Commit 85f8fcae authored by Wan Ahmad Zainie's avatar Wan Ahmad Zainie Committed by Wolfram Sang
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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: default avatarWan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 79d48da3

drivers/i2c/busses/i2c-designware-master.c

+16 −3
Original line number Diff line number Diff line
@@ -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