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i2c: designware: Calculate SCL timing parameter for Fast Mode Plus 

Custom parameters for HCNT/LCNT are not available for OF based system.
Thus, we will use existing SCL timing parameter calculation functions
for Fast Mode Plus.

Signed-off-by: Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wan Ahmad Zainie 2020-04-07 21:34:38 +08:00 committed by Wolfram Sang
parent 79d48da381
commit 85f8fcaeed
1 changed files with 16 additions and 3 deletions
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19
drivers/i2c/busses/i2c-designware-master.c
View File

@ -76,14 +76,27 @@ static int i2c_dw_set_timings_master(struct dw_i2c_dev *dev)
*/
if (t->bus_freq_hz == 1000000) {
/*
* Check are fast mode plus parameters available and use
* fast mode if not.
* Check are Fast Mode Plus parameters available. Calculate
* SCL timing parameters for Fast Mode Plus if not set.
*/
if (dev->fp_hcnt && dev->fp_lcnt) {
dev->fs_hcnt = dev->fp_hcnt;
dev->fs_lcnt = dev->fp_lcnt;
fp_str = " Plus";
} else {
ic_clk = i2c_dw_clk_rate(dev);
dev->fs_hcnt =
i2c_dw_scl_hcnt(ic_clk,
260, /* tHIGH = 260 ns */
sda_falling_time,
0, /* DW default */
0); /* No offset */
dev->fs_lcnt =
i2c_dw_scl_lcnt(ic_clk,
500, /* tLOW = 500 ns */
scl_falling_time,
0); /* No offset */
}
fp_str = " Plus";
}
/*
* Calculate SCL timing parameters for fast mode if not set. They are