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soc: aspeed: snoop: Add clock control logic
[ Upstream commit 3f94cf1 ] If LPC SNOOP driver is registered ahead of lpc-ctrl module, LPC SNOOP block will be enabled without heart beating of LCLK until lpc-ctrl enables the LCLK. This issue causes improper handling on host interrupts when the host sends interrupt in that time frame. Then kernel eventually forcibly disables the interrupt with dumping stack and printing a 'nobody cared this irq' message out. To prevent this issue, all LPC sub-nodes should enable LCLK individually so this patch adds clock control logic into the LPC SNOOP driver. Fixes: 3772e5d ("drivers/misc: Aspeed LPC snoop output using misc chardev") Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com> Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com> Signed-off-by: John Wang <wangzhiqiang.bj@bytedance.com> Reviewed-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20201208091748.1920-1-wangzhiqiang.bj@bytedance.com Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Sasha Levin <sashal@kernel.org>
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