]> git.ipfire.org Git - thirdparty/kernel/stable.git/commit
i3c: don't fail if GETHDRCAP is unsupported
authorWolfram Sang <wsa+renesas@sang-engineering.com>
Fri, 4 Jul 2025 20:44:32 +0000 (22:44 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 28 Aug 2025 14:26:01 +0000 (16:26 +0200)
commit2b294135d3bb07d4881b0e7807da80f0c6b5cc00
treee144c4c4919b10a68d863ebd77737f615c5d4079
parent80d9ca544d729bd11aa5ef6ba3806b91546991c8
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>
drivers/i3c/master.c