[PATCH 7/8] drm/i915: extract pch_pll_set from ironlake_crtc_mode_set

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On Wed, Sep 12, 2012 at 10:06:35AM -0300, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> This is all the code responsible for setting the PCH PLLs.
> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c |  260 ++++++++++++++++++++--------------
>  1 file changed, 153 insertions(+), 107 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index dc4132a..7ffbcfd 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -4884,6 +4884,143 @@ static bool ironlake_compute_clocks(struct drm_crtc *crtc,
>  	return true;
>  }
>  
> +static bool ironlake_pch_pll_set(struct drm_crtc *crtc,
> +				 struct drm_display_mode *adjusted_mode,
> +				 intel_clock_t *clock,
> +				 bool has_reduced_clock,
> +				 intel_clock_t *reduced_clock)
> +{
> +	struct drm_device *dev = crtc->dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct intel_encoder *intel_encoder;
> +	int num_connectors = 0;
> +	u32 dpll, fp = 0, fp2 = 0;
> +	int factor, pixel_multiplier;
> +	struct intel_pch_pll *pll;
> +	bool is_lvds = false, is_sdvo = false, is_tv = false;
> +	bool is_dp = false, is_cpu_edp = false;
> +
> +	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
> +		switch (intel_encoder->type) {
> +		case INTEL_OUTPUT_LVDS:
> +			is_lvds = true;
> +			break;
> +		case INTEL_OUTPUT_SDVO:
> +		case INTEL_OUTPUT_HDMI:
> +			is_sdvo = true;
> +			if (intel_encoder->needs_tv_clock)
> +				is_tv = true;
> +			break;
> +		case INTEL_OUTPUT_TVOUT:
> +			is_tv = true;
> +			break;
> +		case INTEL_OUTPUT_DISPLAYPORT:
> +			is_dp = true;
> +			break;
> +		case INTEL_OUTPUT_EDP:
> +			is_dp = true;
> +			if (!intel_encoder_is_pch_edp(&intel_encoder->base))
> +				is_cpu_edp = true;
> +			break;
> +		}
> +
> +		num_connectors++;
> +	}
> +
> +	fp = clock->n << 16 | clock->m1 << 8 | clock->m2;
> +	if (has_reduced_clock)
> +		fp2 = reduced_clock->n << 16 | reduced_clock->m1 << 8 |
> +			reduced_clock->m2;
> +
> +	/* Enable autotuning of the PLL clock (if permissible) */
> +	factor = 21;
> +	if (is_lvds) {
> +		if ((intel_panel_use_ssc(dev_priv) &&
> +		     dev_priv->lvds_ssc_freq == 100) ||
> +		    (I915_READ(PCH_LVDS) & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP)
> +			factor = 25;
> +	} else if (is_sdvo && is_tv)
> +		factor = 20;
> +
> +	if (clock->m < factor * clock->n)
> +		fp |= FP_CB_TUNE;
> +
> +	dpll = 0;
> +
> +	if (is_lvds)
> +		dpll |= DPLLB_MODE_LVDS;
> +	else
> +		dpll |= DPLLB_MODE_DAC_SERIAL;
> +	if (is_sdvo) {
> +		pixel_multiplier = intel_mode_get_pixel_multiplier(adjusted_mode);
> +		if (pixel_multiplier > 1) {
> +			dpll |= (pixel_multiplier - 1) << PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT;
> +		}
> +		dpll |= DPLL_DVO_HIGH_SPEED;
> +	}
> +	if (is_dp && !is_cpu_edp)
> +		dpll |= DPLL_DVO_HIGH_SPEED;
> +
> +	/* compute bitmask from p1 value */
> +	dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
> +	/* also FPA1 */
> +	dpll |= (1 << (clock->p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
> +
> +	switch (clock->p2) {
> +	case 5:
> +		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
> +		break;
> +	case 7:
> +		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
> +		break;
> +	case 10:
> +		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
> +		break;
> +	case 14:
> +		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
> +		break;
> +	}
> +
> +	if (is_sdvo && is_tv)
> +		dpll |= PLL_REF_INPUT_TVCLKINBC;
> +	else if (is_tv)
> +		/* XXX: just matching BIOS for now */
> +		/*	dpll |= PLL_REF_INPUT_TVCLKINBC; */
> +		dpll |= 3;
> +	else if (is_lvds && intel_panel_use_ssc(dev_priv) && num_connectors < 2)
> +		dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
> +	else
> +		dpll |= PLL_REF_INPUT_DREFCLK;
> +
> +	pll = intel_get_pch_pll(intel_crtc, dpll, fp);
> +	if (!pll)
> +		return false;
> +
> +	I915_WRITE(intel_crtc->pch_pll->pll_reg, dpll);
> +
> +	/* Wait for the clocks to stabilize. */
> +	POSTING_READ(intel_crtc->pch_pll->pll_reg);
> +	udelay(150);
> +
> +	/* The pixel multiplier can only be updated once the
> +	 * DPLL is enabled and the clocks are stable.
> +	 *
> +	 * So write it again.
> +	 */
> +	I915_WRITE(intel_crtc->pch_pll->pll_reg, dpll);
> +
> +	intel_crtc->lowfreq_avail = false;
> +	if (is_lvds && has_reduced_clock && i915_powersave) {
> +		I915_WRITE(intel_crtc->pch_pll->fp1_reg, fp2);
> +		intel_crtc->lowfreq_avail = true;
> +	} else {
> +		I915_WRITE(intel_crtc->pch_pll->fp1_reg, fp);
> +	}
> +
> +	return true;
> +}
> +
>  static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
>  				  struct drm_display_mode *mode,
>  				  struct drm_display_mode *adjusted_mode,
> @@ -4897,11 +5034,10 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
>  	int plane = intel_crtc->plane;
>  	int num_connectors = 0;
>  	intel_clock_t clock, reduced_clock;
> -	u32 dpll, fp = 0, fp2 = 0;
>  	bool ok, has_reduced_clock = false, is_sdvo = false;
>  	bool is_crt = false, is_lvds = false, is_tv = false, is_dp = false;
>  	struct intel_encoder *encoder;
> -	int ret, factor;
> +	int ret;
>  	unsigned int pipe_bpp;
>  	bool dither;
>  	bool is_cpu_edp = false, is_pch_edp = false;
> @@ -4961,90 +5097,25 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
>  	}
>  	intel_crtc->bpp = pipe_bpp;
>  
> -	fp = clock.n << 16 | clock.m1 << 8 | clock.m2;
> -	if (has_reduced_clock)
> -		fp2 = reduced_clock.n << 16 | reduced_clock.m1 << 8 |
> -			reduced_clock.m2;
> -
> -	/* Enable autotuning of the PLL clock (if permissible) */
> -	factor = 21;
> -	if (is_lvds) {
> -		if ((intel_panel_use_ssc(dev_priv) &&
> -		     dev_priv->lvds_ssc_freq == 100) ||
> -		    (I915_READ(PCH_LVDS) & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP)
> -			factor = 25;
> -	} else if (is_sdvo && is_tv)
> -		factor = 20;
> -
> -	if (clock.m < factor * clock.n)
> -		fp |= FP_CB_TUNE;
> -
> -	dpll = 0;
> -
> -	if (is_lvds)
> -		dpll |= DPLLB_MODE_LVDS;
> -	else
> -		dpll |= DPLLB_MODE_DAC_SERIAL;
> -	if (is_sdvo) {
> -		int pixel_multiplier = intel_mode_get_pixel_multiplier(adjusted_mode);
> -		if (pixel_multiplier > 1) {
> -			dpll |= (pixel_multiplier - 1) << PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT;
> -		}
> -		dpll |= DPLL_DVO_HIGH_SPEED;
> -	}
> -	if (is_dp && !is_cpu_edp)
> -		dpll |= DPLL_DVO_HIGH_SPEED;
> -
> -	/* compute bitmask from p1 value */
> -	dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
> -	/* also FPA1 */
> -	dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
> -
> -	switch (clock.p2) {
> -	case 5:
> -		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_5;
> -		break;
> -	case 7:
> -		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_7;
> -		break;
> -	case 10:
> -		dpll |= DPLL_DAC_SERIAL_P2_CLOCK_DIV_10;
> -		break;
> -	case 14:
> -		dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
> -		break;
> -	}
> -
> -	if (is_sdvo && is_tv)
> -		dpll |= PLL_REF_INPUT_TVCLKINBC;
> -	else if (is_tv)
> -		/* XXX: just matching BIOS for now */
> -		/*	dpll |= PLL_REF_INPUT_TVCLKINBC; */
> -		dpll |= 3;
> -	else if (is_lvds && intel_panel_use_ssc(dev_priv) && num_connectors < 2)
> -		dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
> -	else
> -		dpll |= PLL_REF_INPUT_DREFCLK;
> -
>  	DRM_DEBUG_KMS("Mode for pipe %d:\n", pipe);
>  	drm_mode_debug_printmodeline(mode);
>  
> -	/* CPU eDP is the only output that doesn't need a PCH PLL of its own on
> -	 * pre-Haswell/LPT generation */
> -	if (HAS_PCH_LPT(dev)) {
> -		DRM_DEBUG_KMS("LPT detected: no PLL for pipe %d necessary\n",
> -				pipe);
> -	} else if (!is_cpu_edp) {
> -		struct intel_pch_pll *pll;
> -
> -		pll = intel_get_pch_pll(intel_crtc, dpll, fp);
> -		if (pll == NULL) {
> -			DRM_DEBUG_DRIVER("failed to find PLL for pipe %d\n",
> -					 pipe);
> -			return -EINVAL;
> +	if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)) {

Since the plan is to move all the hsw_crtc_stuff out into it's own
function I'd prefer a !HAS_PCH_LPT check here.

> +		/* CPU eDP is the only output that doesn't need a PCH PLL of its
> +		 * own */
> +		if (is_cpu_edp) {
> +			intel_put_pch_pll(intel_crtc);
> +		} else {
> +			ok = ironlake_pch_pll_set(crtc, adjusted_mode, &clock,
> +						  has_reduced_clock,
> +						  &reduced_clock);
> +			if (!ok) {
> +				DRM_ERROR("Failed to find PLL for pipe %d\n",
> +					  pipe);
> +				return -EINVAL;
> +			}
>  		}
> -	} else
> -		intel_put_pch_pll(intel_crtc);
> +	}
>  
>  	/* The LVDS pin pair needs to be on before the DPLLs are enabled.
>  	 * This is an exception to the general rule that mode_set doesn't turn
> @@ -5055,31 +5126,6 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
>  
>  	ironlake_set_m_n(crtc, mode, adjusted_mode);
>  
> -	if (intel_crtc->pch_pll) {
> -		I915_WRITE(intel_crtc->pch_pll->pll_reg, dpll);
> -
> -		/* Wait for the clocks to stabilize. */
> -		POSTING_READ(intel_crtc->pch_pll->pll_reg);
> -		udelay(150);
> -
> -		/* The pixel multiplier can only be updated once the
> -		 * DPLL is enabled and the clocks are stable.
> -		 *
> -		 * So write it again.
> -		 */
> -		I915_WRITE(intel_crtc->pch_pll->pll_reg, dpll);
> -	}
> -
> -	intel_crtc->lowfreq_avail = false;
> -	if (intel_crtc->pch_pll) {
> -		if (is_lvds && has_reduced_clock && i915_powersave) {
> -			I915_WRITE(intel_crtc->pch_pll->fp1_reg, fp2);
> -			intel_crtc->lowfreq_avail = true;
> -		} else {
> -			I915_WRITE(intel_crtc->pch_pll->fp1_reg, fp);
> -		}
> -	}
> -

Again, you're moving registers around - see the comment about that the
lvds pin pairs need to be enabled _before_ we fire up the pll. Yeah, this
is a mess and I think we should move the actual pll enabling to the
crtc_enable stage (and the also move the lvds pin pair/port enabling in
there). So
- the actuall pll enabling needs to stay here.
- maybe call the function update_pch_pll instead of set_pch_pll. This is
  more in line with Jesse's similar refactoring of i9xx_crtc_mode_set,
  where he called the split-out pll functions update_pll, too.

Cheers, Daniel
>  	ironlake_set_pipe_timings(intel_crtc, mode, adjusted_mode);
>  
>  	if (is_cpu_edp)
> -- 
> 1.7.10.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

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


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