drm/i915/icl: Implement HSDIV_RATIO of MG_CLKTOP2_HSCLKCTL_PORT reg as separate divid...

The register value of Divider Ratio for high speed divider
(hsdiv_ratio) in MG_CLKTOP2_HSCLKCTL_PORT register is not same as the
actual numerical value of the divider. So this patch implements
separate divider value defines for that field.
icl_mg_pll_find_divisors() can use these defines instead of magic
register values.

The new defines are going to be used in the next patch.

v2 (from Paulo):
 * Rebase.
 * Make it look a little more like the rest of our code.
v3 (from Paulo):
 * Make hsdiv u32 now that it's a bit field (José).

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Suggested-by: James Ausmus <james.ausmus@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180817215209.29133-1-paulo.r.zanoni@intel.com

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5121b9f..8d3a7fe 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9391,8 +9391,11 @@ enum skl_power_gate {
 #define   MG_CLKTOP2_HSCLKCTL_CORE_INPUTSEL_MASK       (0x1 << 16)
 #define   MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL(x)       ((x) << 14)
 #define   MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL_MASK     (0x3 << 14)
-#define   MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO(x)           ((x) << 12)
 #define   MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_MASK         (0x3 << 12)
+#define   MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_2            (0 << 12)
+#define   MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_3            (1 << 12)
+#define   MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_5            (2 << 12)
+#define   MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_7            (3 << 12)
 #define   MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO(x)           ((x) << 8)
 #define   MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO_MASK         (0xf << 8)
 #define MG_CLKTOP2_HSCLKCTL(port) _MMIO_PORT((port) - PORT_C, \

diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c
index 20c9068..04d41bc 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c
@@ -2643,7 +2643,8 @@ static bool icl_mg_pll_find_divisors(int clock_khz, bool is_dp, bool use_ssc,
 
                for (div2 = 10; div2 > 0; div2--) {
                        int dco = div1 * div2 * clock_khz * 5;
-                       int a_divratio, tlinedrv, inputsel, hsdiv;
+                       int a_divratio, tlinedrv, inputsel;
+                       u32 hsdiv;
 
                        if (dco < dco_min_freq || dco > dco_max_freq)
                                continue;
@@ -2662,16 +2663,16 @@ static bool icl_mg_pll_find_divisors(int clock_khz, bool is_dp, bool use_ssc,
                                MISSING_CASE(div1);
                                /* fall through */
                        case 2:
-                               hsdiv = 0;
+                               hsdiv = MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_2;
                                break;
                        case 3:
-                               hsdiv = 1;
+                               hsdiv = MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_3;
                                break;
                        case 5:
-                               hsdiv = 2;
+                               hsdiv = MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_5;
                                break;
                        case 7:
-                               hsdiv = 3;
+                               hsdiv = MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_7;
                                break;
                        }
 
@@ -2685,7 +2686,7 @@ static bool icl_mg_pll_find_divisors(int clock_khz, bool is_dp, bool use_ssc,
                        state->mg_clktop2_hsclkctl =
                                MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL(tlinedrv) |
                                MG_CLKTOP2_HSCLKCTL_CORE_INPUTSEL(inputsel) |
-                               MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO(hsdiv) |
+                               hsdiv |
                                MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO(div2);
 
                        return true;