]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
spi: bcm2835aux: ensure interrupts are enabled for shared handler
authorRob Herring <robh@kernel.org>
Thu, 3 May 2018 18:09:44 +0000 (13:09 -0500)
committerMark Brown <broonie@kernel.org>
Thu, 3 May 2018 23:09:02 +0000 (08:09 +0900)
commitbc519d9574618e47a0c788000fb78da95e18d953
treec1405de627823cde094254b4a65817d73c14a06a
parent602805fb618b018b7a41fbb3f93c1992b078b1ae
spi: bcm2835aux: ensure interrupts are enabled for shared handler

The BCM2835 AUX SPI has a shared interrupt line (with AUX UART).
Downstream fixes this with an AUX irqchip to demux the IRQ sources and a
DT change which breaks compatibility with older kernels. The AUX irqchip
was already rejected for upstream[1] and the DT change would break
working systems if the DTB is updated to a newer one. The latter issue
was brought to my attention by Alex Graf.

The root cause however is a bug in the shared handler. Shared handlers
must check that interrupts are actually enabled before servicing the
interrupt. Add a check that the TXEMPTY or IDLE interrupts are enabled.

[1] https://patchwork.kernel.org/patch/9781221/

Cc: Alexander Graf <agraf@suse.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Eric Anholt <eric@anholt.net>
Cc: Stefan Wahren <stefan.wahren@i2se.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: bcm-kernel-feedback-list@broadcom.com
Cc: linux-spi@vger.kernel.org
Cc: linux-rpi-kernel@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/spi/spi-bcm2835aux.c