diff options
| -rw-r--r-- | tools/intel_reg_dumper.c | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/tools/intel_reg_dumper.c b/tools/intel_reg_dumper.c index 56504694..1d44660f 100644 --- a/tools/intel_reg_dumper.c +++ b/tools/intel_reg_dumper.c @@ -2798,6 +2798,43 @@ intel_dump_other_regs(void) } } +/* + * This program reads a lot of display registers. If we don't turn on the power + * well, dmesg will get flooded with tons of messages about unclaimed registers. + * So here we enable the "Debug" power well register and then restore its state + * later. It's impossible to guarantee that other things won't mess with the + * debug register between our put and get calls, but at least we're trying our + * best to keep things working fine, and it's the debug register anyway. + */ +static uint32_t power_well_get(void) +{ + uint32_t ret; + int i; + + if (!IS_HASWELL(devid)) + return 0; + + ret = INREG(HSW_PWR_WELL_CTL4) & HSW_PWR_WELL_ENABLE; + + OUTREG(HSW_PWR_WELL_CTL4, HSW_PWR_WELL_ENABLE); + + for (i = 0; i < 20; i++) { + if (INREG(HSW_PWR_WELL_CTL4) & HSW_PWR_WELL_STATE) + break; + usleep(1000); + } + + return ret; +} + +static void power_well_put(uint32_t power_well) +{ + if (!IS_HASWELL(devid)) + return; + + OUTREG(HSW_PWR_WELL_CTL4, power_well); +} + static void print_usage(void) { printf("Usage: intel_reg_dumper [options] [file]\n" @@ -2813,7 +2850,7 @@ int main(int argc, char** argv) struct pci_device *pci_dev; int opt, n_args; char *file = NULL, *reg_name = NULL; - uint32_t reg_val; + uint32_t reg_val, power_well; while ((opt = getopt(argc, argv, "d:h")) != -1) { switch (opt) { @@ -2874,6 +2911,8 @@ int main(int argc, char** argv) intel_check_pch(); } + power_well = power_well_get(); + if (IS_HASWELL(devid)) { intel_dump_regs(haswell_debug_regs); } else if (IS_GEN5(devid) || IS_GEN6(devid) || IS_IVYBRIDGE(devid)) { @@ -2890,6 +2929,8 @@ int main(int argc, char** argv) if (IS_GEN6(devid) || IS_GEN7(devid)) intel_dump_regs(gen6_rp_debug_regs); + power_well_put(power_well); + intel_register_access_fini(); return 0; } |