linux-kernel - [PATCH] i3c: master: Fix SETDASA process

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Date:   Tue, 22 Aug 2023 05:19:38 +0000
From:   Aniket <aniketmaurya@...gle.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
        joychakr@...gle.com, manugautam@...gle.com,
        Aniket <aniketmaurya@...gle.com>
Subject: [PATCH] i3c: master: Fix SETDASA process

When a I3C DT node has a static_addr and an init_dyn_addr,the
init_dyn_addr is reserved in i3c_master_bus_init() and then
the static_addr is reserved in i3c_master_early_i3c_dev_add().
But if the dynamic address is same as static then above
procedure would fail.
Add a check to pass i3c_bus_get_addr_slot_status() when static
and dynamic address are equal.

Signed-off-by: Aniket <aniketmaurya@...gle.com>
---
 drivers/i3c/master.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 08aeb69a7800..87283e4a4607 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1308,7 +1308,11 @@ static int i3c_master_get_i3c_addrs(struct i3c_dev_desc *dev)
 	if (dev->info.static_addr) {
 		status = i3c_bus_get_addr_slot_status(&master->bus,
 						      dev->info.static_addr);
-		if (status != I3C_ADDR_SLOT_FREE)
+		/* Since static address and assigned dynamic address can be
+		 * equal, allow this case to pass.
+		 */
+		if (status != I3C_ADDR_SLOT_FREE &&
+		    dev->info.static_addr != dev->boardinfo->init_dyn_addr)
 			return -EBUSY;
 
 		i3c_bus_set_addr_slot_status(&master->bus,
-- 
2.42.0.rc1.204.g551eb34607-goog