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049d919168
When disabling a counter from ddr_perf_event_stop(), the counter value is reset to 0 at the same time. Preserve the counter value by performing a read-modify-write of the PMU register and clearing only the enable bit. Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com> Signed-off-by: Will Deacon <will@kernel.org>