diff options
| author | Johan Hovold <johan+linaro@kernel.org> | 2025-04-30 15:51:46 +0200 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2025-05-06 11:12:30 +0100 |
| commit | 397f802d06c418efa636e46083edbeb00c91369e (patch) | |
| tree | c881437be9f2e7ab28fa1a3dd6b3c93782567c69 /drivers/firmware/arm_scmi/driver.c | |
| parent | 7b487beab7cd853ab7de58746284898fb9316334 (diff) | |
firmware: arm_scmi: quirk: Force perf level get fastchannel
The Qualcomm SCP firmware in X1E machines like the Lenovo ThinkPad T14s
does not set the FastChannel supported attribute bit for PERF_LEVEL_GET
but crashes when falling back to regular messaging.
Use the new SCMI quirk framework to force FastChannel initialisation for
this implementation.
Note that we can add an upper bound on the version matching when we
learn which version has a fix (or limit matching using a SoC compatible
string in the unlikely event that always enabling FC causes trouble
somewhere).
Link: https://lore.kernel.org/lkml/Z4Dt8E7C6upVtEGV@hovoldconsulting.com/
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Message-Id: <20250430135146.5154-1-johan+linaro@kernel.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/firmware/arm_scmi/driver.c')
| -rw-r--r-- | drivers/firmware/arm_scmi/driver.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index e81cbc896f5d..2699c8efef0a 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -1895,6 +1895,13 @@ struct scmi_msg_resp_desc_fc { __le32 db_preserve_hmask; }; +#define QUIRK_PERF_FC_FORCE \ + ({ \ + if (pi->proto->id == SCMI_PROTOCOL_PERF && \ + message_id == 0x8 /* PERF_LEVEL_GET */) \ + attributes |= BIT(0); \ + }) + static void scmi_common_fastchannel_init(const struct scmi_protocol_handle *ph, u8 describe_id, u32 message_id, u32 valid_size, @@ -1915,6 +1922,7 @@ scmi_common_fastchannel_init(const struct scmi_protocol_handle *ph, /* Check if the MSG_ID supports fastchannel */ ret = scmi_protocol_msg_check(ph, message_id, &attributes); + SCMI_QUIRK(perf_level_get_fc_force, QUIRK_PERF_FC_FORCE); if (ret || !MSG_SUPPORTS_FASTCHANNEL(attributes)) { dev_dbg(ph->dev, "Skip FC init for 0x%02X/%d domain:%d - ret:%d\n", |