drm/i915: Rework DPLL calculation parameters for Ironlake

Got Ironlake DPLL parameter table, which reflects the hardware
optimized values. So this one trys to list DPLL parameters for
different output types, should potential fix clock issue seen
on new Arrandale CPUs.

This fixes DPLL setting failure on one 1920x1080 dual channel
LVDS for Ironlake. Test has also been made on LVDS panels with
smaller size and CRT/HDMI/DP ports for different monitors on
their all supported modes.

Update:
- Change name of double LVDS to dual LVDS.
- Fix SSC 120M reference clock to use the right range.

Cc: CSJ <changsijay@gmail.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 167 insertions, 50 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 12775df1bbfd..7e9c835f9ae0 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -240,33 +240,86 @@ struct intel_limit {
 #define IRONLAKE_DOT_MAX         350000
 #define IRONLAKE_VCO_MIN         1760000
 #define IRONLAKE_VCO_MAX         3510000
-#define IRONLAKE_N_MIN           1
-#define IRONLAKE_N_MAX           6
-#define IRONLAKE_M_MIN           79
-#define IRONLAKE_M_MAX           127
 #define IRONLAKE_M1_MIN          12
 #define IRONLAKE_M1_MAX          22
 #define IRONLAKE_M2_MIN          5
 #define IRONLAKE_M2_MAX          9
-#define IRONLAKE_P_SDVO_DAC_MIN  5
-#define IRONLAKE_P_SDVO_DAC_MAX  80
-#define IRONLAKE_P_LVDS_MIN      28
-#define IRONLAKE_P_LVDS_MAX      112
-#define IRONLAKE_P1_MIN          1
-#define IRONLAKE_P1_MAX          8
-#define IRONLAKE_P2_SDVO_DAC_SLOW 10
-#define IRONLAKE_P2_SDVO_DAC_FAST 5
-#define IRONLAKE_P2_LVDS_SLOW    14 /* single channel */
-#define IRONLAKE_P2_LVDS_FAST    7  /* double channel */
 #define IRONLAKE_P2_DOT_LIMIT    225000 /* 225Mhz */
 
-#define IRONLAKE_P_DISPLAY_PORT_MIN     10
-#define IRONLAKE_P_DISPLAY_PORT_MAX     20
-#define IRONLAKE_P2_DISPLAY_PORT_FAST   10
-#define IRONLAKE_P2_DISPLAY_PORT_SLOW   10
-#define IRONLAKE_P2_DISPLAY_PORT_LIMIT  0
-#define IRONLAKE_P1_DISPLAY_PORT_MIN    1
-#define IRONLAKE_P1_DISPLAY_PORT_MAX    2
+/* We have parameter ranges for different type of outputs. */
+
+/* DAC & HDMI Refclk 120Mhz */
+#define IRONLAKE_DAC_N_MIN      1
+#define IRONLAKE_DAC_N_MAX      5
+#define IRONLAKE_DAC_M_MIN      79
+#define IRONLAKE_DAC_M_MAX      127
+#define IRONLAKE_DAC_P_MIN      5
+#define IRONLAKE_DAC_P_MAX      80
+#define IRONLAKE_DAC_P1_MIN     1
+#define IRONLAKE_DAC_P1_MAX     8
+#define IRONLAKE_DAC_P2_SLOW    10
+#define IRONLAKE_DAC_P2_FAST    5
+
+/* LVDS single-channel 120Mhz refclk */
+#define IRONLAKE_LVDS_S_N_MIN   1
+#define IRONLAKE_LVDS_S_N_MAX   3
+#define IRONLAKE_LVDS_S_M_MIN   79
+#define IRONLAKE_LVDS_S_M_MAX   118
+#define IRONLAKE_LVDS_S_P_MIN   28
+#define IRONLAKE_LVDS_S_P_MAX   112
+#define IRONLAKE_LVDS_S_P1_MIN  2
+#define IRONLAKE_LVDS_S_P1_MAX  8
+#define IRONLAKE_LVDS_S_P2_SLOW 14
+#define IRONLAKE_LVDS_S_P2_FAST 14
+
+/* LVDS dual-channel 120Mhz refclk */
+#define IRONLAKE_LVDS_D_N_MIN   1
+#define IRONLAKE_LVDS_D_N_MAX   3
+#define IRONLAKE_LVDS_D_M_MIN   79
+#define IRONLAKE_LVDS_D_M_MAX   127
+#define IRONLAKE_LVDS_D_P_MIN   14
+#define IRONLAKE_LVDS_D_P_MAX   56
+#define IRONLAKE_LVDS_D_P1_MIN  2
+#define IRONLAKE_LVDS_D_P1_MAX  8
+#define IRONLAKE_LVDS_D_P2_SLOW 7
+#define IRONLAKE_LVDS_D_P2_FAST 7
+
+/* LVDS single-channel 100Mhz refclk */
+#define IRONLAKE_LVDS_S_SSC_N_MIN       1
+#define IRONLAKE_LVDS_S_SSC_N_MAX       2
+#define IRONLAKE_LVDS_S_SSC_M_MIN       79
+#define IRONLAKE_LVDS_S_SSC_M_MAX       126
+#define IRONLAKE_LVDS_S_SSC_P_MIN       28
+#define IRONLAKE_LVDS_S_SSC_P_MAX       112
+#define IRONLAKE_LVDS_S_SSC_P1_MIN      2
+#define IRONLAKE_LVDS_S_SSC_P1_MAX      8
+#define IRONLAKE_LVDS_S_SSC_P2_SLOW     14
+#define IRONLAKE_LVDS_S_SSC_P2_FAST     14
+
+/* LVDS dual-channel 100Mhz refclk */
+#define IRONLAKE_LVDS_D_SSC_N_MIN       1
+#define IRONLAKE_LVDS_D_SSC_N_MAX       3
+#define IRONLAKE_LVDS_D_SSC_M_MIN       79
+#define IRONLAKE_LVDS_D_SSC_M_MAX       126
+#define IRONLAKE_LVDS_D_SSC_P_MIN       14
+#define IRONLAKE_LVDS_D_SSC_P_MAX       42
+#define IRONLAKE_LVDS_D_SSC_P1_MIN      2
+#define IRONLAKE_LVDS_D_SSC_P1_MAX      6
+#define IRONLAKE_LVDS_D_SSC_P2_SLOW     7
+#define IRONLAKE_LVDS_D_SSC_P2_FAST     7
+
+/* DisplayPort */
+#define IRONLAKE_DP_N_MIN               1
+#define IRONLAKE_DP_N_MAX               2
+#define IRONLAKE_DP_M_MIN               81
+#define IRONLAKE_DP_M_MAX               90
+#define IRONLAKE_DP_P_MIN               10
+#define IRONLAKE_DP_P_MAX               20
+#define IRONLAKE_DP_P2_FAST             10
+#define IRONLAKE_DP_P2_SLOW             10
+#define IRONLAKE_DP_P2_LIMIT            0
+#define IRONLAKE_DP_P1_MIN              1
+#define IRONLAKE_DP_P1_MAX              2
 
 static bool
 intel_find_best_PLL(const intel_limit_t *limit, struct drm_crtc *crtc,
@@ -474,33 +527,78 @@ static const intel_limit_t intel_limits_pineview_lvds = {
         .find_pll = intel_find_best_PLL,
 };
 
-static const intel_limit_t intel_limits_ironlake_sdvo = {
+static const intel_limit_t intel_limits_ironlake_dac = {
         .dot = { .min = IRONLAKE_DOT_MIN,          .max = IRONLAKE_DOT_MAX },
         .vco = { .min = IRONLAKE_VCO_MIN,          .max = IRONLAKE_VCO_MAX },
-        .n   = { .min = IRONLAKE_N_MIN,            .max = IRONLAKE_N_MAX },
-        .m   = { .min = IRONLAKE_M_MIN,            .max = IRONLAKE_M_MAX },
+        .n   = { .min = IRONLAKE_DAC_N_MIN,        .max = IRONLAKE_DAC_N_MAX },
+        .m   = { .min = IRONLAKE_DAC_M_MIN,        .max = IRONLAKE_DAC_M_MAX },
         .m1  = { .min = IRONLAKE_M1_MIN,           .max = IRONLAKE_M1_MAX },
         .m2  = { .min = IRONLAKE_M2_MIN,           .max = IRONLAKE_M2_MAX },
-        .p   = { .min = IRONLAKE_P_SDVO_DAC_MIN,   .max = IRONLAKE_P_SDVO_DAC_MAX },
-        .p1  = { .min = IRONLAKE_P1_MIN,           .max = IRONLAKE_P1_MAX },
+        .p   = { .min = IRONLAKE_DAC_P_MIN,        .max = IRONLAKE_DAC_P_MAX },
+        .p1  = { .min = IRONLAKE_DAC_P1_MIN,       .max = IRONLAKE_DAC_P1_MAX },
         .p2  = { .dot_limit = IRONLAKE_P2_DOT_LIMIT,
-                 .p2_slow = IRONLAKE_P2_SDVO_DAC_SLOW,
-                 .p2_fast = IRONLAKE_P2_SDVO_DAC_FAST },
+                 .p2_slow = IRONLAKE_DAC_P2_SLOW,
+                 .p2_fast = IRONLAKE_DAC_P2_FAST },
         .find_pll = intel_g4x_find_best_PLL,
 };
 
-static const intel_limit_t intel_limits_ironlake_lvds = {
+static const intel_limit_t intel_limits_ironlake_single_lvds = {
         .dot = { .min = IRONLAKE_DOT_MIN,          .max = IRONLAKE_DOT_MAX },
         .vco = { .min = IRONLAKE_VCO_MIN,          .max = IRONLAKE_VCO_MAX },
-        .n   = { .min = IRONLAKE_N_MIN,            .max = IRONLAKE_N_MAX },
-        .m   = { .min = IRONLAKE_M_MIN,            .max = IRONLAKE_M_MAX },
+        .n   = { .min = IRONLAKE_LVDS_S_N_MIN,     .max = IRONLAKE_LVDS_S_N_MAX },
+        .m   = { .min = IRONLAKE_LVDS_S_M_MIN,     .max = IRONLAKE_LVDS_S_M_MAX },
         .m1  = { .min = IRONLAKE_M1_MIN,           .max = IRONLAKE_M1_MAX },
         .m2  = { .min = IRONLAKE_M2_MIN,           .max = IRONLAKE_M2_MAX },
-        .p   = { .min = IRONLAKE_P_LVDS_MIN,       .max = IRONLAKE_P_LVDS_MAX },
-        .p1  = { .min = IRONLAKE_P1_MIN,           .max = IRONLAKE_P1_MAX },
+        .p   = { .min = IRONLAKE_LVDS_S_P_MIN,     .max = IRONLAKE_LVDS_S_P_MAX },
+        .p1  = { .min = IRONLAKE_LVDS_S_P1_MIN,    .max = IRONLAKE_LVDS_S_P1_MAX },
         .p2  = { .dot_limit = IRONLAKE_P2_DOT_LIMIT,
-                 .p2_slow = IRONLAKE_P2_LVDS_SLOW,
-                 .p2_fast = IRONLAKE_P2_LVDS_FAST },
+                 .p2_slow = IRONLAKE_LVDS_S_P2_SLOW,
+                 .p2_fast = IRONLAKE_LVDS_S_P2_FAST },
+        .find_pll = intel_g4x_find_best_PLL,
+};
+
+static const intel_limit_t intel_limits_ironlake_dual_lvds = {
+        .dot = { .min = IRONLAKE_DOT_MIN,          .max = IRONLAKE_DOT_MAX },
+        .vco = { .min = IRONLAKE_VCO_MIN,          .max = IRONLAKE_VCO_MAX },
+        .n   = { .min = IRONLAKE_LVDS_D_N_MIN,     .max = IRONLAKE_LVDS_D_N_MAX },
+        .m   = { .min = IRONLAKE_LVDS_D_M_MIN,     .max = IRONLAKE_LVDS_D_M_MAX },
+        .m1  = { .min = IRONLAKE_M1_MIN,           .max = IRONLAKE_M1_MAX },
+        .m2  = { .min = IRONLAKE_M2_MIN,           .max = IRONLAKE_M2_MAX },
+        .p   = { .min = IRONLAKE_LVDS_D_P_MIN,     .max = IRONLAKE_LVDS_D_P_MAX },
+        .p1  = { .min = IRONLAKE_LVDS_D_P1_MIN,    .max = IRONLAKE_LVDS_D_P1_MAX },
+        .p2  = { .dot_limit = IRONLAKE_P2_DOT_LIMIT,
+                 .p2_slow = IRONLAKE_LVDS_D_P2_SLOW,
+                 .p2_fast = IRONLAKE_LVDS_D_P2_FAST },
+        .find_pll = intel_g4x_find_best_PLL,
+};
+
+static const intel_limit_t intel_limits_ironlake_single_lvds_100m = {
+        .dot = { .min = IRONLAKE_DOT_MIN,          .max = IRONLAKE_DOT_MAX },
+        .vco = { .min = IRONLAKE_VCO_MIN,          .max = IRONLAKE_VCO_MAX },
+        .n   = { .min = IRONLAKE_LVDS_S_SSC_N_MIN, .max = IRONLAKE_LVDS_S_SSC_N_MAX },
+        .m   = { .min = IRONLAKE_LVDS_S_SSC_M_MIN, .max = IRONLAKE_LVDS_S_SSC_M_MAX },
+        .m1  = { .min = IRONLAKE_M1_MIN,           .max = IRONLAKE_M1_MAX },
+        .m2  = { .min = IRONLAKE_M2_MIN,           .max = IRONLAKE_M2_MAX },
+        .p   = { .min = IRONLAKE_LVDS_S_SSC_P_MIN, .max = IRONLAKE_LVDS_S_SSC_P_MAX },
+        .p1  = { .min = IRONLAKE_LVDS_S_SSC_P1_MIN,.max = IRONLAKE_LVDS_S_SSC_P1_MAX },
+        .p2  = { .dot_limit = IRONLAKE_P2_DOT_LIMIT,
+                 .p2_slow = IRONLAKE_LVDS_S_SSC_P2_SLOW,
+                 .p2_fast = IRONLAKE_LVDS_S_SSC_P2_FAST },
+        .find_pll = intel_g4x_find_best_PLL,
+};
+
+static const intel_limit_t intel_limits_ironlake_dual_lvds_100m = {
+        .dot = { .min = IRONLAKE_DOT_MIN,          .max = IRONLAKE_DOT_MAX },
+        .vco = { .min = IRONLAKE_VCO_MIN,          .max = IRONLAKE_VCO_MAX },
+        .n   = { .min = IRONLAKE_LVDS_D_SSC_N_MIN, .max = IRONLAKE_LVDS_D_SSC_N_MAX },
+        .m   = { .min = IRONLAKE_LVDS_D_SSC_M_MIN, .max = IRONLAKE_LVDS_D_SSC_M_MAX },
+        .m1  = { .min = IRONLAKE_M1_MIN,           .max = IRONLAKE_M1_MAX },
+        .m2  = { .min = IRONLAKE_M2_MIN,           .max = IRONLAKE_M2_MAX },
+        .p   = { .min = IRONLAKE_LVDS_D_SSC_P_MIN, .max = IRONLAKE_LVDS_D_SSC_P_MAX },
+        .p1  = { .min = IRONLAKE_LVDS_D_SSC_P1_MIN,.max = IRONLAKE_LVDS_D_SSC_P1_MAX },
+        .p2  = { .dot_limit = IRONLAKE_P2_DOT_LIMIT,
+                 .p2_slow = IRONLAKE_LVDS_D_SSC_P2_SLOW,
+                 .p2_fast = IRONLAKE_LVDS_D_SSC_P2_FAST },
         .find_pll = intel_g4x_find_best_PLL,
 };
 
@@ -509,34 +607,53 @@ static const intel_limit_t intel_limits_ironlake_display_port = {
                  .max = IRONLAKE_DOT_MAX },
         .vco = { .min = IRONLAKE_VCO_MIN,
                  .max = IRONLAKE_VCO_MAX},
-        .n   = { .min = IRONLAKE_N_MIN,
-                 .max = IRONLAKE_N_MAX },
-        .m   = { .min = IRONLAKE_M_MIN,
-                 .max = IRONLAKE_M_MAX },
+        .n   = { .min = IRONLAKE_DP_N_MIN,
+                 .max = IRONLAKE_DP_N_MAX },
+        .m   = { .min = IRONLAKE_DP_M_MIN,
+                 .max = IRONLAKE_DP_M_MAX },
         .m1  = { .min = IRONLAKE_M1_MIN,
                  .max = IRONLAKE_M1_MAX },
         .m2  = { .min = IRONLAKE_M2_MIN,
                  .max = IRONLAKE_M2_MAX },
-        .p   = { .min = IRONLAKE_P_DISPLAY_PORT_MIN,
-                 .max = IRONLAKE_P_DISPLAY_PORT_MAX },
-        .p1  = { .min = IRONLAKE_P1_DISPLAY_PORT_MIN,
-                 .max = IRONLAKE_P1_DISPLAY_PORT_MAX},
-        .p2  = { .dot_limit = IRONLAKE_P2_DISPLAY_PORT_LIMIT,
-                 .p2_slow = IRONLAKE_P2_DISPLAY_PORT_SLOW,
-                 .p2_fast = IRONLAKE_P2_DISPLAY_PORT_FAST },
+        .p   = { .min = IRONLAKE_DP_P_MIN,
+                 .max = IRONLAKE_DP_P_MAX },
+        .p1  = { .min = IRONLAKE_DP_P1_MIN,
+                 .max = IRONLAKE_DP_P1_MAX},
+        .p2  = { .dot_limit = IRONLAKE_DP_P2_LIMIT,
+                 .p2_slow = IRONLAKE_DP_P2_SLOW,
+                 .p2_fast = IRONLAKE_DP_P2_FAST },
         .find_pll = intel_find_pll_ironlake_dp,
 };
 
 static const intel_limit_t *intel_ironlake_limit(struct drm_crtc *crtc)
 {
+        struct drm_device *dev = crtc->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
         const intel_limit_t *limit;
-        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS))
-                limit = &intel_limits_ironlake_lvds;
-        else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT) ||
+        int refclk = 120;
+
+        if (intel_pipe_has_type(crtc, INTEL_OUTPUT_LVDS)) {
+                if (dev_priv->lvds_use_ssc && dev_priv->lvds_ssc_freq == 100)
+                        refclk = 100;
+
+                if ((I915_READ(PCH_LVDS) & LVDS_CLKB_POWER_MASK) ==
+                    LVDS_CLKB_POWER_UP) {
+                        /* LVDS dual channel */
+                        if (refclk == 100)
+                                limit = &intel_limits_ironlake_dual_lvds_100m;
+                        else
+                                limit = &intel_limits_ironlake_dual_lvds;
+                } else {
+                        if (refclk == 100)
+                                limit = &intel_limits_ironlake_single_lvds_100m;
+                        else
+                                limit = &intel_limits_ironlake_single_lvds;
+                }
+        } else if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT) ||
                         HAS_eDP)
                 limit = &intel_limits_ironlake_display_port;
         else
-                limit = &intel_limits_ironlake_sdvo;
+                limit = &intel_limits_ironlake_dac;
 
         return limit;
 }