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This patch delete the mutex in dw_hdmi_suspend. For there is no need to use mutex to protect disable_irq. And the same mutex is also used in the dw_hdmi_irq, mutex deadlock will occur when dw_hdmi_suspend and dw_hdmi_irq are called at the same time. Change-Id: I8cb6a6483aa4d32882e814656dd93317b5da9ad3 Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>