6.11-stable review patch. If anyone has any objections, please let me know.
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From: Liu Peibao loven.liu@jaguarmicro.com
commit 8de3e97f3d3d62cd9f3067f073e8ac93261597db upstream.
When the Tx FIFO is empty and the last command has no STOP bit set, the master holds SCL low. If I2C_DYNAMIC_TAR_UPDATE is not set, BIT(13) MST_ON_HOLD of IC_RAW_INTR_STAT is not enabled, causing the __i2c_dw_disable() timeout. This is quite similar to commit 2409205acd3c ("i2c: designware: fix __i2c_dw_disable() in case master is holding SCL low"). Also check BIT(7) MST_HOLD_TX_FIFO_EMPTY in IC_STATUS, which is available when IC_STAT_FOR_CLK_STRETCH is set.
Fixes: 2409205acd3c ("i2c: designware: fix __i2c_dw_disable() in case master is holding SCL low") Co-developed-by: Xiaowu Ding xiaowu.ding@jaguarmicro.com Signed-off-by: Xiaowu Ding xiaowu.ding@jaguarmicro.com Co-developed-by: Angus Chen angus.chen@jaguarmicro.com Signed-off-by: Angus Chen angus.chen@jaguarmicro.com Signed-off-by: Liu Peibao loven.liu@jaguarmicro.com Acked-by: Jarkko Nikula jarkko.nikula@linux.intel.com Signed-off-by: Andi Shyti andi.shyti@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/i2c/busses/i2c-designware-common.c | 6 ++++-- drivers/i2c/busses/i2c-designware-core.h | 1 + 2 files changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/i2c/busses/i2c-designware-common.c +++ b/drivers/i2c/busses/i2c-designware-common.c @@ -442,7 +442,7 @@ err_release_lock: void __i2c_dw_disable(struct dw_i2c_dev *dev) { struct i2c_timings *t = &dev->timings; - unsigned int raw_intr_stats; + unsigned int raw_intr_stats, ic_stats; unsigned int enable; int timeout = 100; bool abort_needed; @@ -450,9 +450,11 @@ void __i2c_dw_disable(struct dw_i2c_dev int ret;
regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &raw_intr_stats); + regmap_read(dev->map, DW_IC_STATUS, &ic_stats); regmap_read(dev->map, DW_IC_ENABLE, &enable);
- abort_needed = raw_intr_stats & DW_IC_INTR_MST_ON_HOLD; + abort_needed = (raw_intr_stats & DW_IC_INTR_MST_ON_HOLD) || + (ic_stats & DW_IC_STATUS_MASTER_HOLD_TX_FIFO_EMPTY); if (abort_needed) { if (!(enable & DW_IC_ENABLE_ENABLE)) { regmap_write(dev->map, DW_IC_ENABLE, DW_IC_ENABLE_ENABLE); --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h @@ -117,6 +117,7 @@ #define DW_IC_STATUS_RFNE BIT(3) #define DW_IC_STATUS_MASTER_ACTIVITY BIT(5) #define DW_IC_STATUS_SLAVE_ACTIVITY BIT(6) +#define DW_IC_STATUS_MASTER_HOLD_TX_FIFO_EMPTY BIT(7)
#define DW_IC_SDA_HOLD_RX_SHIFT 16 #define DW_IC_SDA_HOLD_RX_MASK GENMASK(23, 16)