linux-kernel - Re: [PATCH] drm/i915: add fast boot support for Haswell

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Message-ID: <20130805072421.GV22035@phenom.ffwll.local>
Date:	Mon, 5 Aug 2013 09:24:21 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Furquan Shaikh <furquan@...gle.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Josh Triplett <josh.triplett@...el.com>,
	Paulo Zanoni <paulo.r.zanoni@...el.com>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	Ronald Minnich <rminnich@...gle.com>,
	Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH] drm/i915: add fast boot support for Haswell

On Thu, Aug 01, 2013 at 02:12:22PM -0700, Furquan Shaikh wrote:
> Enables getting correct mode clock when reading pipe config
> 
> Signed-off-by: Furquan Shaikh <furquan@...gle.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c     | 8 ++++++++
>  drivers/gpu/drm/i915/intel_display.c | 9 ++++++++-
>  2 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 931b4bb..fa0af9b 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1269,6 +1269,7 @@ static void intel_ddi_get_config(struct intel_encoder *encoder,
>  	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
>  	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
>  	enum transcoder cpu_transcoder = intel_crtc->config.cpu_transcoder;
> +	int port = intel_ddi_get_encoder_port(encoder);
>  	u32 temp, flags = 0;
>  
>  	temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
> @@ -1282,6 +1283,13 @@ static void intel_ddi_get_config(struct intel_encoder *encoder,
>  		flags |= DRM_MODE_FLAG_NVSYNC;
>  
>  	pipe_config->adjusted_mode.flags |= flags;
> +
> +	if (port == PORT_A) {
> +		if ((I915_READ(DP_A) & DP_PLL_FREQ_MASK) == DP_PLL_FREQ_160MHZ)
> +			pipe_config->port_clock = 162000;
> +		else
> +			pipe_config->port_clock = 270000;
> +	}

I don't think this works correctly since for DP we have new clocks on
haswell, see intel_ddi_pll_mode_set. Also I think it'd be good to go right
ahead and implement clock readout support for all hsw clock sources, not
just DP.
-Daniel

>  }
>  
>  static void intel_ddi_destroy(struct drm_encoder *encoder)
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 3e66f05..681c99a 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -7176,6 +7176,8 @@ static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
>  		pipe_config->pixel_multiplier;
>  }
>  
> +#define div_ceil(A, B) ((A)/(B) + ((A)%(B) ? 1 : 0))
> +
>  static void ironlake_crtc_clock_get(struct intel_crtc *crtc,
>  				    struct intel_crtc_config *pipe_config)
>  {
> @@ -7218,7 +7220,11 @@ static void ironlake_crtc_clock_get(struct intel_crtc *crtc,
>  		return;
>  
>  	clock = ((u64)link_m * (u64)link_freq * (u64)repeat);
> -	do_div(clock, link_n);
> +	/* This is required because the value comes out to be in fraction
> +	   (eg. 70699.54). Need to round it up since values are compared in
> +	   drm_mode_equal
> +	*/
> +	clock = div_ceil(clock, link_n);
>  
>  	pipe_config->adjusted_mode.clock = clock;
>  }
> @@ -9588,6 +9594,7 @@ static void intel_init_display(struct drm_device *dev)
>  
>  	if (HAS_DDI(dev)) {
>  		dev_priv->display.get_pipe_config = haswell_get_pipe_config;
> +		dev_priv->display.get_clock = ironlake_crtc_clock_get;
>  		dev_priv->display.crtc_mode_set = haswell_crtc_mode_set;
>  		dev_priv->display.crtc_enable = haswell_crtc_enable;
>  		dev_priv->display.crtc_disable = haswell_crtc_disable;
> -- 
> 1.8.3
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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