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[ Upstream commit4450f128c5] According to the specification, bit[2] represents SPRD_OUTBOX_FIFO_FULL, not bit[0], so correct it. Fixes:ca27fc26cd("mailbox: sprd: Add Spreadtrum mailbox driver") Signed-off-by: Magnum Shan <magnum.shan@unisoc.com> Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com> Reviewed-by: Baolin Wang <baolin.wang7@gmail.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>