linux-kernel - RE: [PATCH v1 1/1] i2c: designware: Adjust bus_freq

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Message-ID: <07b6264280314d919f2747290bb80b01@hisilicon.com>
Date:   Wed, 31 Mar 2021 21:37:41 +0000
From:   "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "wsa@...nel.org" <wsa@...nel.org>,
        yangyicong <yangyicong@...wei.com>
Subject: RE: [PATCH v1 1/1] i2c: designware: Adjust bus_freq_hz when refuse
 high speed mode set



> -----Original Message-----
> From: Andy Shevchenko [mailto:andriy.shevchenko@...ux.intel.com]
> Sent: Thursday, April 1, 2021 12:05 AM
> To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>; Serge Semin
> <Sergey.Semin@...kalelectronics.ru>; linux-i2c@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Cc: Jarkko Nikula <jarkko.nikula@...ux.intel.com>; Mika Westerberg
> <mika.westerberg@...ux.intel.com>; wsa@...nel.org; yangyicong
> <yangyicong@...wei.com>; Song Bao Hua (Barry Song) <song.bao.hua@...ilicon.com>
> Subject: [PATCH v1 1/1] i2c: designware: Adjust bus_freq_hz when refuse high
> speed mode set
> 
> When hardware doesn't support High Speed Mode, we forget bus_freq_hz
> timing adjustment. This makes the timings and real registers being
> unsynchronized. Adjust bus_freq_hz when refuse high speed mode set.
> 
> Fixes: b6e67145f149 ("i2c: designware: Enable high speed mode")
> Reported-by: "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---

Thanks for fixing that.

Reviewed-by: Barry Song <song.bao.hua@...ilicon.com>

>  drivers/i2c/busses/i2c-designware-master.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/i2c/busses/i2c-designware-master.c
> b/drivers/i2c/busses/i2c-designware-master.c
> index 34bb4e21bcc3..9bfa06e31eec 100644
> --- a/drivers/i2c/busses/i2c-designware-master.c
> +++ b/drivers/i2c/busses/i2c-designware-master.c
> @@ -129,6 +129,7 @@ static int i2c_dw_set_timings_master(struct dw_i2c_dev
> *dev)
>  		if ((comp_param1 & DW_IC_COMP_PARAM_1_SPEED_MODE_MASK)
>  			!= DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH) {
>  			dev_err(dev->dev, "High Speed not supported!\n");
> +			t->bus_freq_hz = I2C_MAX_FAST_MODE_FREQ;
>  			dev->master_cfg &= ~DW_IC_CON_SPEED_MASK;
>  			dev->master_cfg |= DW_IC_CON_SPEED_FAST;
>  			dev->hs_hcnt = 0;
> --
> 2.30.2