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| author | Zhang Lixu <lixu.zhang@intel.com> | 2025-12-12 05:51:50 +0300 |
|---|---|---|
| committer | Benjamin Tissoires <bentiss@kernel.org> | 2025-12-19 14:11:56 +0300 |
| commit | 56e230723e3a818373bd62331bccb1c6d2b3881b (patch) | |
| tree | 7751182373decb49c3e68556c1347c203a246619 /drivers/hid | |
| parent | daeed86b686855adda79f13729e0c9b0530990be (diff) | |
| download | linux-56e230723e3a818373bd62331bccb1c6d2b3881b.tar.xz | |
HID: intel-ish-hid: Reset enum_devices_done before enumeration
Some systems have enabled ISH without any sensors. In this case sending
HOSTIF_DM_ENUM_DEVICES results in 0 sensors. This triggers ISH hardware
reset on subsequent enumeration after S3/S4 resume.
The enum_devices_done flag was not reset before sending the
HOSTIF_DM_ENUM_DEVICES command. On subsequent enumeration calls (such as
after S3/S4 resume), this flag retains its previous true value, causing the
wait loop to be skipped and returning prematurely to hid_ishtp_cl_init().
If 0 HID devices are found, hid_ishtp_cl_init() skips getting HID device
descriptors and sets init_done to true. When the delayed enumeration
response arrives with init_done already true, the driver treats it as a bad
packet and triggers an ISH hardware reset.
Set enum_devices_done to false before sending the enumeration command,
consistent with similar functions like ishtp_get_hid_descriptor() and
ishtp_get_report_descriptor() which reset their respective flags.
Signed-off-by: Zhang Lixu <lixu.zhang@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/intel-ish-hid/ishtp-hid-client.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/hid/intel-ish-hid/ishtp-hid-client.c b/drivers/hid/intel-ish-hid/ishtp-hid-client.c index f37b3bc2bb7d..6d64008f2ce0 100644 --- a/drivers/hid/intel-ish-hid/ishtp-hid-client.c +++ b/drivers/hid/intel-ish-hid/ishtp-hid-client.c @@ -495,6 +495,7 @@ static int ishtp_enum_enum_devices(struct ishtp_cl *hid_ishtp_cl) int rv; /* Send HOSTIF_DM_ENUM_DEVICES */ + client_data->enum_devices_done = false; memset(&msg, 0, sizeof(struct hostif_msg)); msg.hdr.command = HOSTIF_DM_ENUM_DEVICES; rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *)&msg, |