linux-kernel - [PATCH 5.10 153/188] i2c: designware: Adjust bus_freq

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Message-Id: <20210412084018.709994647@linuxfoundation.org>
Date:   Mon, 12 Apr 2021 10:41:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 153/188] i2c: designware: Adjust bus_freq_hz when refuse high speed mode set

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

[ Upstream commit 5e729bc54bda705f64941008b018b4e41a4322bf ]

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>
Reviewed-by: Barry Song <song.bao.hua@...ilicon.com>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 d6425ad6e6a3..2871cf2ee8b4 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