i2c: designware: Enable high speed mode

This patch enabled high speed mode. High speed mode can be turn on by
setting the clk_freq to 3400000. High speed HCNT and LCNT are needed
as there is no default value provided.

Signed-off-by: Weifeng Voon <weifeng.voon@intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Weifeng Voon
2016-08-12 17:02:51 +03:00
committed by Wolfram Sang
parent 548e6695d1
commit b6e67145f1
3 changed files with 37 additions and 6 deletions

View File

@@ -197,12 +197,12 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
/*
* Only standard mode at 100kHz, fast mode at 400kHz,
* and fast mode plus at 1MHz are supported.
* fast mode plus at 1MHz and high speed mode at 3.4MHz are supported.
*/
if (dev->clk_freq != 100000 && dev->clk_freq != 400000
&& dev->clk_freq != 1000000) {
&& dev->clk_freq != 1000000 && dev->clk_freq != 3400000) {
dev_err(&pdev->dev,
"Only 100kHz, 400kHz and 1MHz are supported");
"Only 100kHz, 400kHz, 1MHz and 3.4MHz supported");
return -EINVAL;
}
@@ -221,10 +221,16 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
DW_IC_CON_RESTART_EN;
if (dev->clk_freq == 100000)
switch (dev->clk_freq) {
case 100000:
dev->master_cfg |= DW_IC_CON_SPEED_STD;
else
break;
case 3400000:
dev->master_cfg |= DW_IC_CON_SPEED_HIGH;
break;
default:
dev->master_cfg |= DW_IC_CON_SPEED_FAST;
}
dev->clk = devm_clk_get(&pdev->dev, NULL);
if (!i2c_dw_plat_prepare_clk(dev, true)) {