[Intel-gfx] [PATCH] drm/i915: Kill sink_crc for good
Rodrigo Vivi
rodrigo.vivi at intel.com
Thu Jul 5 21:25:00 UTC 2018
On Thu, Jul 05, 2018 at 02:11:45PM -0700, Dhinakaran Pandiyan wrote:
> On Thursday, July 5, 2018 12:25:28 PM PDT Rodrigo Vivi wrote:
> > It was originally introduced following the VESA spec in order to validate
> > PSR.
> >
> > However we found so many issues around sink_crc that instead of helping PSR
> > development it only brought another layer of trouble to the table.
> >
> > So, sink_crc has been a black whole for us in question of time, effort and
> > hope.
> >
> > First of the problems is that HW statement is clear: "Do not attempt to use
> > aux communication with PSR enabled". So the main reason behind sink_crc is
> > already compromised.
> >
> > For a while we had hope on the aux-mutex could workaround this problem on
> > SKL+ platforms, but that mutex was not reliable, not tested,
> > and we shouldn't use according to HW engineers.
> >
> > Also, nor source, nor sink designed and implemented the sink_crc to be used
> > like we are trying to use here.
> >
> > Well, the sink side of things is also apparently not prepared for this
> > case. Each panel that we tried seemed to have a different behavior with same
> > code and same source.
> >
> > So, for all the time we lost on trying to ducktape all these different
> > issues I believe it is now time to move PSR to a more reliable validation.
> > Maybe not a perfect one as we dreamed for this sink_crc, but at least more
> > reliable.
> >
> Good riddance.
Bye bye sink_crc, we are not going to miss you! ;)
> Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Thanks for granting me this honor!
now let's wait for CI to blow-up...
than when we change psr test cases we come back here, trigger a retest and
once CI is happy with push.
>
> > Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> > Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> > Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > ---
> > drivers/gpu/drm/i915/i915_debugfs.c | 81 ------------------
> > drivers/gpu/drm/i915/intel_dp.c | 123 ----------------------------
> > drivers/gpu/drm/i915/intel_drv.h | 2 -
> > 3 files changed, 206 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> > b/drivers/gpu/drm/i915/i915_debugfs.c index f6142d78ede4..e8fa106a3655
> > 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -2761,86 +2761,6 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_edp_psr_debug_fops,
> > i915_edp_psr_debug_get, i915_edp_psr_debug_set,
> > "%llu\n");
> >
> > -static int i915_sink_crc(struct seq_file *m, void *data)
> > -{
> > - struct drm_i915_private *dev_priv = node_to_i915(m->private);
> > - struct drm_device *dev = &dev_priv->drm;
> > - struct intel_connector *connector;
> > - struct drm_connector_list_iter conn_iter;
> > - struct intel_dp *intel_dp = NULL;
> > - struct drm_modeset_acquire_ctx ctx;
> > - int ret;
> > - u8 crc[6];
> > -
> > - drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
> > -
> > - drm_connector_list_iter_begin(dev, &conn_iter);
> > -
> > - for_each_intel_connector_iter(connector, &conn_iter) {
> > - struct drm_crtc *crtc;
> > - struct drm_connector_state *state;
> > - struct intel_crtc_state *crtc_state;
> > -
> > - if (connector->base.connector_type != DRM_MODE_CONNECTOR_eDP)
> > - continue;
> > -
> > -retry:
> > - ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
> > - if (ret)
> > - goto err;
> > -
> > - state = connector->base.state;
> > - if (!state->best_encoder)
> > - continue;
> > -
> > - crtc = state->crtc;
> > - ret = drm_modeset_lock(&crtc->mutex, &ctx);
> > - if (ret)
> > - goto err;
> > -
> > - crtc_state = to_intel_crtc_state(crtc->state);
> > - if (!crtc_state->base.active)
> > - continue;
> > -
> > - /*
> > - * We need to wait for all crtc updates to complete, to make
> > - * sure any pending modesets and plane updates are completed.
> > - */
> > - if (crtc_state->base.commit) {
> > - ret =
> > wait_for_completion_interruptible(&crtc_state->base.commit->hw_done); -
> > - if (ret)
> > - goto err;
> > - }
> > -
> > - intel_dp = enc_to_intel_dp(state->best_encoder);
> > -
> > - ret = intel_dp_sink_crc(intel_dp, crtc_state, crc);
> > - if (ret)
> > - goto err;
> > -
> > - seq_printf(m, "%02x%02x%02x%02x%02x%02x\n",
> > - crc[0], crc[1], crc[2],
> > - crc[3], crc[4], crc[5]);
> > - goto out;
> > -
> > -err:
> > - if (ret == -EDEADLK) {
> > - ret = drm_modeset_backoff(&ctx);
> > - if (!ret)
> > - goto retry;
> > - }
> > - goto out;
> > - }
> > - ret = -ENODEV;
> > -out:
> > - drm_connector_list_iter_end(&conn_iter);
> > - drm_modeset_drop_locks(&ctx);
> > - drm_modeset_acquire_fini(&ctx);
> > -
> > - return ret;
> > -}
> > -
> > static int i915_energy_uJ(struct seq_file *m, void *data)
> > {
> > struct drm_i915_private *dev_priv = node_to_i915(m->private);
> > @@ -4784,7 +4704,6 @@ static const struct drm_info_list i915_debugfs_list[]
> > = { {"i915_ppgtt_info", i915_ppgtt_info, 0},
> > {"i915_llc", i915_llc, 0},
> > {"i915_edp_psr_status", i915_edp_psr_status, 0},
> > - {"i915_sink_crc_eDP1", i915_sink_crc, 0},
> > {"i915_energy_uJ", i915_energy_uJ, 0},
> > {"i915_runtime_pm_status", i915_runtime_pm_status, 0},
> > {"i915_power_domain_info", i915_power_domain_info, 0},
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> > b/drivers/gpu/drm/i915/intel_dp.c index 5be07e1d816d..efdd4b408d51 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -3905,129 +3905,6 @@ intel_dp_configure_mst(struct intel_dp *intel_dp)
> > intel_dp->is_mst);
> > }
> >
> > -static int intel_dp_sink_crc_stop(struct intel_dp *intel_dp,
> > - struct intel_crtc_state *crtc_state, bool disable_wa)
> > -{
> > - struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > - struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > - struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
> > - u8 buf;
> > - int ret = 0;
> > - int count = 0;
> > - int attempts = 10;
> > -
> > - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) {
> > - DRM_DEBUG_KMS("Sink CRC couldn't be stopped properly\n");
> > - ret = -EIO;
> > - goto out;
> > - }
> > -
> > - if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
> > - buf & ~DP_TEST_SINK_START) < 0) {
> > - DRM_DEBUG_KMS("Sink CRC couldn't be stopped properly\n");
> > - ret = -EIO;
> > - goto out;
> > - }
> > -
> > - do {
> > - intel_wait_for_vblank(dev_priv, intel_crtc->pipe);
> > -
> > - if (drm_dp_dpcd_readb(&intel_dp->aux,
> > - DP_TEST_SINK_MISC, &buf) < 0) {
> > - ret = -EIO;
> > - goto out;
> > - }
> > - count = buf & DP_TEST_COUNT_MASK;
> > - } while (--attempts && count);
> > -
> > - if (attempts == 0) {
> > - DRM_DEBUG_KMS("TIMEOUT: Sink CRC counter is not zeroed after
> calculation
> > is stopped\n"); - ret = -ETIMEDOUT;
> > - }
> > -
> > - out:
> > - if (disable_wa)
> > - hsw_enable_ips(crtc_state);
> > - return ret;
> > -}
> > -
> > -static int intel_dp_sink_crc_start(struct intel_dp *intel_dp,
> > - struct intel_crtc_state *crtc_state)
> > -{
> > - struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > - struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > - struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
> > - u8 buf;
> > - int ret;
> > -
> > - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0)
> > - return -EIO;
> > -
> > - if (!(buf & DP_TEST_CRC_SUPPORTED))
> > - return -ENOTTY;
> > -
> > - if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0)
> > - return -EIO;
> > -
> > - if (buf & DP_TEST_SINK_START) {
> > - ret = intel_dp_sink_crc_stop(intel_dp, crtc_state, false);
> > - if (ret)
> > - return ret;
> > - }
> > -
> > - hsw_disable_ips(crtc_state);
> > -
> > - if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
> > - buf | DP_TEST_SINK_START) < 0) {
> > - hsw_enable_ips(crtc_state);
> > - return -EIO;
> > - }
> > -
> > - intel_wait_for_vblank(dev_priv, intel_crtc->pipe);
> > - return 0;
> > -}
> > -
> > -int intel_dp_sink_crc(struct intel_dp *intel_dp, struct intel_crtc_state
> > *crtc_state, u8 *crc) -{
> > - struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > - struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > - struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->base.crtc);
> > - u8 buf;
> > - int count, ret;
> > - int attempts = 6;
> > -
> > - ret = intel_dp_sink_crc_start(intel_dp, crtc_state);
> > - if (ret)
> > - return ret;
> > -
> > - do {
> > - intel_wait_for_vblank(dev_priv, intel_crtc->pipe);
> > -
> > - if (drm_dp_dpcd_readb(&intel_dp->aux,
> > - DP_TEST_SINK_MISC, &buf) < 0) {
> > - ret = -EIO;
> > - goto stop;
> > - }
> > - count = buf & DP_TEST_COUNT_MASK;
> > -
> > - } while (--attempts && count == 0);
> > -
> > - if (attempts == 0) {
> > - DRM_ERROR("Panel is unable to calculate any CRC after 6 vblanks\n");
> > - ret = -ETIMEDOUT;
> > - goto stop;
> > - }
> > -
> > - if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) {
> > - ret = -EIO;
> > - goto stop;
> > - }
> > -
> > -stop:
> > - intel_dp_sink_crc_stop(intel_dp, crtc_state, true);
> > - return ret;
> > -}
> > -
> > static bool
> > intel_dp_get_sink_irq(struct intel_dp *intel_dp, u8 *sink_irq_vector)
> > {
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h
> > b/drivers/gpu/drm/i915/intel_drv.h index e09b42d91d1e..8e6ee2fe66e4 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -1665,8 +1665,6 @@ void intel_dp_sink_dpms(struct intel_dp *intel_dp, int
> > mode); void intel_dp_encoder_reset(struct drm_encoder *encoder);
> > void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder);
> > void intel_dp_encoder_destroy(struct drm_encoder *encoder);
> > -int intel_dp_sink_crc(struct intel_dp *intel_dp,
> > - struct intel_crtc_state *crtc_state, u8 *crc);
> > bool intel_dp_compute_config(struct intel_encoder *encoder,
> > struct intel_crtc_state *pipe_config,
> > struct drm_connector_state *conn_state);
>
>
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