Re: [PATCH 6/9] drm/i915: Add eDP support for Valleyview

From: Daniel Vetter <daniel@ffwll.ch>
To: Vijay Purushothaman <vijay.a.purushothaman@intel.com>
Cc: Intel Graphics <intel-gfx@lists.freedesktop.org>
Subject: Re: [PATCH 6/9] drm/i915: Add eDP support for Valleyview
Date: Wed, 26 Sep 2012 16:31:46 +0200	[thread overview]
Message-ID: <20120926143146.GJ1980@bremse> (raw)
In-Reply-To: <1348666658-31345-7-git-send-email-vijay.a.purushothaman@intel.com>

On Wed, Sep 26, 2012 at 07:07:35PM +0530, Vijay Purushothaman wrote:
> Eventhough Valleyview display block is derived from Cantiga, VLV
> supports eDP. So, added eDP checks in i9xx_crtc_mode_set path.
> 
> v2: use different DPIO_DIVISOR values for VGA, DP and eDP
> v3: fix DPIO value calculation to use same values for all display
> 	interfaces
> 
> Signed-off-by: Gajanan Bhat <gajanan.bhat@intel.com>
> Signed-off-by: Vijay Purushothaman <vijay.a.purushothaman@intel.com>
> Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c |    6 ++++++
>  drivers/gpu/drm/i915/intel_dp.c      |   13 ++++++++-----
>  2 files changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index a8a81d1..aee6151 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -4405,6 +4405,12 @@ static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
>  		}
>  	}
>  
> +	if (IS_VALLEYVIEW(dev) && intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP)) {
> +		pipeconf |= PIPECONF_BPP_6 |
> +			PIPECONF_ENABLE |
> +			I965_PIPECONF_ACTIVE;
> +	}

No.

Jani Nikula and me just figured out that we have a giant mess with 6bpc
dithering on DP outputs, but unconditionally enabling 6bpc on vlv eDP only
papers over issues.

> +
>  	DRM_DEBUG_KMS("Mode for pipe %c:\n", pipe == 0 ? 'A' : 'B');
>  	drm_mode_debug_printmodeline(mode);
>  
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index c111c3f..af57027 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -885,7 +885,7 @@ intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
>  
>  	/* Split out the IBX/CPU vs CPT settings */
>  
> -	if (is_cpu_edp(intel_dp) && IS_GEN7(dev)) {
> +	if (is_cpu_edp(intel_dp) && IS_GEN7(dev) && !IS_VALLEYVIEW(dev)) {
>  		if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
>  			intel_dp->DP |= DP_SYNC_HS_HIGH;
>  		if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
> @@ -1474,7 +1474,7 @@ intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing)
>  {
>  	struct drm_device *dev = intel_dp->base.base.dev;
>  
> -	if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) {
> +	if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
>  		switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
>  		case DP_TRAIN_VOLTAGE_SWING_400:
>  			return DP_TRAIN_PRE_EMPHASIS_6;
> @@ -1773,7 +1773,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
>  		uint32_t    signal_levels;
>  
>  
> -		if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) {
> +		if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
>  			signal_levels = intel_gen7_edp_signal_levels(intel_dp->train_set[0]);
>  			DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_IVB) | signal_levels;
>  		} else if (IS_GEN6(dev) && is_cpu_edp(intel_dp)) {
> @@ -1859,7 +1859,7 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp)
>  			break;
>  		}
>  
> -		if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) {
> +		if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
>  			signal_levels = intel_gen7_edp_signal_levels(intel_dp->train_set[0]);
>  			DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_IVB) | signal_levels;
>  		} else if (IS_GEN6(dev) && is_cpu_edp(intel_dp)) {
> @@ -2471,7 +2471,10 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
>  		if (intel_dpd_is_edp(dev))
>  			intel_dp->is_pch_edp = true;
>  
> -	if (output_reg == DP_A || is_pch_edp(intel_dp)) {
> +	if (IS_VALLEYVIEW(dev) && output_reg == DP_C) {
> +		type = DRM_MODE_CONNECTOR_eDP;
> +		intel_encoder->type = INTEL_OUTPUT_EDP;

You need to be a notch more careful, since since

commit cb0953d734348e8862d6d7edc666cfb3bf6d8fae
Author: Adam Jackson <ajax@redhat.com>
Date:   Fri Jul 16 14:46:29 2010 -0400

    drm/i915: Initialize LVDS and eDP outputs before anything else

We initialize built-in panels before external outputs. Hence you need to
adjust intel_setup_outputs for vlv eDP, too, so that the eDP output comes
first. A bit a mess, I know.

Cheers, Daniel

> +	} else if (output_reg == DP_A || is_pch_edp(intel_dp)) {
>  		type = DRM_MODE_CONNECTOR_eDP;
>  		intel_encoder->type = INTEL_OUTPUT_EDP;
>  	} else {
> -- 
> 1.7.9.5
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@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