drm/i915: Remove struct dp_link_dpll

struct dp_link_dpll is a pointless wrapper around struct dpll.
Just store the desired link rate into struct dpll::dot and
we're done.

v2: Document the full divider as a proper decimal number on chv
    Nuke bogus eDP 1.4 comments for chv while at it
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220307233940.4161-9-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/g4x_dp.c

@@ -24,58 +24,37 @@
 #include "intel_pps.h"
 #include "vlv_sideband.h"
 
-struct dp_link_dpll {
-	int clock;
-	struct dpll dpll;
+static const struct dpll g4x_dpll[] = {
+	{ .dot = 162000, .p1 = 2, .p2 = 10, .n = 2, .m1 = 23, .m2 = 8, },
+	{ .dot = 270000, .p1 = 1, .p2 = 10, .n = 1, .m1 = 14, .m2 = 2, },
 };
 
-static const struct dp_link_dpll g4x_dpll[] = {
-	{ 162000,
-		{ .p1 = 2, .p2 = 10, .n = 2, .m1 = 23, .m2 = 8 } },
-	{ 270000,
-		{ .p1 = 1, .p2 = 10, .n = 1, .m1 = 14, .m2 = 2 } }
+static const struct dpll pch_dpll[] = {
+	{ .dot = 162000, .p1 = 2, .p2 = 10, .n = 1, .m1 = 12, .m2 = 9, },
+	{ .dot = 270000, .p1 = 1, .p2 = 10, .n = 2, .m1 = 14, .m2 = 8, },
 };
 
-static const struct dp_link_dpll pch_dpll[] = {
-	{ 162000,
-		{ .p1 = 2, .p2 = 10, .n = 1, .m1 = 12, .m2 = 9 } },
-	{ 270000,
-		{ .p1 = 1, .p2 = 10, .n = 2, .m1 = 14, .m2 = 8 } }
+static const struct dpll vlv_dpll[] = {
+	{ .dot = 162000, .p1 = 3, .p2 = 2, .n = 5, .m1 = 3, .m2 = 81, },
+	{ .dot = 270000, .p1 = 2, .p2 = 2, .n = 1, .m1 = 2, .m2 = 27, },
 };
 
-static const struct dp_link_dpll vlv_dpll[] = {
-	{ 162000,
-		{ .p1 = 3, .p2 = 2, .n = 5, .m1 = 3, .m2 = 81 } },
-	{ 270000,
-		{ .p1 = 2, .p2 = 2, .n = 1, .m1 = 2, .m2 = 27 } }
-};
-
-/*
- * CHV supports eDP 1.4 that have  more link rates.
- * Below only provides the fixed rate but exclude variable rate.
- */
-static const struct dp_link_dpll chv_dpll[] = {
-	/*
-	 * CHV requires to program fractional division for m2.
-	 * m2 is stored in fixed point format using formula below
-	 * (m2_int << 22) | m2_fraction
-	 */
-	{ 162000,	/* m2_int = 32, m2_fraction = 1677722 */
-		{ .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } },
-	{ 270000,	/* m2_int = 27, m2_fraction = 0 */
-		{ .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },
+static const struct dpll chv_dpll[] = {
+	/* m2 is .22 binary fixed point  */
+	{ .dot = 162000, .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a /* 32.4 */ },
+	{ .dot = 270000, .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 /* 27.0 */ },
 };
 
 const struct dpll *vlv_get_dpll(struct drm_i915_private *i915)
 {
-	return IS_CHERRYVIEW(i915) ? &chv_dpll[0].dpll : &vlv_dpll[0].dpll;
+	return IS_CHERRYVIEW(i915) ? &chv_dpll[0] : &vlv_dpll[0];
 }
 
 void g4x_dp_set_clock(struct intel_encoder *encoder,
 		      struct intel_crtc_state *pipe_config)
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
-	const struct dp_link_dpll *divisor = NULL;
+	const struct dpll *divisor = NULL;
 	int i, count = 0;
 
 	if (IS_G4X(dev_priv)) {
@@ -94,8 +73,8 @@ void g4x_dp_set_clock(struct intel_encoder *encoder,
 
 	if (divisor && count) {
 		for (i = 0; i < count; i++) {
-			if (pipe_config->port_clock == divisor[i].clock) {
-				pipe_config->dpll = divisor[i].dpll;
+			if (pipe_config->port_clock == divisor[i].dot) {
+				pipe_config->dpll = divisor[i];
 				pipe_config->clock_set = true;
 				break;
 			}