diff options
| author | Simon Glass <sjg@chromium.org> | 2024-08-27 19:44:27 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2024-10-18 14:10:21 -0600 |
| commit | ecf31113f17817f5ab9263937270255b6d05cdf9 (patch) | |
| tree | 225926d81f56e26a2e59a7f27b3ab0e9c418bd8f | |
| parent | 7c0f70b65b7c6ab0c09f87932615c65142542ed5 (diff) | |
x86: Sync up tsc_timer with Linux
Since we are using the code from Linux, update it to the newer version
in v6.11
Signed-off-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | drivers/timer/tsc_timer.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/timer/tsc_timer.c b/drivers/timer/tsc_timer.c index 2f2c2f27b7f..dd16ab320b2 100644 --- a/drivers/timer/tsc_timer.c +++ b/drivers/timer/tsc_timer.c @@ -83,7 +83,7 @@ static unsigned long cpu_mhz_from_cpuid(void) if (cpuid_eax(0) < 0x16) return 0; - return cpuid_eax(0x16); + return cpuid_eax(0x15); } /* @@ -299,10 +299,19 @@ static unsigned long __maybe_unused quick_pit_calibrate(void) if (!pit_expect_msb(0xff-i, &delta, &d2)) break; + delta -= tsc; + + /* + * Extrapolate the error and fail fast if the error will + * never be below 500 ppm. + */ + if (i == 1 && + d1 + d2 >= (delta * MAX_QUICK_PIT_ITERATIONS) >> 11) + return 0; + /* * Iterate until the error is less than 500 ppm */ - delta -= tsc; if (d1+d2 >= delta >> 11) continue; |