tree 5fdecb234d56f3f6e340ecd743bbdeb8b8a7f40b
parent 61ea482ba847c373e2dd7c5de9132d9ca47cf90a
author Marek Vasut <marex@denx.de> 1492538946 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1521885610 +0100

spi: dw: Disable clock after unregistering the host


[ Upstream commit 400c18e3dc86e04ef5afec9b86a8586ca629b9e9 ]

The dw_mmio driver disables the block clock before unregistering
the host. The code unregistering the host may access the SPI block
registers. If register access happens with block clock disabled,
this may lead to a bus hang. Disable the clock after unregistering
the host to prevent such situation.

This bug was observed on Altera Cyclone V SoC.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>