Re: [PATCH 4/5] drm/i915/vlv: factor out vlv_calc_port_clock

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Jun 18, 2015 at 05:25:56PM +0300, Imre Deak wrote:
> This functionality will be needed by the next patch adding HW readout
> support for DDI ports on BXT, so factor it out.
> 
> No functional change.
> 
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 18 ++++++++++--------
>  drivers/gpu/drm/i915/intel_drv.h     |  2 ++
>  2 files changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 0e5c613..6cf2a15 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -7993,6 +7993,14 @@ static void i9xx_get_pfit_config(struct intel_crtc *crtc,
>  			I915_READ(LVDS) & LVDS_BORDER_ENABLE;
>  }
>  
> +int vlv_calc_port_clock(int refclk, intel_clock_t *pll_clock)

It doesn't work for VLV, so the name is misleading.

> +{
> +	chv_clock(refclk, pll_clock);
> +
> +	/* clock.dot is the fast clock */
> +	return pll_clock->dot / 5;
> +}

Maybe just make chv_clock() return the divided down clock directtly
instead of adding this extra wrapper.

Though in that case I'd prefer if you change all the vlv_clock(),
i9xx_clock()... functions to do the same, just to keep the code
as similar as possible between platforms.

> +
>  static void vlv_crtc_clock_get(struct intel_crtc *crtc,
>  			       struct intel_crtc_state *pipe_config)
>  {
> @@ -8017,10 +8025,7 @@ static void vlv_crtc_clock_get(struct intel_crtc *crtc,
>  	clock.p1 = (mdiv >> DPIO_P1_SHIFT) & 7;
>  	clock.p2 = (mdiv >> DPIO_P2_SHIFT) & 0x1f;
>  
> -	vlv_clock(refclk, &clock);
> -
> -	/* clock.dot is the fast clock */
> -	pipe_config->port_clock = clock.dot / 5;
> +	pipe_config->port_clock = vlv_calc_port_clock(refclk, &clock);
>  }
>  
>  static void
> @@ -8116,10 +8121,7 @@ static void chv_crtc_clock_get(struct intel_crtc *crtc,
>  	clock.p1 = (cmn_dw13 >> DPIO_CHV_P1_DIV_SHIFT) & 0x7;
>  	clock.p2 = (cmn_dw13 >> DPIO_CHV_P2_DIV_SHIFT) & 0x1f;
>  
> -	chv_clock(refclk, &clock);
> -
> -	/* clock.dot is the fast clock */
> -	pipe_config->port_clock = clock.dot / 5;
> +	pipe_config->port_clock = vlv_calc_port_clock(refclk, &clock);
>  }
>  
>  static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index bcafefc..95e14bb 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1139,6 +1139,8 @@ ironlake_check_encoder_dotclock(const struct intel_crtc_state *pipe_config,
>  				int dotclock);
>  bool bxt_find_best_dpll(struct intel_crtc_state *crtc_state, int target_clock,
>  			intel_clock_t *best_clock);
> +int vlv_calc_port_clock(int refclk, intel_clock_t *pll_clock);
> +
>  bool intel_crtc_active(struct drm_crtc *crtc);
>  void hsw_enable_ips(struct intel_crtc *crtc);
>  void hsw_disable_ips(struct intel_crtc *crtc);
> -- 
> 2.1.4
> 
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-- 
Ville Syrjälä
Intel OTC
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