提交 d7cf4ccf 编写于 作者: D Dean Luick 提交者: Doug Ledford

IB/hfi1: Fix dc8051 multiple qword memory reads

When reading multiple dc8051 data memory locations
at once, the read enabled field must be toggled
at every address change.  Do that by writing only
the address first, then writing the enable.
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Reviewed-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>
上级 62aeddbf
......@@ -263,11 +263,13 @@ static int __read_8051_data(struct hfi1_devdata *dd, u32 addr, u64 *result)
u64 reg;
int count;
/* start the read at the given address */
reg = ((addr & DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_MASK)
<< DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_SHIFT)
| DC_DC8051_CFG_RAM_ACCESS_CTRL_READ_ENA_SMASK;
/* step 1: set the address, clear enable */
reg = (addr & DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_MASK)
<< DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_SHIFT;
write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_CTRL, reg);
/* step 2: enable */
write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_CTRL,
reg | DC_DC8051_CFG_RAM_ACCESS_CTRL_READ_ENA_SMASK);
/* wait until ACCESS_COMPLETED is set */
count = 0;
......
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