[Intel-gfx] [PATCH 3/5] drm/i915: Enable fastset for non-boot modesets.

[Jani Nikula]

On Tue, 08 Jan 2019, Maarten Lankhorst <maarten.lankhorst at linux.intel.com> wrote:
> Now that our state comparison functions are pretty complete, we should
> enable fastset by default when a modeset can be avoided. Even if we're
> not completely certain about the inherited state, we can be certain
> after the first modeset that our sw state matches the hw state.
>
> There is one testcase explicitly testing fastset,
> kms_panel_fitting.atomic-fastset but other testcases do so indirectly
> because most tests don't clean up the display during exit, or otherwise
> indirectly preserve mode by doing igt_display_reset or inheriting during
> init.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Reviewed-by: Hans de Goede <hdegoede at redhat.com>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 696e6f5680df..f8cbdd50fa38 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11671,6 +11671,11 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
>  		(current_config->base.mode.private_flags & I915_MODE_FLAG_INHERITED) &&
>  		!(pipe_config->base.mode.private_flags & I915_MODE_FLAG_INHERITED);
>  
> +	if (fixup_inherited && !i915_modparams.fastboot) {
> +		drm_dbg(DRM_UT_KMS, "initial modeset and fastboot not set\n");

DRM_DEBUG_KMS() please.

> +		ret = false;
> +	}
> +
>  #define PIPE_CONF_CHECK_X(name) do { \
>  	if (current_config->name != pipe_config->name) { \
>  		pipe_config_err(adjust, __stringify(name), \
> @@ -12694,8 +12699,7 @@ static int intel_atomic_check(struct drm_device *dev,
>  			return ret;
>  		}
>  
> -		if (i915_modparams.fastboot &&
> -		    intel_pipe_config_compare(dev_priv,
> +		if (intel_pipe_config_compare(dev_priv,
>  					to_intel_crtc_state(old_crtc_state),
>  					pipe_config, true)) {
>  			crtc_state->mode_changed = false;

-- 
Jani Nikula, Intel Open Source Graphics Center