diff mbox series

[v2,3/7] i2c: npcm: use a software flag to indicate a BER condition

Message ID 20240830034640.7049-4-kfting@nuvoton.com
State New
Headers show
Series i2c: npcm: Bug fixes read/write operation, checkpatch | expand

Commit Message

Tyrone Ting Aug. 30, 2024, 3:46 a.m. UTC 
If not clearing the BB (bus busy) condition in the BER (bus error)
interrupt, the driver causes a timeout and hence the i2c core
doesn't do the i2c transfer retry but returns the driver's return
value to the upper layer instead.

Clear the BB condition in the BER interrupt and a software flag is
used. The driver does an i2c recovery without causing the timeout
if the flag is set.

Fixes: 48acf8292280 ("i2c: Remove redundant comparison in npcm_i2c_reg_slave")
Signed-off-by: Tyrone Ting <kfting@nuvoton.com>
---
 drivers/i2c/busses/i2c-npcm7xx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Comments

Andi Shyti Sept. 5, 2024, 9:33 p.m. UTC | #1 
Hi,

On Fri, Aug 30, 2024 at 11:46:36AM GMT, Tyrone Ting wrote:
> If not clearing the BB (bus busy) condition in the BER (bus error)
> interrupt, the driver causes a timeout and hence the i2c core
> doesn't do the i2c transfer retry but returns the driver's return
> value to the upper layer instead.
> 
> Clear the BB condition in the BER interrupt and a software flag is
> used. The driver does an i2c recovery without causing the timeout
> if the flag is set.
> 
> Fixes: 48acf8292280 ("i2c: Remove redundant comparison in npcm_i2c_reg_slave")
> Signed-off-by: Tyrone Ting <kfting@nuvoton.com>

Can I have an ack from the supporters of the ARM/NUVOTON NPCM
ARCHITECTURE here?

Thanks,
Andi
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c
index 2b76dbfba438..2d034503d8bc 100644
--- a/drivers/i2c/busses/i2c-npcm7xx.c
+++ b/drivers/i2c/busses/i2c-npcm7xx.c
@@ -334,6 +334,7 @@  struct npcm_i2c {
 	u64 nack_cnt;
 	u64 timeout_cnt;
 	u64 tx_complete_cnt;
+	bool ber_state;
 };
 
 static inline void npcm_i2c_select_bank(struct npcm_i2c *bus,
@@ -1521,6 +1522,7 @@  static void npcm_i2c_irq_handle_ber(struct npcm_i2c *bus)
 	if (npcm_i2c_is_master(bus)) {
 		npcm_i2c_master_abort(bus);
 	} else {
+		bus->ber_state = true;
 		npcm_i2c_clear_master_status(bus);
 
 		/* Clear BB (BUS BUSY) bit */
@@ -1699,6 +1701,7 @@  static int npcm_i2c_recovery_tgclk(struct i2c_adapter *_adap)
 		dev_dbg(bus->dev, "bus%d-0x%x recovery skipped, bus not stuck",
 			bus->num, bus->dest_addr);
 		npcm_i2c_reset(bus);
+		bus->ber_state = false;
 		return 0;
 	}
 
@@ -1763,6 +1766,7 @@  static int npcm_i2c_recovery_tgclk(struct i2c_adapter *_adap)
 		if (bus->rec_succ_cnt < ULLONG_MAX)
 			bus->rec_succ_cnt++;
 	}
+	bus->ber_state = false;
 	return status;
 }
 
@@ -2158,7 +2162,7 @@  static int npcm_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 
 	} while (time_is_after_jiffies(time_left) && bus_busy);
 
-	if (bus_busy) {
+	if (bus_busy || bus->ber_state) {
 		iowrite8(NPCM_I2CCST_BB, bus->reg + NPCM_I2CCST);
 		npcm_i2c_reset(bus);
 		i2c_recover_bus(adap);