drm/i915: move dp clock computations to encoder->compute_config

With the exception of hsw, which has dedicated DP clocks which run at
the fixed frequency already, and vlv, which doesn't have optmized
pre-defined dp clock parameters (yet).

v2: Ville asked me to elaborate a bit more on the longer-term goals
wrt dpll settings computation:

So ultimately my idea is that in the compute config stage first the crtc
code puts the default platform pll limits into the pipe_config. Then
encoders can either overwrite that limit structure with their own special
stuff (mostly for lvds madness). Or they can pick some or all of the
parameters (e.g. just the p2 switchover on hdmi, or all the clock
parameters for dp/sdvo tv).

Once that's done then the generic crtc code can fill out any missing bits
(using the find_best_pll code) and then try to assign which pll to use (if
it's a platform with shared plls). In the end the modeset could should
simply write the computed stuff into registers and never be able to fail.

Of course there's still a lot of data to be moved into pipe_config to make
this all happen, hence some of the temporary ugliness.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> (v1)
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -101,15 +101,6 @@ intel_g4x_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
 			int target, int refclk, intel_clock_t *match_clock,
 			intel_clock_t *best_clock);
 
-static bool
-intel_find_pll_g4x_dp(const intel_limit_t *, struct drm_crtc *crtc,
-		      int target, int refclk, intel_clock_t *match_clock,
-		      intel_clock_t *best_clock);
-static bool
-intel_find_pll_ironlake_dp(const intel_limit_t *, struct drm_crtc *crtc,
-			   int target, int refclk, intel_clock_t *match_clock,
-			   intel_clock_t *best_clock);
-
 static bool
 intel_vlv_find_best_pll(const intel_limit_t *limit, struct drm_crtc *crtc,
 			int target, int refclk, intel_clock_t *match_clock,
@@ -242,20 +233,6 @@ static const intel_limit_t intel_limits_g4x_dual_channel_lvds = {
 	.find_pll = intel_g4x_find_best_PLL,
 };
 
-static const intel_limit_t intel_limits_g4x_display_port = {
-	.dot = { .min = 161670, .max = 227000 },
-	.vco = { .min = 1750000, .max = 3500000},
-	.n = { .min = 1, .max = 2 },
-	.m = { .min = 97, .max = 108 },
-	.m1 = { .min = 0x10, .max = 0x12 },
-	.m2 = { .min = 0x05, .max = 0x06 },
-	.p = { .min = 10, .max = 20 },
-	.p1 = { .min = 1, .max = 2},
-	.p2 = { .dot_limit = 0,
-		.p2_slow = 10, .p2_fast = 10 },
-	.find_pll = intel_find_pll_g4x_dp,
-};
-
 static const intel_limit_t intel_limits_pineview_sdvo = {
 	.dot = { .min = 20000, .max = 400000},
 	.vco = { .min = 1700000, .max = 3500000 },
@@ -362,20 +339,6 @@ static const intel_limit_t intel_limits_ironlake_dual_lvds_100m = {
 	.find_pll = intel_g4x_find_best_PLL,
 };
 
-static const intel_limit_t intel_limits_ironlake_display_port = {
-	.dot = { .min = 25000, .max = 350000 },
-	.vco = { .min = 1760000, .max = 3510000},
-	.n = { .min = 1, .max = 2 },
-	.m = { .min = 81, .max = 90 },
-	.m1 = { .min = 12, .max = 22 },
-	.m2 = { .min = 5, .max = 9 },
-	.p = { .min = 10, .max = 20 },
-	.p1 = { .min = 1, .max = 2},
-	.p2 = { .dot_limit = 0,
-		.p2_slow = 10, .p2_fast = 10 },
-	.find_pll = intel_find_pll_ironlake_dp,
-};
-
 static const intel_limit_t intel_limits_vlv_dac = {
 	.dot = { .min = 25000, .max = 270000 },
 	.vco = { .min = 4000000, .max = 6000000 },
@@ -473,10 +436,7 @@ static const intel_limit_t *intel_ironlake_limit(struct drm_crtc *crtc,
 			else
 				limit = &intel_limits_ironlake_single_lvds;
 		}
-	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT) ||
-		   intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP))
-		limit = &intel_limits_ironlake_display_port;
-	else
+	} else
 		limit = &intel_limits_ironlake_dac;
 
 	return limit;
@@ -497,8 +457,6 @@ static const intel_limit_t *intel_g4x_limit(struct drm_crtc *crtc)
 		limit = &intel_limits_g4x_hdmi;
 	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_SDVO)) {
 		limit = &intel_limits_g4x_sdvo;
-	} else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
-		limit = &intel_limits_g4x_display_port;
 	} else /* The option is for other outputs */
 		limit = &intel_limits_i9xx_sdvo;
 
@@ -745,59 +703,6 @@ intel_g4x_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
 	return found;
 }
 
-static bool
-intel_find_pll_ironlake_dp(const intel_limit_t *limit, struct drm_crtc *crtc,
-			   int target, int refclk, intel_clock_t *match_clock,
-			   intel_clock_t *best_clock)
-{
-	struct drm_device *dev = crtc->dev;
-	intel_clock_t clock;
-
-	if (target < 200000) {
-		clock.n = 1;
-		clock.p1 = 2;
-		clock.p2 = 10;
-		clock.m1 = 12;
-		clock.m2 = 9;
-	} else {
-		clock.n = 2;
-		clock.p1 = 1;
-		clock.p2 = 10;
-		clock.m1 = 14;
-		clock.m2 = 8;
-	}
-	intel_clock(dev, refclk, &clock);
-	memcpy(best_clock, &clock, sizeof(intel_clock_t));
-	return true;
-}
-
-/* DisplayPort has only two frequencies, 162MHz and 270MHz */
-static bool
-intel_find_pll_g4x_dp(const intel_limit_t *limit, struct drm_crtc *crtc,
-		      int target, int refclk, intel_clock_t *match_clock,
-		      intel_clock_t *best_clock)
-{
-	intel_clock_t clock;
-	if (target < 200000) {
-		clock.p1 = 2;
-		clock.p2 = 10;
-		clock.n = 2;
-		clock.m1 = 23;
-		clock.m2 = 8;
-	} else {
-		clock.p1 = 1;
-		clock.p2 = 10;
-		clock.n = 1;
-		clock.m1 = 14;
-		clock.m2 = 2;
-	}
-	clock.m = 5 * (clock.m1 + 2) + (clock.m2 + 2);
-	clock.p = (clock.p1 * clock.p2);
-	clock.dot = 96000 * clock.m / (clock.n + 2) / clock.p;
-	clock.vco = 0;
-	memcpy(best_clock, &clock, sizeof(intel_clock_t));
-	return true;
-}
 static bool
 intel_vlv_find_best_pll(const intel_limit_t *limit, struct drm_crtc *crtc,
 			int target, int refclk, intel_clock_t *match_clock,

drivers/gpu/drm/i915/intel_dp.c

@@ -660,6 +660,49 @@ intel_dp_i2c_init(struct intel_dp *intel_dp,
 	return ret;
 }
 
+static void
+intel_dp_set_clock(struct intel_encoder *encoder,
+		   struct intel_crtc_config *pipe_config, int link_bw)
+{
+	struct drm_device *dev = encoder->base.dev;
+
+	if (IS_G4X(dev)) {
+		if (link_bw == DP_LINK_BW_1_62) {
+			pipe_config->dpll.p1 = 2;
+			pipe_config->dpll.p2 = 10;
+			pipe_config->dpll.n = 2;
+			pipe_config->dpll.m1 = 23;
+			pipe_config->dpll.m2 = 8;
+		} else {
+			pipe_config->dpll.p1 = 1;
+			pipe_config->dpll.p2 = 10;
+			pipe_config->dpll.n = 1;
+			pipe_config->dpll.m1 = 14;
+			pipe_config->dpll.m2 = 2;
+		}
+		pipe_config->clock_set = true;
+	} else if (IS_HASWELL(dev)) {
+		/* Haswell has special-purpose DP DDI clocks. */
+	} else if (HAS_PCH_SPLIT(dev)) {
+		if (link_bw == DP_LINK_BW_1_62) {
+			pipe_config->dpll.n = 1;
+			pipe_config->dpll.p1 = 2;
+			pipe_config->dpll.p2 = 10;
+			pipe_config->dpll.m1 = 12;
+			pipe_config->dpll.m2 = 9;
+		} else {
+			pipe_config->dpll.n = 2;
+			pipe_config->dpll.p1 = 1;
+			pipe_config->dpll.p2 = 10;
+			pipe_config->dpll.m1 = 14;
+			pipe_config->dpll.m2 = 8;
+		}
+		pipe_config->clock_set = true;
+	} else if (IS_VALLEYVIEW(dev)) {
+		/* FIXME: Need to figure out optimized DP clocks for vlv. */
+	}
+}
+
 bool
 intel_dp_compute_config(struct intel_encoder *encoder,
 			struct intel_crtc_config *pipe_config)
@@ -765,6 +808,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	}
 	pipe_config->pipe_bpp = bpp;
 
+	intel_dp_set_clock(encoder, pipe_config, intel_dp->link_bw);
+
 	return true;
 }