UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

i3c: master: svc: fix invalidate IBI type and miss call client IBI handler 

commit 38baed9b8600008e5d7bc8cb9ceccc1af3dd54b7 upstream.

In an In-Band Interrupt (IBI) handle, the code logic is as follows:

1: writel(SVC_I3C_MCTRL_REQUEST_AUTO_IBI | SVC_I3C_MCTRL_IBIRESP_AUTO,
	  master->regs + SVC_I3C_MCTRL);

2: ret = readl_relaxed_poll_timeout(master->regs + SVC_I3C_MSTATUS, val,
                                    SVC_I3C_MSTATUS_IBIWON(val), 0, 1000);
	...
3: ibitype = SVC_I3C_MSTATUS_IBITYPE(status);
   ibiaddr = SVC_I3C_MSTATUS_IBIADDR(status);

SVC_I3C_MSTATUS_IBIWON may be set before step 1. Thus, step 2 will return
immediately, and the I3C controller has not sent out the 9th SCL yet.
Consequently, ibitype and ibiaddr are 0, resulting in an unknown IBI type
occurrence and missing call I3C client driver's IBI handler.

A typical case is that SVC_I3C_MSTATUS_IBIWON is set when an IBI occurs
during the controller send start frame in svc_i3c_master_xfer().

Clear SVC_I3C_MSTATUS_IBIWON before issue SVC_I3C_MCTRL_REQUEST_AUTO_IBI
to fix this issue.

Cc: stable@vger.kernel.org
Fixes: 5e5e3c92e748 ("i3c: master: svc: fix wrong data return when IBI happen during start frame")
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20240506164009.21375-3-Frank.Li@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frank Li 2024-05-06 12:40:09 -04:00 committed by Greg Kroah-Hartman
parent e049845096
commit aed55acbb9
1 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/i3c/master/svc-i3c-master.c
View File

@ -405,6 +405,19 @@ static void svc_i3c_master_ibi_work(struct work_struct *work)
int ret;
mutex_lock(&master->lock);
/*
* IBIWON may be set before SVC_I3C_MCTRL_REQUEST_AUTO_IBI, causing
* readl_relaxed_poll_timeout() to return immediately. Consequently,
* ibitype will be 0 since it was last updated only after the 8th SCL
* cycle, leading to missed client IBI handlers.
*
* A typical scenario is when IBIWON occurs and bus arbitration is lost
* at svc_i3c_master_priv_xfers().
*
* Clear SVC_I3C_MINT_IBIWON before sending SVC_I3C_MCTRL_REQUEST_AUTO_IBI.
*/
writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS);
/* Acknowledge the incoming interrupt with the AUTOIBI mechanism */
writel(SVC_I3C_MCTRL_REQUEST_AUTO_IBI |
SVC_I3C_MCTRL_IBIRESP_AUTO,
@ -419,9 +432,6 @@ static void svc_i3c_master_ibi_work(struct work_struct *work)
goto reenable_ibis;
}
/* Clear the interrupt status */
writel(SVC_I3C_MINT_IBIWON, master->regs + SVC_I3C_MSTATUS);
status = readl(master->regs + SVC_I3C_MSTATUS);
ibitype = SVC_I3C_MSTATUS_IBITYPE(status);
ibiaddr = SVC_I3C_MSTATUS_IBIADDR(status);