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authorWeifeng Voon <weifeng.voon@intel.com>2016-08-12 17:02:49 +0300
committerWolfram Sang <wsa@the-dreams.de>2016-08-26 00:42:05 +0200
commitd608c3d9ac818fc0addc884144c7550e03b0fc6f (patch)
treeb560469cebb07a4749afbed85c071a00c7203e7b /drivers/i2c
parenta92ec1746f10e339220bf186c4f6cce531b8a7ee (diff)
downloadblackbird-op-linux-d608c3d9ac818fc0addc884144c7550e03b0fc6f.tar.gz
blackbird-op-linux-d608c3d9ac818fc0addc884144c7550e03b0fc6f.zip
i2c: designware: Enable fast mode plus
This patch enabled fast mode plus. The fast mode plus and fast speed share the same HCNT and LCNT register. So, the fast mode plus will only run when the HCNT and LCNT value is provided. Else, it will run at fast speed as default. 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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-designware-core.c7
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c9
2 files changed, 11 insertions, 5 deletions
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index c6922b806fb7..07edff7a62e3 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -347,8 +347,11 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
dw_writel(dev, lcnt, DW_IC_SS_SCL_LCNT);
dev_dbg(dev->dev, "Standard-mode HCNT:LCNT = %d:%d\n", hcnt, lcnt);
- /* Set SCL timing parameters for fast-mode */
- if (dev->fs_hcnt && dev->fs_lcnt) {
+ /* Set SCL timing parameters for fast-mode or fast-mode plus */
+ if ((dev->clk_freq == 1000000) && dev->fp_hcnt && dev->fp_lcnt) {
+ hcnt = dev->fp_hcnt;
+ lcnt = dev->fp_lcnt;
+ } else if (dev->fs_hcnt && dev->fs_lcnt) {
hcnt = dev->fs_hcnt;
lcnt = dev->fs_lcnt;
} else {
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index cbe4fb31cb4b..ea92e9f3fba1 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -196,10 +196,13 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
dw_i2c_acpi_configure(pdev);
/*
- * Only standard mode at 100kHz and fast mode at 400kHz are supported.
+ * Only standard mode at 100kHz, fast mode at 400kHz,
+ * and fast mode plus at 1MHz are supported.
*/
- if (dev->clk_freq != 100000 && dev->clk_freq != 400000) {
- dev_err(&pdev->dev, "Only 100kHz and 400kHz supported");
+ if (dev->clk_freq != 100000 && dev->clk_freq != 400000
+ && dev->clk_freq != 1000000) {
+ dev_err(&pdev->dev,
+ "Only 100kHz, 400kHz and 1MHz are supported");
return -EINVAL;
}
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