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
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