lkml.org 
[lkml]   [2022]   [Jul]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.18 173/231] platform/x86: thinkpad_acpi: do not use PSC mode on Intel platforms
Date
From: Mark Pearson <markpearson@lenovo.com>

[ Upstream commit bce6243f767f7da88aa4674d5d678f9f156eaba9 ]

PSC platform profile mode is only supported on Linux for AMD platforms.

Some older Intel platforms (e.g T490) are advertising it's capability
as Windows uses it - but on Linux we should only be using MMC profile
for Intel systems.

Add a check to prevent it being enabled incorrectly.

Signed-off-by: Mark Pearson <markpearson@lenovo.com>
Link: https://lore.kernel.org/r/20220627181449.3537-1-markpearson@lenovo.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/platform/x86/thinkpad_acpi.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -10541,6 +10541,11 @@ static int tpacpi_dytc_profile_init(stru
dytc_mmc_get_available = true;
}
} else if (dytc_capabilities & BIT(DYTC_FC_PSC)) { /* PSC MODE */
+ /* Support for this only works on AMD platforms */
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD) {
+ dbg_printk(TPACPI_DBG_INIT, "PSC not support on Intel platforms\n");
+ return -ENODEV;
+ }
pr_debug("PSC is supported\n");
} else {
dbg_printk(TPACPI_DBG_INIT, "No DYTC support available\n");

\
 
 \ /
  Last update: 2022-07-19 15:06    [W:0.045 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site