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

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Message-Id: <20210331110510.67523-1-andriy.shevchenko@linux.intel.com>
Date:   Wed, 31 Mar 2021 14:05:10 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
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, Yicong Yang <yangyicong@...ilicon.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>
---
 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