linux-kernel - [PATCH 0/2] mmc: sdhci-pci-gli: GL9755: Quirks for Apple ARM platforms

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Date:   Tue,  7 Dec 2021 15:40:17 +0900
From:   Hector Martin <marcan@...can.st>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Marc Zyngier <maz@...nel.org>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 0/2] mmc: sdhci-pci-gli: GL9755: Quirks for Apple ARM platforms

Hi folks,

This short series adds a few quirks needed to make the card readers in
Apple M1 Pro/Max MacBook laptops work properly.

The first patch should be straightforward; it just allows configuring
the CD/WP polarity based on device tree settings. There is already a
standard DT binding for this.

The second patch bugs me. I don't understand why this problem happens
on these machines, and not on e.g. x86 laptops (which presumably work
with this driver). 8/16-bit MMIO reads work fine on other PCIe devices
on these machines, so it is not a generalized problem with the PCIe
controller in these SoCs. The problem also happens when running macOS
(it also uses 32-bit reads). Ben, is there any chance you might know
of some vendor-specific knob somewhere that can fix this issue without
requiring the MMIO read workaround? Interestingly, 8/16-bit writes
work perfectly fine.

Hector Martin (2):
  mmc: sdhci-pci-gli: GL9755: Support for CD/WP inversion on OF
    platforms
  mmc: sdhci-pci-gli: GL9755: Issue 8/16-bit MMIO reads as 32-bit reads.

 drivers/mmc/host/sdhci-pci-gli.c | 38 ++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

-- 
2.33.0