diff options
| -rw-r--r-- | drivers/spi/spi-mem.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c index 5db0639d3b01..c42c227eb2a2 100644 --- a/drivers/spi/spi-mem.c +++ b/drivers/spi/spi-mem.c @@ -591,9 +591,11 @@ EXPORT_SYMBOL_GPL(spi_mem_adjust_op_freq); u64 spi_mem_calc_op_duration(struct spi_mem_op *op) { u64 ncycles = 0; - u32 ns_per_cycles; + u64 ps_per_cycles, duration; + + ps_per_cycles = 1000000000000ULL; + do_div(ps_per_cycles, op->max_freq); - ns_per_cycles = 1000000000 / op->max_freq; ncycles += ((op->cmd.nbytes * 8) / op->cmd.buswidth) / (op->cmd.dtr ? 2 : 1); ncycles += ((op->addr.nbytes * 8) / op->addr.buswidth) / (op->addr.dtr ? 2 : 1); @@ -603,7 +605,12 @@ u64 spi_mem_calc_op_duration(struct spi_mem_op *op) ncycles += ((op->data.nbytes * 8) / op->data.buswidth) / (op->data.dtr ? 2 : 1); - return ncycles * ns_per_cycles; + /* Derive the duration in ps */ + duration = ncycles * ps_per_cycles; + /* Convert into ns */ + do_div(duration, 1000); + + return duration; } EXPORT_SYMBOL_GPL(spi_mem_calc_op_duration); |