diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c | 174 |
1 files changed, 81 insertions, 93 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c b/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c index d5d1b04dbcad..3f656d3dba9a 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_clock_utils.c @@ -26,26 +26,6 @@ static u32 read_reference_ts_freq(struct intel_uncore *uncore) return base_freq + frac_freq; } -static u32 gen9_get_crystal_clock_freq(struct intel_uncore *uncore, - u32 rpm_config_reg) -{ - u32 f19_2_mhz = 19200000; - u32 f24_mhz = 24000000; - u32 crystal_clock = - (rpm_config_reg & GEN9_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_MASK) >> - GEN9_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_SHIFT; - - switch (crystal_clock) { - case GEN9_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_19_2_MHZ: - return f19_2_mhz; - case GEN9_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_24_MHZ: - return f24_mhz; - default: - MISSING_CASE(crystal_clock); - return 0; - } -} - static u32 gen11_get_crystal_clock_freq(struct intel_uncore *uncore, u32 rpm_config_reg) { @@ -72,98 +52,106 @@ static u32 gen11_get_crystal_clock_freq(struct intel_uncore *uncore, } } -static u32 read_clock_frequency(struct intel_uncore *uncore) +static u32 gen11_read_clock_frequency(struct intel_uncore *uncore) { - u32 f12_5_mhz = 12500000; - u32 f19_2_mhz = 19200000; - u32 f24_mhz = 24000000; + u32 ctc_reg = intel_uncore_read(uncore, CTC_MODE); + u32 freq = 0; + + /* + * Note that on gen11+, the clock frequency may be reconfigured. + * We do not, and we assume nobody else does. + * + * First figure out the reference frequency. There are 2 ways + * we can compute the frequency, either through the + * TIMESTAMP_OVERRIDE register or through RPM_CONFIG. CTC_MODE + * tells us which one we should use. + */ + if ((ctc_reg & CTC_SOURCE_PARAMETER_MASK) == CTC_SOURCE_DIVIDE_LOGIC) { + freq = read_reference_ts_freq(uncore); + } else { + u32 c0 = intel_uncore_read(uncore, RPM_CONFIG0); + + freq = gen11_get_crystal_clock_freq(uncore, c0); - if (GRAPHICS_VER(uncore->i915) <= 4) { - /* - * PRMs say: - * - * "The value in this register increments once every 16 - * hclks." (through the “Clocking Configuration” - * (“CLKCFG”) MCHBAR register) - */ - return RUNTIME_INFO(uncore->i915)->rawclk_freq * 1000 / 16; - } else if (GRAPHICS_VER(uncore->i915) <= 8) { /* - * PRMs say: - * - * "The PCU TSC counts 10ns increments; this timestamp - * reflects bits 38:3 of the TSC (i.e. 80ns granularity, - * rolling over every 1.5 hours). + * Now figure out how the command stream's timestamp + * register increments from this frequency (it might + * increment only every few clock cycle). */ - return f12_5_mhz; - } else if (GRAPHICS_VER(uncore->i915) <= 9) { - u32 ctc_reg = intel_uncore_read(uncore, CTC_MODE); - u32 freq = 0; - - if ((ctc_reg & CTC_SOURCE_PARAMETER_MASK) == CTC_SOURCE_DIVIDE_LOGIC) { - freq = read_reference_ts_freq(uncore); - } else { - freq = IS_GEN9_LP(uncore->i915) ? f19_2_mhz : f24_mhz; - - /* - * Now figure out how the command stream's timestamp - * register increments from this frequency (it might - * increment only every few clock cycle). - */ - freq >>= 3 - ((ctc_reg & CTC_SHIFT_PARAMETER_MASK) >> - CTC_SHIFT_PARAMETER_SHIFT); - } - - return freq; - } else if (GRAPHICS_VER(uncore->i915) <= 12) { - u32 ctc_reg = intel_uncore_read(uncore, CTC_MODE); - u32 freq = 0; + freq >>= 3 - ((c0 & GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_MASK) >> + GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_SHIFT); + } + + return freq; +} + +static u32 gen9_read_clock_frequency(struct intel_uncore *uncore) +{ + u32 ctc_reg = intel_uncore_read(uncore, CTC_MODE); + u32 freq = 0; + + if ((ctc_reg & CTC_SOURCE_PARAMETER_MASK) == CTC_SOURCE_DIVIDE_LOGIC) { + freq = read_reference_ts_freq(uncore); + } else { + freq = IS_GEN9_LP(uncore->i915) ? 19200000 : 24000000; /* - * First figure out the reference frequency. There are 2 ways - * we can compute the frequency, either through the - * TIMESTAMP_OVERRIDE register or through RPM_CONFIG. CTC_MODE - * tells us which one we should use. + * Now figure out how the command stream's timestamp + * register increments from this frequency (it might + * increment only every few clock cycle). */ - if ((ctc_reg & CTC_SOURCE_PARAMETER_MASK) == CTC_SOURCE_DIVIDE_LOGIC) { - freq = read_reference_ts_freq(uncore); - } else { - u32 c0 = intel_uncore_read(uncore, RPM_CONFIG0); - - if (GRAPHICS_VER(uncore->i915) >= 11) - freq = gen11_get_crystal_clock_freq(uncore, c0); - else - freq = gen9_get_crystal_clock_freq(uncore, c0); - - /* - * Now figure out how the command stream's timestamp - * register increments from this frequency (it might - * increment only every few clock cycle). - */ - freq >>= 3 - ((c0 & GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_MASK) >> - GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_SHIFT); - } - - return freq; + freq >>= 3 - ((ctc_reg & CTC_SHIFT_PARAMETER_MASK) >> + CTC_SHIFT_PARAMETER_SHIFT); } - MISSING_CASE("Unknown gen, unable to read command streamer timestamp frequency\n"); - return 0; + return freq; } -void intel_gt_init_clock_frequency(struct intel_gt *gt) +static u32 gen5_read_clock_frequency(struct intel_uncore *uncore) { /* - * Note that on gen11+, the clock frequency may be reconfigured. - * We do not, and we assume nobody else does. + * PRMs say: + * + * "The PCU TSC counts 10ns increments; this timestamp + * reflects bits 38:3 of the TSC (i.e. 80ns granularity, + * rolling over every 1.5 hours). + */ + return 12500000; +} + +static u32 gen2_read_clock_frequency(struct intel_uncore *uncore) +{ + /* + * PRMs say: + * + * "The value in this register increments once every 16 + * hclks." (through the “Clocking Configuration” + * (“CLKCFG”) MCHBAR register) */ + return RUNTIME_INFO(uncore->i915)->rawclk_freq * 1000 / 16; +} + +static u32 read_clock_frequency(struct intel_uncore *uncore) +{ + if (GRAPHICS_VER(uncore->i915) >= 11) + return gen11_read_clock_frequency(uncore); + else if (GRAPHICS_VER(uncore->i915) >= 9) + return gen9_read_clock_frequency(uncore); + else if (GRAPHICS_VER(uncore->i915) >= 5) + return gen5_read_clock_frequency(uncore); + else + return gen2_read_clock_frequency(uncore); +} + +void intel_gt_init_clock_frequency(struct intel_gt *gt) +{ gt->clock_frequency = read_clock_frequency(gt->uncore); - if (gt->clock_frequency) - gt->clock_period_ns = intel_gt_clock_interval_to_ns(gt, 1); /* Icelake appears to use another fixed frequency for CTX_TIMESTAMP */ if (GRAPHICS_VER(gt->i915) == 11) gt->clock_period_ns = NSEC_PER_SEC / 13750000; + else if (gt->clock_frequency) + gt->clock_period_ns = intel_gt_clock_interval_to_ns(gt, 1); GT_TRACE(gt, "Using clock frequency: %dkHz, period: %dns, wrap: %lldms\n", |