From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Imre Deak <imre.deak@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH v2] drm/i915/bxt: fix RC6 residency time calculation
Date: Tue, 29 Sep 2015 22:03:43 +0300 [thread overview]
Message-ID: <20150929190343.GL26517@intel.com> (raw)
In-Reply-To: <1443533326-19633-1-git-send-email-imre.deak@intel.com>
On Tue, Sep 29, 2015 at 04:28:46PM +0300, Imre Deak wrote:
> The RC6 residency time unit is 833.33ns on BXT according to the
> specification, so update the calculation accordingly. Use the same way
> as CHV/VLV to divide by the corresponding frequency, as I think this is
> the more natural unit for what the HW does internally.
>
> v2:
> - add missing IS_BROXTON check (Ville)
>
> Testcase: igt/pm_rc6_residency
> Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_sysfs.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
> index 74086eb..50ce9ce 100644
> --- a/drivers/gpu/drm/i915/i915_sysfs.c
> +++ b/drivers/gpu/drm/i915/i915_sysfs.c
> @@ -54,6 +54,9 @@ static u32 calc_residency(struct drm_device *dev, const u32 reg)
>
> if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH)
> units <<= 8;
> + } else if (IS_BROXTON(dev)) {
> + units = 1;
> + div = 1200; /* 833.33ns */
> }
>
> raw_time = I915_READ(reg) * units;
> --
> 2.1.4
--
Ville Syrjälä
Intel OTC
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next prev parent reply other threads:[~2015-09-29 19:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-29 12:07 [PATCH] drm/i915/bxt: fix RC6 residency time calculation Imre Deak
2015-09-29 13:17 ` Ville Syrjälä
2015-09-29 13:28 ` [PATCH v2] " Imre Deak
2015-09-29 19:03 ` Ville Syrjälä [this message]
2015-09-30 12:26 ` Daniel Vetter
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