linux-kernel - [PATCH v2 0/2] mmc: sdhci-of-dwcmshc: Add CQE support

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Message-Id: <20230926090242.105020-1-serghox@gmail.com>
Date:   Tue, 26 Sep 2023 12:02:40 +0300
From:   Sergey Khimich <serghox@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mmc@...r.kernel.org, Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Jyan Chou <jyanchou@...ltek.com>
Subject: [PATCH v2 0/2] mmc: sdhci-of-dwcmshc: Add CQE support

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.

Thanks in advance, Sergey.

Sergey Khimich (2):
  mmc: cqhci: Add cqhci_set_tran_desc() callback
  Implement SDHCI CQE support for DesignWare SDHCI.

 drivers/mmc/host/Kconfig            |   1 +
 drivers/mmc/host/cqhci-core.c       |   5 +
 drivers/mmc/host/cqhci.h            |   3 +
 drivers/mmc/host/sdhci-of-dwcmshc.c | 233 +++++++++++++++++++++++++++-
 4 files changed, 240 insertions(+), 2 deletions(-)

-- 
2.30.2