From: Imre Deak <imre.deak@intel.com>
To: ville.syrjala@linux.intel.com, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 07/13] drm/i915: Remove 10% cdclk guardband on BXT
Date: Thu, 12 May 2016 19:42:39 +0300 [thread overview]
Message-ID: <1463071359.15147.34.camel@intel.com> (raw)
In-Reply-To: <1462995892-32416-8-git-send-email-ville.syrjala@linux.intel.com>
On Wed, 2016-05-11 at 22:44 +0300, ville.syrjala@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> We don't need any pixel clock vs. cdclk guardband since HSW. BXT still
> tries to add one though. Get rid of it.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Matches "Gen9 Display Resolution Support" which only sets scaling
specific limits and doesn't mention the "90% rule" required by the IVB
"Pixel Rate Limitations":
Reviewed-by: Imre Deak <imre.deak@intel.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 9564719b53e3..57ff51172065 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5905,16 +5905,15 @@ static int broxton_calc_cdclk(int max_pixclk)
> {
> /*
> * FIXME:
> - * - remove the guardband, it's not needed on BXT
> * - set 19.2MHz bypass frequency if there are no active pipes
> */
> - if (max_pixclk > 576000*9/10)
> + if (max_pixclk > 576000)
> return 624000;
> - else if (max_pixclk > 384000*9/10)
> + else if (max_pixclk > 384000)
> return 576000;
> - else if (max_pixclk > 288000*9/10)
> + else if (max_pixclk > 288000)
> return 384000;
> - else if (max_pixclk > 144000*9/10)
> + else if (max_pixclk > 144000)
> return 288000;
> else
> return 144000;
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next prev parent reply other threads:[~2016-05-12 16:42 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-11 19:44 [PATCH 00/13] drm/i915: cdclk code cleanup ville.syrjala
2016-05-11 19:44 ` [PATCH 01/13] drm/i915: Drop checks for max_pixclk failures in cdclk computation ville.syrjala
2016-05-12 10:02 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 02/13] drm/i915: Extract broadwell_calc_cdclk() ville.syrjala
2016-05-12 10:03 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 03/13] drm/i915: Untangle .fdi_link_train and cdclk vfunc setup ville.syrjala
2016-05-12 10:06 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 04/13] drm/i915: Don't pass dev_priv to broxton_calc_cdclk() ville.syrjala
2016-05-12 10:07 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 05/13] drm/i915: Use ilk_max_pixel_rate() for BXT cdclk calculation ville.syrjala
2016-05-12 10:13 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 06/13] drm/i915: Use skl_cdclk_decimal() on bxt ville.syrjala
2016-05-12 10:23 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 07/13] drm/i915: Remove 10% cdclk guardband on BXT ville.syrjala
2016-05-12 16:42 ` Imre Deak [this message]
2016-05-11 19:44 ` [PATCH 08/13] drm/i915: Extract skl_dpll0_disable() ville.syrjala
2016-05-12 10:25 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 09/13] drm/i915: Kill off dead code from skl_dpll0_enable() ville.syrjala
2016-05-12 10:26 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 10/13] drm/i915: s/freq/cdclk/ ville.syrjala
2016-05-12 10:28 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 11/13] drm/i915: s/required_vco/vco/ in skl cdclk code ville.syrjala
2016-05-12 10:29 ` Jani Nikula
2016-05-11 19:44 ` [PATCH 12/13] drm/i915: Program BXT_CDCLK_CD2X_PIPE ville.syrjala
2016-05-12 16:58 ` Imre Deak
2016-05-11 19:44 ` [PATCH 13/13] drm/i915: Eliminate the CDCLK_CTL RMW on BXT ville.syrjala
2016-05-12 17:05 ` Imre Deak
2016-05-11 20:23 ` ✗ Ro.CI.BAT: failure for drm/i915: cdclk code cleanup Patchwork
2016-05-12 15:16 ` Ville Syrjälä
2016-05-13 18:42 ` [PATCH 00/13] " Ville Syrjälä
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