    to support mmc suspend-to-ram (s2r);
>  - Move reading DWCMSHC_P_VENDOR_AREA2 register under "supports-cqe"
>    condition as not all IPs have that register;
>  - Remove sdhci V4 mode from the list of prerequisites to init cqhci.
>
> v7:
>  - Add disabling MMC_CAP2_CQE and MMC_CAP2_CQE_DCMD caps
>    in case of CQE init fails to prevent problems in suspend/resume
>    functions.
>
> Sergey Khimich (2):
>   mmc: cqhci: Add cqhci set_tran_desc() callback
>   mmc: sdhci-of-dwcmshc: Implement SDHCI CQE support
>
>  drivers/mmc/host/Kconfig            |   1 +
>  drivers/mmc/host/cqhci-core.c       |  11 +-
>  drivers/mmc/host/cqhci.h            |   4 +
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 191 +++++++++++++++++++++++++++-
>  4 files changed, 202 insertions(+), 5 deletions(-)
>

Applied for next and by fixing a minor conflict when applying, thanks!

Kind regards
Uffe