Re: [PATCH] drm/i915: shovel compute clock into crtc->config.dpll on ilk

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

On Sat, Apr 20, 2013 at 05:19:46PM +0200, Daniel Vetter wrote:
> This was somehow lost in the pipe_config->dpll introduction in
> 
> commit f47709a9502f3715cc488b788ca91cf0c142b1b1
> Author: Daniel Vetter <daniel.vetter@ffwll.ch>
> Date:   Thu Mar 28 10:42:02 2013 +0100
> 
>     drm/i915: create pipe_config->dpll for clock state
> 
> While at it, extract a few small helpers for common computations.
> 
> v2: Use the newly added helpers more thanks to Ville's trick to
> typedef the legacy intel_clock_t as the new-world struct dpll.
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 50 ++++++++++++++++++++++++------------
>  1 file changed, 33 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 88c19bb..63c6557 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -549,13 +549,18 @@ static void pineview_clock(int refclk, intel_clock_t *clock)
>  	clock->dot = clock->vco / clock->p;
>  }
>  
> +static uint32_t i9xx_dpll_compute_m(struct dpll *dpll)
> +{
> +	return 5 * (dpll->m1 + 2) + (dpll->m2 + 2);
> +}

intel_find_pll_g4x_dp() has another use of this formula.

Otherwise everything looks good to me.

> +
>  static void intel_clock(struct drm_device *dev, int refclk, intel_clock_t *clock)
>  {
>  	if (IS_PINEVIEW(dev)) {
>  		pineview_clock(refclk, clock);
>  		return;
>  	}
> -	clock->m = 5 * (clock->m1 + 2) + (clock->m2 + 2);
> +	clock->m = i9xx_dpll_compute_m(clock);
>  	clock->p = clock->p1 * clock->p2;
>  	clock->vco = refclk * clock->m / (clock->n + 2);
>  	clock->dot = clock->vco / clock->p;
> @@ -4241,6 +4246,16 @@ static void i9xx_adjust_sdvo_tv_clock(struct intel_crtc *crtc)
>  	crtc->config.clock_set = true;
>  }
>  
> +static uint32_t pnv_dpll_compute_fp(struct dpll *dpll)
> +{
> +	return (1 << dpll->n) << 16 | dpll->m1 << 8 | dpll->m2;
> +}
> +
> +static uint32_t i9xx_dpll_compute_fp(struct dpll *dpll)
> +{
> +	return dpll->n << 16 | dpll->m1 << 8 | dpll->m2;
> +}
> +
>  static void i9xx_update_pll_dividers(struct intel_crtc *crtc,
>  				     intel_clock_t *reduced_clock)
>  {
> @@ -4248,18 +4263,15 @@ static void i9xx_update_pll_dividers(struct intel_crtc *crtc,
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	int pipe = crtc->pipe;
>  	u32 fp, fp2 = 0;
> -	struct dpll *clock = &crtc->config.dpll;
>  
>  	if (IS_PINEVIEW(dev)) {
> -		fp = (1 << clock->n) << 16 | clock->m1 << 8 | clock->m2;
> +		fp = pnv_dpll_compute_fp(&crtc->config.dpll);
>  		if (reduced_clock)
> -			fp2 = (1 << reduced_clock->n) << 16 |
> -				reduced_clock->m1 << 8 | reduced_clock->m2;
> +			fp2 = pnv_dpll_compute_fp(reduced_clock);
>  	} else {
> -		fp = clock->n << 16 | clock->m1 << 8 | clock->m2;
> +		fp = i9xx_dpll_compute_fp(&crtc->config.dpll);
>  		if (reduced_clock)
> -			fp2 = reduced_clock->n << 16 | reduced_clock->m1 << 8 |
> -				reduced_clock->m2;
> +			fp2 = i9xx_dpll_compute_fp(reduced_clock);
>  	}
>  
>  	I915_WRITE(FP0(pipe), fp);
> @@ -5592,8 +5604,13 @@ static void ironlake_fdi_set_m_n(struct drm_crtc *crtc)
>  	intel_cpu_transcoder_set_m_n(intel_crtc, &m_n);
>  }
>  
> +static bool ironlake_needs_fb_cb_tune(struct dpll *dpll, int factor)
> +{
> +	return i9xx_dpll_compute_m(dpll) < factor * dpll->n;
> +}
> +
>  static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
> -				      intel_clock_t *clock, u32 *fp,
> +				      u32 *fp,
>  				      intel_clock_t *reduced_clock, u32 *fp2)
>  {
>  	struct drm_crtc *crtc = &intel_crtc->base;
> @@ -5633,7 +5650,7 @@ static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
>  	} else if (is_sdvo && is_tv)
>  		factor = 20;
>  
> -	if (clock->m < factor * clock->n)
> +	if (ironlake_needs_fb_cb_tune(&intel_crtc->config.dpll, factor))
>  		*fp |= FP_CB_TUNE;
>  
>  	if (fp2 && (reduced_clock->m < factor * reduced_clock->n))
> @@ -5657,11 +5674,11 @@ static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
>  		dpll |= DPLL_DVO_HIGH_SPEED;
>  
>  	/* compute bitmask from p1 value */
> -	dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
> +	dpll |= (1 << (intel_crtc->config.dpll.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
>  	/* also FPA1 */
> -	dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
> +	dpll |= (1 << (intel_crtc->config.dpll.p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
>  
> -	switch (clock->p2) {
> +	switch (intel_crtc->config.dpll.p2) {
>  	case 5:
>  		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
>  		break;
> @@ -5756,12 +5773,11 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
>  	if (intel_crtc->config.has_pch_encoder) {
>  		struct intel_pch_pll *pll;
>  
> -		fp = clock.n << 16 | clock.m1 << 8 | clock.m2;
> +		fp = i9xx_dpll_compute_fp(&intel_crtc->config.dpll);
>  		if (has_reduced_clock)
> -			fp2 = reduced_clock.n << 16 | reduced_clock.m1 << 8 |
> -				reduced_clock.m2;
> +			fp2 = i9xx_dpll_compute_fp(&reduced_clock);
>  
> -		dpll = ironlake_compute_dpll(intel_crtc, &clock,
> +		dpll = ironlake_compute_dpll(intel_crtc,
>  					     &fp, &reduced_clock,
>  					     has_reduced_clock ? &fp2 : NULL);
>  
> -- 
> 1.7.11.7

-- 
Ville Syrjälä
Intel OTC