drm/i915: track dp target_clock in pipe_config

We need it in the fdi m_n computation, which nicely kills almost
all ugly special cases in there.

It looks like we also need this to handle 12bpc hdmi correctly.

Eventually it might be better to switch things around and put the
target clock into adjusted_mode->clock and create a new pipe_config
parameter for the port link clock.

v2: Add a massive comment in the code to explain this mess.

v3: s/dp_target_clock/pixel_target_clock in anticipation of the hdmi
use-case.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 10 insertions, 23 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 21d8a20d992..3875a5cbac6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5415,25 +5415,9 @@ static void ironlake_fdi_set_m_n(struct drm_crtc *crtc)
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct drm_display_mode *adjusted_mode =
 		&intel_crtc->config.adjusted_mode;
-	struct drm_display_mode *mode = &intel_crtc->config.requested_mode;
-	struct intel_encoder *intel_encoder, *edp_encoder = NULL;
 	struct intel_link_m_n m_n = {0};
 	int target_clock, lane, link_bw;
-	bool is_dp = false, is_cpu_edp = false;
-
-	for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
-		switch (intel_encoder->type) {
-		case INTEL_OUTPUT_DISPLAYPORT:
-			is_dp = true;
-			break;
-		case INTEL_OUTPUT_EDP:
-			is_dp = true;
-			if (!intel_encoder_is_pch_edp(&intel_encoder->base))
-				is_cpu_edp = true;
-			edp_encoder = intel_encoder;
-			break;
-		}
-	}
+	uint32_t bps;
 
 	/* FDI is a binary signal running at ~2.7GHz, encoding
 	 * each output octet as 10 bits. The actual frequency
@@ -5444,11 +5428,8 @@ static void ironlake_fdi_set_m_n(struct drm_crtc *crtc)
 	 */
 	link_bw = intel_fdi_link_freq(dev) * MHz(100)/KHz(1)/10;
 
-	/* [e]DP over FDI requires target mode clock instead of link clock. */
-	if (edp_encoder)
-		target_clock = intel_edp_target_clock(edp_encoder, mode);
-	else if (is_dp)
-		target_clock = mode->clock;
+	if (intel_crtc->config.pixel_target_clock)
+		target_clock = intel_crtc->config.pixel_target_clock;
 	else
 		target_clock = adjusted_mode->clock;
 
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 70507081141..88a09e9fe58 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -762,6 +762,7 @@ found:
 	intel_dp->lane_count = lane_count;
 	adjusted_mode->clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
 	pipe_config->pipe_bpp = bpp;
+	pipe_config->pixel_target_clock = target_clock;
 
 	DRM_DEBUG_KMS("DP link bw %02x lane count %d clock %d bpp %d\n",
 		      intel_dp->link_bw, intel_dp->lane_count,
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 9a20607440e..1de525857f3 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -196,7 +196,12 @@ struct intel_crtc_config {
 	bool dither;
 	int pipe_bpp;
 	struct intel_link_m_n dp_m_n;
-
+	/**
+	 * This is currently used by DP and HDMI encoders since those can have a
+	 * target pixel clock != the port link clock (which is currently stored
+	 * in adjusted_mode->clock).
+	 */
+	int pixel_target_clock;
 	/* Used by SDVO (and if we ever fix it, HDMI). */
 	unsigned pixel_multiplier;
 };