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SSI BUSIF buffer is possible to overflow or underflow, especially in a hypervisor environment. If there is no interrupt support, it will eventually lead to errors in pcm data. This patch adds overflow and underflow interrupt support for SSI BUSIF buffer. Reported-by: Chen Li <licheng0822@thundersoft.com> Signed-off-by: Yongbo Zhang <giraffesnn123@gmail.com> Tested-by: Chen Li <licheng0822@thundersoft.com> Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Link: https://lore.kernel.org/r/20200512093003.28332-1-giraffesnn123@gmail.com Signed-off-by: Mark Brown <broonie@kernel.org>