drm/i915: Make adjusted_mode.clock non-pixel multiplied

It would be easier if adjusted_mode.clock would be the pipe pixel clock,
and it actually is, except for the cases where pixel_multiplier > 1.

So let's change intel_sdvo to use port_clock as the multiplied clock,
and then we can leave adjusted_mode.clock as pipe pixel clock.

v2: Improve port_clock documentation
    Rebased on top of SDVO pixel_multiplier fixes
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NJani Nikula <jani.nikula@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -4061,7 +4061,6 @@ static int ironlake_fdi_compute_config(struct intel_crtc *intel_crtc,
 	link_bw = intel_fdi_link_freq(dev) * MHz(100)/KHz(1)/10;
 
 	fdi_dotclock = adjusted_mode->clock;
-	fdi_dotclock /= pipe_config->pixel_multiplier;
 
 	lane = ironlake_get_lanes_required(fdi_dotclock, link_bw,
 					   pipe_config->pipe_bpp);
@@ -7370,8 +7369,7 @@ static void ironlake_crtc_clock_get(struct intel_crtc *crtc,
 	clock = ((u64)link_m * (u64)link_freq);
 	do_div(clock, link_n);
 
-	pipe_config->adjusted_mode.clock = clock *
-		pipe_config->pixel_multiplier;
+	pipe_config->adjusted_mode.clock = clock;
 }
 
 /** Returns the currently programmed mode of the given pipe. */
@@ -8316,7 +8314,8 @@ intel_modeset_pipe_config(struct drm_crtc *crtc,
 	/* Set default port clock if not overwritten by the encoder. Needs to be
 	 * done afterwards in case the encoder adjusts the mode. */
 	if (!pipe_config->port_clock)
-		pipe_config->port_clock = pipe_config->adjusted_mode.clock;
+		pipe_config->port_clock = pipe_config->adjusted_mode.clock *
+			pipe_config->pixel_multiplier;
 
 	ret = intel_crtc_compute_config(to_intel_crtc(crtc), pipe_config);
 	if (ret < 0) {

drivers/gpu/drm/i915/intel_drv.h

@@ -212,6 +212,8 @@ struct intel_crtc_config {
 	unsigned long quirks;
 
 	struct drm_display_mode requested_mode;
+	/* Actual pipe timings ie. what we program into the pipe timing
+	 * registers. adjusted_mode.clock is the pipe pixel clock. */
 	struct drm_display_mode adjusted_mode;
 	/* Whether to set up the PCH/FDI. Note that we never allow sharing
 	 * between pch encoders and cpu encoders. */
@@ -266,7 +268,8 @@ struct intel_crtc_config {
 
 	/*
 	 * Frequence the dpll for the port should run at. Differs from the
-	 * adjusted dotclock e.g. for DP or 12bpc hdmi mode.
+	 * adjusted dotclock e.g. for DP or 12bpc hdmi mode. This is also
+	 * already multiplied by pixel_multiplier.
 	 */
 	int port_clock;
 

drivers/gpu/drm/i915/intel_sdvo.c

@@ -1059,7 +1059,7 @@ intel_sdvo_get_preferred_input_mode(struct intel_sdvo *intel_sdvo,
 
 static void i9xx_adjust_sdvo_tv_clock(struct intel_crtc_config *pipe_config)
 {
-	unsigned dotclock = pipe_config->adjusted_mode.clock;
+	unsigned dotclock = pipe_config->port_clock;
 	struct dpll *clock = &pipe_config->dpll;
 
 	/* SDVO TV has fixed PLL values depend on its clock range,
@@ -1124,7 +1124,6 @@ static bool intel_sdvo_compute_config(struct intel_encoder *encoder,
 	 */
 	pipe_config->pixel_multiplier =
 		intel_sdvo_get_pixel_multiplier(adjusted_mode);
-	adjusted_mode->clock *= pipe_config->pixel_multiplier;
 
 	if (intel_sdvo->color_range_auto) {
 		/* See CEA-861-E - 5.1 Default Encoding Parameters */
@@ -1209,7 +1208,6 @@ static void intel_sdvo_mode_set(struct intel_encoder *intel_encoder)
 		return;
 
 	intel_sdvo_get_dtd_from_mode(&input_dtd, adjusted_mode);
-	input_dtd.part1.clock /= crtc->config.pixel_multiplier;
 
 	if (intel_sdvo->is_tv || intel_sdvo->is_lvds)
 		input_dtd.part2.sdvo_flags = intel_sdvo->dtd_sdvo_flags;