i3c: don't fail if GETHDRCAP is unsupported

[ Upstream commit 447270cdb41b1c8c3621bb14b93a6749f942556e ]

'I3C_BCR_HDR_CAP' is still spec v1.0 and has been renamed to 'advanced
capabilities' in v1.1 onwards. The ST pressure sensor LPS22DF does not
have HDR, but has the 'advanced cap' bit set. The core still wants to
get additional information using the CCC 'GETHDRCAP' (or GETCAPS in v1.1
onwards). Not all controllers support this CCC and will notify the upper
layers about it. For instantiating the device, we can ignore this
unsupported CCC as standard communication will work. Without this patch,
the device will not be instantiated at all.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250704204524.6124-1-wsa+renesas@sang-engineering.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 6d56d23d642988909d4221e771eaf27deeed9662..203b7497b52dce9672a517a33cd4f4fd4a487f78 100644 (file)
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1308,7 +1308,7 @@ static int i3c_master_retrieve_dev_info(struct i3c_dev_desc *dev)
 
        if (dev->info.bcr & I3C_BCR_HDR_CAP) {
                ret = i3c_master_gethdrcap_locked(master, &dev->info);
-               if (ret)
+               if (ret && ret != -ENOTSUPP)
                        return ret;
        }