kboot_gpu: Add proper max-power and leakage calculations for t8112

This uses a similar algorithm to t600x, but with different constants and
exponents. The current limit also engages here, so add it, and add the
t600x one too (even though it is never hit).

Signed-off-by: Asahi Lina <lina@asahilina.net>

src/kboot_gpu.c

@@ -83,10 +83,7 @@ static void load_fuses(float *out, u32 count, u64 base, u32 start, u32 width, fl
 
 static u32 t8103_pwr_scale[] = {0, 63, 80, 108, 150, 198, 210};
 
-// TODO this isn't a static table any more
+static int calc_power_t8103(u32 count, u32 table_count, const struct perf_state *core,
-static u32 t8112_pwr_scale[] = {0, 66, 92, 119, 153, 184, 214, 240, 240};
-
-static int calc_power_t81xx(u32 count, u32 table_count, const struct perf_state *core,
                             const struct perf_state *sram, u32 *max_pwr, float *core_leak,
                             float *sram_leak)
 {
@@ -104,10 +101,6 @@ static int calc_power_t81xx(u32 count, u32 table_count, const struct perf_state
             pwr_scale_count = ARRAY_SIZE(t8103_pwr_scale);
             max_cores = 8;
             break;
-        case T8112:
-            pwr_scale = t8112_pwr_scale;
-            pwr_scale_count = ARRAY_SIZE(t8112_pwr_scale);
-            break;
         default:
             bail("ADT: GPU: Unsupported chip\n");
     }
@@ -137,51 +130,77 @@ static int calc_power_t600x(u32 count, u32 table_count, const struct perf_state
                             const struct perf_state *sram, u32 *max_pwr, float *core_leak,
                             float *sram_leak)
 {
-    const float s_sram = 4.3547606;
+    float s_sram, k_sram, s_core, k_core;
-    const float k_sram = 0.024927923;
+    float dk_core, dk_sram;
-
+    float imax = 1000;
-    // macOS difference: macOS uses a misbehaved piecewise function here
-    // Since it's obviously wrong, let's just use only the first component
-    const float s_core = 1.48461742;
-    const float k_core = 0.39013552;
-
-    const float dk_core = 8.558;
-    const float dk_sram = 0.05;
 
     u32 nclusters = 0;
-    switch (chip_id) {
+    u32 ncores = 0;
-        case T6000:
-            nclusters = 2;
-            break;
-        case T6001:
-            nclusters = 4;
-            break;
-        case T6002:
-            nclusters = 8;
-            break;
-    }
-
     u32 core_count[MAX_CLUSTERS];
 
-    if (get_core_counts(core_count, nclusters, 8))
+    bool simple_exps = false;
-        return -1;
+    bool adjust_leakages = true;
 
+    switch (chip_id) {
+        case T6002:
+            nclusters += 4;
+            load_fuses(core_leak + 4, 4, 0x22922bc1b8, 25, 13, 2, 2, true);
+            load_fuses(sram_leak + 4, 4, 0x22922bc1cc, 4, 9, 1, 1, true);
+            // fallthrough
+        case T6001:
+            nclusters += 2;
+        case T6000:
+            nclusters += 2;
             load_fuses(core_leak + 0, min(4, nclusters), 0x2922bc1b8, 25, 13, 2, 2, false);
             load_fuses(sram_leak + 0, min(4, nclusters), 0x2922bc1cc, 4, 9, 1, 1, false);
 
-    if (nclusters == 8) {
+            s_sram = 4.3547606;
-        load_fuses(core_leak + 4, 4, 0x22922bc1b8, 25, 13, 2, 2, true);
+            k_sram = 0.024927923;
-        load_fuses(sram_leak + 4, 4, 0x22922bc1cc, 4, 9, 1, 1, true);
+            // macOS difference: macOS uses a misbehaved piecewise function here
+            // Since it's obviously wrong, let's just use only the first component
+            s_core = 1.48461742;
+            k_core = 0.39013552;
+            dk_core = 8.558;
+            dk_sram = 0.05;
+
+            ncores = 8;
+            adjust_leakages = true;
+            imax = 26.0;
+            break;
+        case T8112:
+            nclusters = 1;
+            load_fuses(core_leak, 1, 0x23d2c84dc, 30, 13, 2, 2, false);
+            load_fuses(sram_leak, 1, 0x23d2c84b0, 15, 9, 1, 1, false);
+
+            s_sram = 3.61619841;
+            k_sram = 0.0529281;
+            // macOS difference: macOS uses a misbehaved piecewise function here
+            // Since it's obviously wrong, let's just use only the first component
+            s_core = 1.21356187;
+            k_core = 0.43328839;
+            dk_core = 9.83196;
+            dk_sram = 0.07828;
+
+            simple_exps = true;
+            ncores = 10;
+            adjust_leakages = false; // pre-adjusted?
+            imax = 24.0;
+            break;
     }
 
+    if (get_core_counts(core_count, nclusters, ncores))
+        return -1;
+
     printf("FDT: GPU: Core counts: ");
     for (u32 i = 0; i < nclusters; i++) {
         printf("%d ", core_count[i]);
     }
     printf("\n");
 
-    adjust_leakage(core_leak, nclusters, core_count, 8, 0.0825);
+    if (adjust_leakages) {
-    adjust_leakage(sram_leak, nclusters, core_count, 8, 0.2247);
+        adjust_leakage(core_leak, nclusters, core_count, ncores, 0.0825);
+        adjust_leakage(sram_leak, nclusters, core_count, ncores, 0.2247);
+    }
 
     if (table_count != nclusters)
         bail("ADT: GPU: expected %d perf state tables but got %d\n", nclusters, table_count);
@@ -204,17 +223,24 @@ static int calc_power_t600x(u32 count, u32 table_count, const struct perf_state
                   expf(core[idx].volt / 1000.f * s_core);
 
             float sbase = sram[idx].volt / 750.f;
-            float sram_v_p = sbase * sbase * sbase;
+            float sram_v_p;
+            if (simple_exps)
+                sram_v_p = sbase * sbase; // v ^ 2
+            else
+                sram_v_p = sbase * sbase * sbase; // v ^ 3
             mw += dk_sram * (sram[idx].freq / 1000000.f) * sram_v_p;
 
             float cbase = core[idx].volt / 750.f;
             float core_v_p;
-            if (core[idx].volt > 750)
+            if (simple_exps || core[idx].volt < 750)
-                core_v_p = cbase * cbase * cbase; // v ^ 3
-            else
                 core_v_p = cbase * cbase; // v ^ 2
+            else
+                core_v_p = cbase * cbase * cbase; // v ^ 3
             mw += dk_core * (core[idx].freq / 1000000.f) * core_v_p;
 
+            if (mw > imax * core[idx].volt)
+                mw = imax * core[idx].volt;
+
             total_mw += mw;
         }
 
@@ -280,12 +306,12 @@ int dt_set_gpu(void *dt)
 
     switch (chip_id) {
         case T8103:
-        case T8112:
+            calc_power = calc_power_t8103;
-            calc_power = calc_power_t81xx;
             break;
         case T6000:
         case T6001:
         case T6002:
+        case T8112:
             calc_power = calc_power_t600x;
             break;
         default: