diff options
| author | Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com> | 2020-04-07 16:34:38 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2020-04-15 14:13:33 +0300 |
| commit | 85f8fcaeed33315e19905af23f2693a81956688a (patch) | |
| tree | 6dbb77bf08604a751e7a8228e9ac316c745d1356 /drivers/i2c | |
| parent | 79d48da381ca977c60e17bdebd2e6f7c4c390df8 (diff) | |
| download | linux-85f8fcaeed33315e19905af23f2693a81956688a.tar.xz | |
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-master.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c index 3a58eef20936..23038d7272da 100644 --- a/drivers/i2c/busses/i2c-designware-master.c +++ b/drivers/i2c/busses/i2c-designware-master.c @@ -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 |