drm/i915/gt: Consolidate the CS timestamp clocks

Pull the GT clock information [used to derive CS timestamps and PM
interval] under the GT so that is it local to the users. In doing so, we
consolidate the two references for the same information, of which the
runtime-info took note of a potential clock source override and scaling
factors.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201223122359.22562-2-chris@chris-wilson.co.uk

1 files changed, 0 insertions, 157 deletions

diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index e67cec8fa2aa..55ccb87a6670 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -117,150 +117,6 @@ void intel_device_info_print_runtime(const struct intel_runtime_info *info,
 				     struct drm_printer *p)
 {
 	drm_printf(p, "rawclk rate: %u kHz\n", info->rawclk_freq);
-	drm_printf(p, "CS timestamp frequency: %u Hz\n",
-		   info->cs_timestamp_frequency_hz);
-}
-
-static u32 read_reference_ts_freq(struct drm_i915_private *dev_priv)
-{
-	u32 ts_override = intel_uncore_read(&dev_priv->uncore,
-					    GEN9_TIMESTAMP_OVERRIDE);
-	u32 base_freq, frac_freq;
-
-	base_freq = ((ts_override & GEN9_TIMESTAMP_OVERRIDE_US_COUNTER_DIVIDER_MASK) >>
-		     GEN9_TIMESTAMP_OVERRIDE_US_COUNTER_DIVIDER_SHIFT) + 1;
-	base_freq *= 1000000;
-
-	frac_freq = ((ts_override &
-		      GEN9_TIMESTAMP_OVERRIDE_US_COUNTER_DENOMINATOR_MASK) >>
-		     GEN9_TIMESTAMP_OVERRIDE_US_COUNTER_DENOMINATOR_SHIFT);
-	frac_freq = 1000000 / (frac_freq + 1);
-
-	return base_freq + frac_freq;
-}
-
-static u32 gen10_get_crystal_clock_freq(struct drm_i915_private *dev_priv,
-					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 drm_i915_private *dev_priv,
-					u32 rpm_config_reg)
-{
-	u32 f19_2_mhz = 19200000;
-	u32 f24_mhz = 24000000;
-	u32 f25_mhz = 25000000;
-	u32 f38_4_mhz = 38400000;
-	u32 crystal_clock = (rpm_config_reg &
-			     GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_MASK) >>
-			    GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_SHIFT;
-
-	switch (crystal_clock) {
-	case GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_24_MHZ:
-		return f24_mhz;
-	case GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_19_2_MHZ:
-		return f19_2_mhz;
-	case GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_38_4_MHZ:
-		return f38_4_mhz;
-	case GEN11_RPM_CONFIG0_CRYSTAL_CLOCK_FREQ_25_MHZ:
-		return f25_mhz;
-	default:
-		MISSING_CASE(crystal_clock);
-		return 0;
-	}
-}
-
-static u32 read_timestamp_frequency(struct drm_i915_private *dev_priv)
-{
-	struct intel_uncore *uncore = &dev_priv->uncore;
-	u32 f12_5_mhz = 12500000;
-	u32 f19_2_mhz = 19200000;
-	u32 f24_mhz = 24000000;
-
-	if (INTEL_GEN(dev_priv) <= 4) {
-		/* PRMs say:
-		 *
-		 *     "The value in this register increments once every 16
-		 *      hclks." (through the “Clocking Configuration”
-		 *      (“CLKCFG”) MCHBAR register)
-		 */
-		return RUNTIME_INFO(dev_priv)->rawclk_freq * 1000 / 16;
-	} else if (INTEL_GEN(dev_priv) <= 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).
-		 */
-		return f12_5_mhz;
-	} else if (INTEL_GEN(dev_priv) <= 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(dev_priv);
-		} else {
-			freq = IS_GEN9_LP(dev_priv) ? 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 (INTEL_GEN(dev_priv) <= 12) {
-		u32 ctc_reg = intel_uncore_read(uncore, CTC_MODE);
-		u32 freq = 0;
-
-		/* 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(dev_priv);
-		} else {
-			u32 rpm_config_reg = intel_uncore_read(uncore, RPM_CONFIG0);
-
-			if (INTEL_GEN(dev_priv) <= 10)
-				freq = gen10_get_crystal_clock_freq(dev_priv,
-								rpm_config_reg);
-			else
-				freq = gen11_get_crystal_clock_freq(dev_priv,
-								rpm_config_reg);
-
-			/* Now figure out how the command stream's timestamp
-			 * register increments from this frequency (it might
-			 * increment only every few clock cycle).
-			 */
-			freq >>= 3 - ((rpm_config_reg &
-				       GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_MASK) >>
-				      GEN10_RPM_CONFIG0_CTC_SHIFT_PARAMETER_SHIFT);
-		}
-
-		return freq;
-	}
-
-	MISSING_CASE("Unknown gen, unable to read command streamer timestamp frequency\n");
-	return 0;
 }
 
 #undef INTEL_VGA_DEVICE
@@ -505,19 +361,6 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
 	runtime->rawclk_freq = intel_read_rawclk(dev_priv);
 	drm_dbg(&dev_priv->drm, "rawclk rate: %d kHz\n", runtime->rawclk_freq);
 
-	/* Initialize command stream timestamp frequency */
-	runtime->cs_timestamp_frequency_hz =
-		read_timestamp_frequency(dev_priv);
-	if (runtime->cs_timestamp_frequency_hz) {
-		runtime->cs_timestamp_period_ns =
-			i915_cs_timestamp_ticks_to_ns(dev_priv, 1);
-		drm_dbg(&dev_priv->drm,
-			"CS timestamp wraparound in %lldms\n",
-			div_u64(mul_u32_u32(runtime->cs_timestamp_period_ns,
-					    S32_MAX),
-				USEC_PER_SEC));
-	}
-
 	if (!HAS_DISPLAY(dev_priv)) {
 		dev_priv->drm.driver_features &= ~(DRIVER_MODESET |
 						   DRIVER_ATOMIC);