From: Peng Fan <peng.fan@oss.nxp.com>
To: Eric Chung <eric.chung@riscstar.com>
Cc: u-boot-spacemit@groups.io, u-boot@lists.denx.de,
Tom Rini <trini@konsulko.com>, Peng Fan <peng.fan@nxp.com>,
Huan Zhou <pericycle.cc@gmail.com>,
Raymond Mao <raymond.mao@riscstar.com>,
Jaehoon Chung <jh80.chung@samsung.com>,
Bhimeswararao Matsa <bhimeswararao.matsa@gmail.com>,
Tanmay Kathpalia <tanmay.kathpalia@altera.com>,
Kaustabh Chakraborty <kauschluss@disroot.org>,
Han Xu <han.xu@nxp.com>, Yanir Levin <yanir.levin@tandemg.com>,
Christoph Stoidner <c.stoidner@phytec.de>,
Balsundar Ponnusamy <balsundar.ponnusamy@altera.com>,
Daniel Palmer <daniel@thingy.jp>, Anshul Dalal <anshuld@ti.com>,
Bastien Curutchet <bastien.curutchet@bootlin.com>,
Angelo Dureghello <angelo@kernel-space.org>,
Johan Jonker <jbx6244@gmail.com>, Rick Chen <rick@andestech.com>,
Leo <ycliang@andestech.com>,
Sam Protsenko <semen.protsenko@linaro.org>,
Guodong Xu <guodong.xu@riscstar.com>
Subject: Re: [PATCH v2 v2 2/8] mmc: sdhci: add quirk to enable CMD23 for multi-block transfers
Date: Tue, 30 Jun 2026 10:47:44 +0800 [thread overview]
Message-ID: <akMuUIkPhIK33vZa@shlinux89> (raw)
In-Reply-To: <20260629-m4-v2-2-cbc91c6b83d8@riscstar.com>
On Mon, Jun 29, 2026 at 11:51:16PM +0800, Eric Chung wrote:
>Introduce a controller-specific quirk to select CMD23 (SET_BLOCK_COUNT)
>for read/write multi-block operations instead of the legacy CMD18/CMD25
>with open-ended or pre-defined block counts.
>
>This allows SDHCI host controllers that support CMD23 to improve I/O
>efficiency by reducing the number of CMD12 (STOP_TRANSMISSION) commands
>for multi-block transfers.
This is a misuse of the quirk mechanism.
CMD23 (SET_BLOCK_COUNT) is part of the SD/eMMC specification -
it's the standard defined-length multi-block transfer method.
Quirks exist for hardware that deviates from spec, not for enabling
spec-compliant behavior.
Regards
Peng
next prev parent reply other threads:[~2026-06-30 2:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-29 15:51 [PATCH v2 0/8] spacemit mmc driver Eric Chung
2026-06-29 15:51 ` [PATCH v2 v2 1/8] pinctrl: k1: add IO power domain configuration support Eric Chung
2026-06-30 8:55 ` Yao Zi
2026-06-29 15:51 ` [PATCH v2 v2 2/8] mmc: sdhci: add quirk to enable CMD23 for multi-block transfers Eric Chung
2026-06-30 2:47 ` Peng Fan [this message]
2026-06-29 15:51 ` [PATCH v2 v2 3/8] mmc: k1: add sdhci platform driver Eric Chung
2026-06-30 2:52 ` Peng Fan
2026-06-29 15:51 ` [PATCH v2 v2 4/8] dts: k1: add SD card support in u-boot overlay Eric Chung
2026-06-30 2:56 ` Peng Fan
2026-06-29 15:51 ` [PATCH v2 v2 5/8] configs: k1: enable SD and eMMC support Eric Chung
2026-06-29 15:51 ` [PATCH v2 v2 6/8] doc: spacemit: flash on K1 SoC based boards Eric Chung
2026-06-29 15:51 ` [PATCH v2 v2 7/8] config: k1: enable ENV support for eMMC Eric Chung
2026-06-29 15:51 ` [PATCH v2 v2 8/8] spacemit: k1: load product name from environment variable Eric Chung
2026-06-30 2:55 ` Peng Fan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=akMuUIkPhIK33vZa@shlinux89 \
--to=peng.fan@oss.nxp.com \
--cc=angelo@kernel-space.org \
--cc=anshuld@ti.com \
--cc=balsundar.ponnusamy@altera.com \
--cc=bastien.curutchet@bootlin.com \
--cc=bhimeswararao.matsa@gmail.com \
--cc=c.stoidner@phytec.de \
--cc=daniel@thingy.jp \
--cc=eric.chung@riscstar.com \
--cc=guodong.xu@riscstar.com \
--cc=han.xu@nxp.com \
--cc=jbx6244@gmail.com \
--cc=jh80.chung@samsung.com \
--cc=kauschluss@disroot.org \
--cc=peng.fan@nxp.com \
--cc=pericycle.cc@gmail.com \
--cc=raymond.mao@riscstar.com \
--cc=rick@andestech.com \
--cc=semen.protsenko@linaro.org \
--cc=tanmay.kathpalia@altera.com \
--cc=trini@konsulko.com \
--cc=u-boot-spacemit@groups.io \
--cc=u-boot@lists.denx.de \
--cc=yanir.levin@tandemg.com \
--cc=ycliang@andestech.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.