On Thu, Apr 25, 2019 at 07:29:05PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> On HSW the pipe A panel fitter lives inside the display power well,
> and the input MUX for the EDP transcoder needs to be configured
> appropriately to route the data through the power well as needed.
> Changing the MUX setting is not allowed while the pipe is active,
> so we need to force a full modeset whenever we need to change it.
>
> Currently we may end up doing a fastset which won't change the
> MUX settings, but it will drop the power well reference, and that
> kills the pipe.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Fixes: d19f958db23c ("drm/i915: Enable fastset for non-boot modesets.")
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Probably
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104838
and maybe
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108672
> ---
> drivers/gpu/drm/i915/intel_display.c | 9 +++++++++
> drivers/gpu/drm/i915/intel_pipe_crc.c | 13 ++++++++++---
> 2 files changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index c67f165b466c..691c9a929164 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -12133,6 +12133,7 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
> struct intel_crtc_state *pipe_config,
> bool adjust)
> {
> + struct intel_crtc *crtc = to_intel_crtc(current_config->base.crtc);
> bool ret = true;
> bool fixup_inherited = adjust &&
> (current_config->base.mode.private_flags & I915_MODE_FLAG_INHERITED) &&
> @@ -12354,6 +12355,14 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
> PIPE_CONF_CHECK_X(gmch_pfit.pgm_ratios);
> PIPE_CONF_CHECK_X(gmch_pfit.lvds_border_bits);
>
> + /*
> + * Changing the EDP transcoder input mux
> + * (A_ONOFF vs. A_ON) requires a full modeset.
> + */
> + if (IS_HASWELL(dev_priv) && crtc->pipe == PIPE_A &&
> + current_config->cpu_transcoder == TRANSCODER_EDP)
> + PIPE_CONF_CHECK_BOOL(pch_pfit.enabled);
> +
> if (!adjust) {
> PIPE_CONF_CHECK_I(pipe_src_w);
> PIPE_CONF_CHECK_I(pipe_src_h);
> diff --git a/drivers/gpu/drm/i915/intel_pipe_crc.c b/drivers/gpu/drm/i915/intel_pipe_crc.c
> index e94b5b1bc1b7..e7c7be4911c1 100644
> --- a/drivers/gpu/drm/i915/intel_pipe_crc.c
> +++ b/drivers/gpu/drm/i915/intel_pipe_crc.c
> @@ -311,10 +311,17 @@ intel_crtc_crc_setup_workarounds(struct intel_crtc *crtc, bool enable)
> pipe_config->base.mode_changed = pipe_config->has_psr;
> pipe_config->crc_enabled = enable;
>
> - if (IS_HASWELL(dev_priv) && crtc->pipe == PIPE_A) {
> + if (IS_HASWELL(dev_priv) &&
> + pipe_config->base.active && crtc->pipe == PIPE_A &&
> + pipe_config->cpu_transcoder == TRANSCODER_EDP) {
> + bool old_need_power_well = pipe_config->pch_pfit.enabled ||
> + pipe_config->pch_pfit.force_thru;
> + bool new_need_power_well = pipe_config->pch_pfit.enabled ||
> + enable;
> +
> pipe_config->pch_pfit.force_thru = enable;
> - if (pipe_config->cpu_transcoder == TRANSCODER_EDP &&
> - pipe_config->pch_pfit.enabled != enable)
> +
> + if (old_need_power_well != new_need_power_well)
> pipe_config->base.connectors_changed = true;
> }
>
> --
> 2.21.0
--
Ville Syrjälä
Intel
