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

[Daniel Vetter <daniel.vetter@xxxxxxxxx>]

On 05/08/2013 22:24, Furquan Shaikh wrote:

We tested the submitted patch on several systems here and it seems to be working fine. So, I'm not sure I understand your comment. Can you please provide more details?

You check for the bit DP_PLL_FREQ_160MHZ in the register DP_A when calculating the reference frequence for port A eDP panels (i.e. the assignement of pipe_config->port_clock). This bit is valid on port A for ivb, snb & ilk, but not on hsw. Haswell has a complete new way for assigning the pll to the port. For solid fastboot support I think we need to support them all (i.e. also the hdmi wrpll clocks and while at it we might as well write the fdi dotclock readout code, it should be almost the same as the DP dotclock computation).
-Daniel

Thanks,

Furquan

On Mon, Aug 5, 2013 at 12:24 AM, Daniel Vetter <daniel@xxxxxxxx> wrote:

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@xxxxxxxxxx>
> ---
>  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
>

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

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