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authorVille Syrjälä <ville.syrjala@linux.intel.com>2018-06-13 19:05:53 +0300
committerJani Nikula <jani.nikula@intel.com>2018-06-19 15:48:06 +0300
commit4dccc4d517481282e84335c7acbfd7a1481004b8 (patch)
tree77fcddb345a6a41934b8e481ee23a234bfb9f9e1
parent1e34f1d36804be1a446212a33ca5397bf0e5acdd (diff)
downloadop-kernel-dev-4dccc4d517481282e84335c7acbfd7a1481004b8.zip
op-kernel-dev-4dccc4d517481282e84335c7acbfd7a1481004b8.tar.gz
drm/i915: Turn off g4x DP port in .post_disable()
While Bspec doesn't list a specific sequence for turning off the DP port on g4x we are getting an underrun if the port is disabled in the .disable() hook. Looks like the pipe stops when the port stops, and by that time the plane disable may not have completed yet. Also the plane(s) seem to end up in some wonky state when this happens as they also signal another underrun immediately after we turn them back on during the next enable sequence. We could add a vblank wait in .disable() to avoid wedging the planes, but I assume we're still tripping up the pipe in some way. So it seems better to me to just follow the ILK+ sequence and turn off the DP port in .post_disable() instead. This sequence doesn't seem to suffer from this problem. Could be it was always the intended sequence for DP and the gen4 bspec was just never updated to include it. Originally we used the bad sequence even on ilk+, but I changed that in commit 08aff3fe26ae ("drm/i915: Move DP port disable to post_disable for pch platforms") as it was causing issues on those platforms as well. I left out g4x then only because I didn't have the hardware to test it. Now that I do it's fairly clear that the ilk+ sequence is also the right choice for g4x. v2: Fix whitespace fail (Jani) Mention the ilk+ commit (Jani) Cc: stable@vger.kernel.org Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180613160553.11664-2-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula <jani.nikula@intel.com> (cherry picked from commit 51a9f6dfc00d35f927ecfaf6f0ae8ebaba39b3fe) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
-rw-r--r--drivers/gpu/drm/i915/intel_dp.c24
1 files changed, 8 insertions, 16 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2bdfe4b..16faea3 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2790,16 +2790,6 @@ static void g4x_disable_dp(struct intel_encoder *encoder,
const struct drm_connector_state *old_conn_state)
{
intel_disable_dp(encoder, old_crtc_state, old_conn_state);
-
- /* disable the port before the pipe on g4x */
- intel_dp_link_down(encoder, old_crtc_state);
-}
-
-static void ilk_disable_dp(struct intel_encoder *encoder,
- const struct intel_crtc_state *old_crtc_state,
- const struct drm_connector_state *old_conn_state)
-{
- intel_disable_dp(encoder, old_crtc_state, old_conn_state);
}
static void vlv_disable_dp(struct intel_encoder *encoder,
@@ -2813,13 +2803,19 @@ static void vlv_disable_dp(struct intel_encoder *encoder,
intel_disable_dp(encoder, old_crtc_state, old_conn_state);
}
-static void ilk_post_disable_dp(struct intel_encoder *encoder,
+static void g4x_post_disable_dp(struct intel_encoder *encoder,
const struct intel_crtc_state *old_crtc_state,
const struct drm_connector_state *old_conn_state)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
enum port port = encoder->port;
+ /*
+ * Bspec does not list a specific disable sequence for g4x DP.
+ * Follow the ilk+ sequence (disable pipe before the port) for
+ * g4x DP as it does not suffer from underruns like the normal
+ * g4x modeset sequence (disable pipe after the port).
+ */
intel_dp_link_down(encoder, old_crtc_state);
/* Only ilk+ has port A */
@@ -6442,15 +6438,11 @@ bool intel_dp_init(struct drm_i915_private *dev_priv,
intel_encoder->enable = vlv_enable_dp;
intel_encoder->disable = vlv_disable_dp;
intel_encoder->post_disable = vlv_post_disable_dp;
- } else if (INTEL_GEN(dev_priv) >= 5) {
- intel_encoder->pre_enable = g4x_pre_enable_dp;
- intel_encoder->enable = g4x_enable_dp;
- intel_encoder->disable = ilk_disable_dp;
- intel_encoder->post_disable = ilk_post_disable_dp;
} else {
intel_encoder->pre_enable = g4x_pre_enable_dp;
intel_encoder->enable = g4x_enable_dp;
intel_encoder->disable = g4x_disable_dp;
+ intel_encoder->post_disable = g4x_post_disable_dp;
}
intel_dig_port->dp.output_reg = output_reg;
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