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 fd81871609d95bc082bd401681e7e132ea74f8a7..e53c69d248730042e177b8e316efce0657e26a29 100644 (file)
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1439,7 +1439,7 @@ 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;
        }