From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Serge Semin <Sergey.Semin@baikalelectronics.ru>,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Jarkko Nikula <jarkko.nikula@linux.intel.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
wsa@kernel.org, Yicong Yang <yangyicong@hisilicon.com>,
"Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>
Subject: [PATCH v1 1/1] i2c: designware: Adjust bus_freq_hz when refuse high speed mode set
Date: Wed, 31 Mar 2021 14:05:10 +0300 [thread overview]
Message-ID: <20210331110510.67523-1-andriy.shevchenko@linux.intel.com> (raw)
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@hisilicon.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.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
next reply other threads:[~2021-03-31 11:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-31 11:05 Andy Shevchenko [this message]
2021-03-31 21:37 ` [PATCH v1 1/1] i2c: designware: Adjust bus_freq_hz when refuse high speed mode set Song Bao Hua (Barry Song)
2021-04-05 11:55 ` Andy Shevchenko
2021-04-05 20:50 ` Wolfram Sang
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