From: Stanley Chu <yschu@xxxxxxxxxxx> When MCONFIG.SKEW=0 and MCONFIG.ODHPP=0, the ENTDAA transaction gets corrupted and results in a no repeated-start condition at the end of address assignment. Workaround: Set MCONFIG.SKEW to 1 before initiating the DAA process. After the DAA process is completed, return MCONFIG.SKEW to its previous value. Reviewed-by: Frank Li <Frank.Li@xxxxxxx> Signed-off-by: Stanley Chu <yschu@xxxxxxxxxxx> --- drivers/i3c/master/svc-i3c-master.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index 952afc75f6e4..774f94ee761c 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -1169,7 +1169,16 @@ static int svc_i3c_master_do_daa(struct i3c_master_controller *m) } spin_lock_irqsave(&master->xferqueue.lock, flags); + + if (svc_has_daa_corrupt(master)) + writel(master->mctrl_config | SVC_I3C_MCONFIG_SKEW(1), + master->regs + SVC_I3C_MCONFIG); + ret = svc_i3c_master_do_daa_locked(master, addrs, &dev_nb); + + if (svc_has_daa_corrupt(master)) + writel(master->mctrl_config, master->regs + SVC_I3C_MCONFIG); + spin_unlock_irqrestore(&master->xferqueue.lock, flags); svc_i3c_master_clear_merrwarn(master); -- 2.34.1
