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>
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committed by
Wolfram Sang

parent
548e6695d1
commit
b6e67145f1
@@ -197,12 +197,12 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
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/*
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* Only standard mode at 100kHz, fast mode at 400kHz,
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* and fast mode plus at 1MHz are supported.
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* fast mode plus at 1MHz and high speed mode at 3.4MHz are supported.
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*/
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if (dev->clk_freq != 100000 && dev->clk_freq != 400000
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&& dev->clk_freq != 1000000) {
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&& dev->clk_freq != 1000000 && dev->clk_freq != 3400000) {
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dev_err(&pdev->dev,
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"Only 100kHz, 400kHz and 1MHz are supported");
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"Only 100kHz, 400kHz, 1MHz and 3.4MHz supported");
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return -EINVAL;
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}
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@@ -221,10 +221,16 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
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dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
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DW_IC_CON_RESTART_EN;
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if (dev->clk_freq == 100000)
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switch (dev->clk_freq) {
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case 100000:
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dev->master_cfg |= DW_IC_CON_SPEED_STD;
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else
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break;
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case 3400000:
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dev->master_cfg |= DW_IC_CON_SPEED_HIGH;
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break;
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default:
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dev->master_cfg |= DW_IC_CON_SPEED_FAST;
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}
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dev->clk = devm_clk_get(&pdev->dev, NULL);
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if (!i2c_dw_plat_prepare_clk(dev, true)) {
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