This is a note to let you know that I've just added the patch titled i2c: designware: Adjust bus_freq_hz when refuse high speed mode set to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: i2c-designware-adjust-bus_freq_hz-when-refuse-high-s.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit a4766970073004ce215c0bd484c18a4483717c5f Author: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Date: Wed Mar 31 14:05:10 2021 +0300 i2c: designware: Adjust bus_freq_hz when refuse high speed mode set [ 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@xxxxxxxxxxxxx> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Reviewed-by: Barry Song <song.bao.hua@xxxxxxxxxxxxx> Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> 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;