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Subject: Re: [PATCH 4.9 088/138] Revert "drm/i915: Do not rely on wm
 preservation for ILK watermarks"
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org
Cc:     stable@vger.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= <ville.syrjala@linux.intel.com>,
        Matt Roper <matthew.d.roper@intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Jani Nikula <jani.nikula@linux.intel.com>
References: <20171128100544.706504901@linuxfoundation.org>
 <20171128100551.657694618@linuxfoundation.org>
From:   Rainer Fiebig <jrf@mailbox.org>
Message-ID: <8801c618-eab6-4300-77c9-890182f0bdc4@mailbox.org>
Date:   Tue, 28 Nov 2017 11:45:41 +0100
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Greg Kroah-Hartman wrote:
> 4.9-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> This reverts commit 7de694782cbe7840f2c0de6f1e70f41fc1b8b6e8 which is
> commit 8777b927b92cf5b6c29f9f9d3c737addea9ac8a7 upstream.
> 
> It was reported to cause flickering and other regressions.
> 
> Reported-by: Rainer Fiebig <jrf@mailbox.org>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Matt Roper <matthew.d.roper@intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> reverted:
> ---
>  drivers/gpu/drm/i915/intel_drv.h |    1 
>  drivers/gpu/drm/i915/intel_pm.c  |   52 ++++++++++++++++++++++-----------------
>  2 files changed, 31 insertions(+), 22 deletions(-)
> 
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -457,6 +457,7 @@ struct intel_crtc_scaler_state {
>  
>  struct intel_pipe_wm {
>  	struct intel_wm_level wm[5];
> +	struct intel_wm_level raw_wm[5];
>  	uint32_t linetime;
>  	bool fbc_wm_enabled;
>  	bool pipe_enabled;
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -27,7 +27,6 @@
>  
>  #include <linux/cpufreq.h>
>  #include <drm/drm_plane_helper.h>
> -#include <drm/drm_atomic_helper.h>
>  #include "i915_drv.h"
>  #include "intel_drv.h"
>  #include "../../../platform/x86/intel_ips.h"
> @@ -2018,9 +2017,9 @@ static void ilk_compute_wm_level(const s
>  				 const struct intel_crtc *intel_crtc,
>  				 int level,
>  				 struct intel_crtc_state *cstate,
> -				 const struct intel_plane_state *pristate,
> -				 const struct intel_plane_state *sprstate,
> -				 const struct intel_plane_state *curstate,
> +				 struct intel_plane_state *pristate,
> +				 struct intel_plane_state *sprstate,
> +				 struct intel_plane_state *curstate,
>  				 struct intel_wm_level *result)
>  {
>  	uint16_t pri_latency = dev_priv->wm.pri_latency[level];
> @@ -2342,24 +2341,28 @@ static int ilk_compute_pipe_wm(struct in
>  	struct intel_pipe_wm *pipe_wm;
>  	struct drm_device *dev = state->dev;
>  	const struct drm_i915_private *dev_priv = to_i915(dev);
> -	struct drm_plane *plane;
> -	const struct drm_plane_state *plane_state;
> -	const struct intel_plane_state *pristate = NULL;
> -	const struct intel_plane_state *sprstate = NULL;
> -	const struct intel_plane_state *curstate = NULL;
> +	struct intel_plane *intel_plane;
> +	struct intel_plane_state *pristate = NULL;
> +	struct intel_plane_state *sprstate = NULL;
> +	struct intel_plane_state *curstate = NULL;
>  	int level, max_level = ilk_wm_max_level(dev), usable_level;
>  	struct ilk_wm_maximums max;
>  
>  	pipe_wm = &cstate->wm.ilk.optimal;
>  
> -	drm_atomic_crtc_state_for_each_plane_state(plane, plane_state, &cstate->base) {
> -		const struct intel_plane_state *ps = to_intel_plane_state(plane_state);
> +	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
> +		struct intel_plane_state *ps;
>  
> -		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
> +		ps = intel_atomic_get_existing_plane_state(state,
> +							   intel_plane);
> +		if (!ps)
> +			continue;
> +
> +		if (intel_plane->base.type == DRM_PLANE_TYPE_PRIMARY)
>  			pristate = ps;
> -		else if (plane->type == DRM_PLANE_TYPE_OVERLAY)
> +		else if (intel_plane->base.type == DRM_PLANE_TYPE_OVERLAY)
>  			sprstate = ps;
> -		else if (plane->type == DRM_PLANE_TYPE_CURSOR)
> +		else if (intel_plane->base.type == DRM_PLANE_TYPE_CURSOR)
>  			curstate = ps;
>  	}
>  
> @@ -2381,9 +2384,11 @@ static int ilk_compute_pipe_wm(struct in
>  	if (pipe_wm->sprites_scaled)
>  		usable_level = 0;
>  
> -	memset(&pipe_wm->wm, 0, sizeof(pipe_wm->wm));
>  	ilk_compute_wm_level(dev_priv, intel_crtc, 0, cstate,
> -			     pristate, sprstate, curstate, &pipe_wm->wm[0]);
> +			     pristate, sprstate, curstate, &pipe_wm->raw_wm[0]);
> +
> +	memset(&pipe_wm->wm, 0, sizeof(pipe_wm->wm));
> +	pipe_wm->wm[0] = pipe_wm->raw_wm[0];
>  
>  	if (IS_HASWELL(dev) || IS_BROADWELL(dev))
>  		pipe_wm->linetime = hsw_compute_linetime_wm(cstate);
> @@ -2393,8 +2398,8 @@ static int ilk_compute_pipe_wm(struct in
>  
>  	ilk_compute_wm_reg_maximums(dev, 1, &max);
>  
> -	for (level = 1; level <= usable_level; level++) {
> -		struct intel_wm_level *wm = &pipe_wm->wm[level];
> +	for (level = 1; level <= max_level; level++) {
> +		struct intel_wm_level *wm = &pipe_wm->raw_wm[level];
>  
>  		ilk_compute_wm_level(dev_priv, intel_crtc, level, cstate,
>  				     pristate, sprstate, curstate, wm);
> @@ -2404,10 +2409,13 @@ static int ilk_compute_pipe_wm(struct in
>  		 * register maximums since such watermarks are
>  		 * always invalid.
>  		 */
> -		if (!ilk_validate_wm_level(level, &max, wm)) {
> -			memset(wm, 0, sizeof(*wm));
> -			break;
> -		}
> +		if (level > usable_level)
> +			continue;
> +
> +		if (ilk_validate_wm_level(level, &max, wm))
> +			pipe_wm->wm[level] = *wm;
> +		else
> +			usable_level = level;
>  	}
>  
>  	return 0;
> 
> 

Applied it to 4.9.65 and all's nice again.
Thanks.

Rainer Fiebig

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