A_PL_INT_CAUSE0
u32 cause = t3_read_reg(adapter, A_PL_INT_CAUSE0);
t3_write_reg(adapter, A_PL_INT_CAUSE0, cause);
(void) t3_read_reg(adapter, A_PL_INT_CAUSE0); /* flush */
t3_write_reg(adapter, A_PL_INT_CAUSE0, 0xffffffff);
(void) t3_read_reg(adapter, A_PL_INT_CAUSE0); /* flush */