[Intel-gfx] [PATCH] drm/i915: Disable FDI after the CRT port on LPT-H

ville.syrjala at linux.intel.com ville.syrjala at linux.intel.com
Tue Dec 8 06:05:48 PST 2015

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Bspec modeset sequence tells us to disable the PCH transcoder and
FDI after the CRT port on LPT-H, so let's do that. And the CRT port
should be disabled after the pipe, as we do on other PCH platforms
too since
commit 1ea56e269e13 ("drm/i915: Disable CRT port after pipe on PCH platforms")

commit 00490c22b1b5 ("drm/i915: Consider SPLL as another shared pll, v2.")
moved the SPLL disable from the .post_disable() hook to some upper
level code, so we can just move the CRT port disabling into the
.post_disable() hook. If we still had the non-shared SPLL, it would have
needed to be moved into the .post_pll_disable() hook.

v2: Actually move the CRT port disable to the .post_disable() hook,
    and amend the commit message with more details (Paulo)
v3: Fix typos in commit message (Paulo)

Cc: Paulo Zanoni <przanoni at gmail.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
 drivers/gpu/drm/i915/intel_crt.c     |  2 +-
 drivers/gpu/drm/i915/intel_display.c | 11 +++++------
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 12008af797bd..cef359958c73 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -844,7 +844,7 @@ void intel_crt_init(struct drm_device *dev)
 	crt->adpa_reg = adpa_reg;
 	crt->base.compute_config = intel_crt_compute_config;
-	if (HAS_PCH_SPLIT(dev) && !HAS_DDI(dev)) {
+	if (HAS_PCH_SPLIT(dev)) {
 		crt->base.disable = pch_disable_crt;
 		crt->base.post_disable = pch_post_disable_crt;
 	} else {
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 7e3afcc62997..429c3df99e48 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5164,18 +5164,17 @@ static void haswell_crtc_disable(struct drm_crtc *crtc)
 	if (!intel_crtc->config->has_dsi_encoder)
-	if (intel_crtc->config->has_pch_encoder) {
-		lpt_disable_pch_transcoder(dev_priv);
-		intel_ddi_fdi_disable(crtc);
-	}
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		if (encoder->post_disable)
-	if (intel_crtc->config->has_pch_encoder)
+	if (intel_crtc->config->has_pch_encoder) {
+		lpt_disable_pch_transcoder(dev_priv);
+		intel_ddi_fdi_disable(crtc);
 		intel_set_pch_fifo_underrun_reporting(dev_priv, TRANSCODER_A,
+	}

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