From 93ee29203f506582cca2bcec5f05041526d9ab0a Mon Sep 17 00:00:00 2001 From: Tom O'Rourke Date: Wed, 19 Nov 2014 14:21:52 -0800 Subject: [PATCH] drm/i915: Use efficient frequency for HSW/BDW Added gen6_init_rps_frequencies() to initialize the rps frequency values. This function replaces parse_rp_state_cap(). In addition to reading RPn, RP0, and RP1 from RP_STATE_CAP register, the new function reads efficient frequency (aka RPe) from pcode for Haswell and Broadwell and sets the turbo softlimits. The turbo minimum frequency softlimit is set to RPe for Haswell and Broadwell and to RPn otherwise. For RPe, the efficiency is based on the frequency/power ratio (MHz/W); this is considering GT power and not package power. The efficent frequency is the highest frequency for which the frequency/power ratio is within some threshold of the highest frequency/power ratio. A fixed decrease in frequency results in smaller decrease in power at frequencies less than RPe than at frequencies above RPe. v2: Following suggestions from Chris Wilson and Daniel Vetter to extend and rename parse_rp_state_cap and to open-code a poorly named function. Signed-off-by: Tom O'Rourke Reviewed-by: Chris Wilson [danvet: Remove unused variables.] Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_pm.c | 46 +++++++++++++++++++++++---------- 2 files changed, 33 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 7a77cd5676c8..3a51c05ca552 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -6038,6 +6038,7 @@ enum punit_power_well { #define GEN6_ENCODE_RC6_VID(mv) (((mv) - 245) / 5) #define GEN6_DECODE_RC6_VID(vids) (((vids) * 5) + 245) #define DISPLAY_IPS_CONTROL 0x19 +#define HSW_PCODE_DYNAMIC_DUTY_CYCLE_CONTROL 0x1A #define GEN6_PCODE_DATA 0x138128 #define GEN6_PCODE_FREQ_IA_RATIO_SHIFT 8 #define GEN6_PCODE_FREQ_RING_RATIO_SHIFT 16 diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 417ba880c427..eb2a0a85e057 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4609,25 +4609,45 @@ int intel_enable_rc6(const struct drm_device *dev) return i915.enable_rc6; } -static void parse_rp_state_cap(struct drm_i915_private *dev_priv, u32 rp_state_cap) +static void gen6_init_rps_frequencies(struct drm_device *dev) { + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t rp_state_cap; + u32 ddcc_status = 0; + int ret; + + rp_state_cap = I915_READ(GEN6_RP_STATE_CAP); /* All of these values are in units of 50MHz */ dev_priv->rps.cur_freq = 0; - /* static values from HW: RP0 < RPe < RP1 < RPn (min_freq) */ - dev_priv->rps.rp1_freq = (rp_state_cap >> 8) & 0xff; + /* static values from HW: RP0 > RP1 > RPn (min_freq) */ dev_priv->rps.rp0_freq = (rp_state_cap >> 0) & 0xff; + dev_priv->rps.rp1_freq = (rp_state_cap >> 8) & 0xff; dev_priv->rps.min_freq = (rp_state_cap >> 16) & 0xff; - /* XXX: only BYT has a special efficient freq */ - dev_priv->rps.efficient_freq = dev_priv->rps.rp1_freq; /* hw_max = RP0 until we check for overclocking */ dev_priv->rps.max_freq = dev_priv->rps.rp0_freq; + dev_priv->rps.efficient_freq = dev_priv->rps.rp1_freq; + if (IS_HASWELL(dev) || IS_BROADWELL(dev)) { + ret = sandybridge_pcode_read(dev_priv, + HSW_PCODE_DYNAMIC_DUTY_CYCLE_CONTROL, + &ddcc_status); + if (0 == ret) + dev_priv->rps.efficient_freq = + (ddcc_status >> 8) & 0xff; + } + /* Preserve min/max settings in case of re-init */ if (dev_priv->rps.max_freq_softlimit == 0) dev_priv->rps.max_freq_softlimit = dev_priv->rps.max_freq; - if (dev_priv->rps.min_freq_softlimit == 0) - dev_priv->rps.min_freq_softlimit = dev_priv->rps.min_freq; + if (dev_priv->rps.min_freq_softlimit == 0) { + if (IS_HASWELL(dev) || IS_BROADWELL(dev)) + dev_priv->rps.min_freq_softlimit = + dev_priv->rps.efficient_freq; + else + dev_priv->rps.min_freq_softlimit = + dev_priv->rps.min_freq; + } } static void gen9_enable_rps(struct drm_device *dev) @@ -4673,7 +4693,7 @@ static void gen8_enable_rps(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; - uint32_t rc6_mask = 0, rp_state_cap; + uint32_t rc6_mask = 0; int unused; /* 1a: Software RC state - RC0 */ @@ -4686,8 +4706,8 @@ static void gen8_enable_rps(struct drm_device *dev) /* 2a: Disable RC states. */ I915_WRITE(GEN6_RC_CONTROL, 0); - rp_state_cap = I915_READ(GEN6_RP_STATE_CAP); - parse_rp_state_cap(dev_priv, rp_state_cap); + /* Initialize rps frequencies */ + gen6_init_rps_frequencies(dev); /* 2b: Program RC6 thresholds.*/ I915_WRITE(GEN6_RC6_WAKE_RATE_LIMIT, 40 << 16); @@ -4754,7 +4774,6 @@ static void gen6_enable_rps(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct intel_engine_cs *ring; - u32 rp_state_cap; u32 rc6vids, pcu_mbox = 0, rc6_mask = 0; u32 gtfifodbg; int rc6_mode; @@ -4778,9 +4797,8 @@ static void gen6_enable_rps(struct drm_device *dev) gen6_gt_force_wake_get(dev_priv, FORCEWAKE_ALL); - rp_state_cap = I915_READ(GEN6_RP_STATE_CAP); - - parse_rp_state_cap(dev_priv, rp_state_cap); + /* Initialize rps frequencies */ + gen6_init_rps_frequencies(dev); /* disable the counters and set deterministic thresholds */ I915_WRITE(GEN6_RC_CONTROL, 0); -- 2.20.1