drm/nva3/pm: initial pass at set_clock() hook

I still discourage anyone from actually doing this yet.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 94 insertions, 21 deletions

diff --git a/drivers/gpu/drm/nouveau/nva3_pm.c b/drivers/gpu/drm/nouveau/nva3_pm.c
index 5a68958f076b..5285b9813700 100644
--- a/drivers/gpu/drm/nouveau/nva3_pm.c
+++ b/drivers/gpu/drm/nouveau/nva3_pm.c
@@ -34,8 +34,14 @@
  */
 
 struct nva3_pm_state {
-        struct pll_lims pll;
-        int N, M, P;
+        enum pll_types type;
+        u32 src0;
+        u32 src1;
+        u32 ctrl;
+        u32 coef;
+        u32 old_pnm;
+        u32 new_pnm;
+        u32 new_div;
 };
 
 static int
@@ -96,36 +102,103 @@ void *
 nva3_pm_clock_pre(struct drm_device *dev, struct nouveau_pm_level *perflvl,
                   u32 id, int khz)
 {
-        struct nva3_pm_state *state;
-        int dummy, ret;
-
-        state = kzalloc(sizeof(*state), GFP_KERNEL);
-        if (!state)
-                return ERR_PTR(-ENOMEM);
+        struct nva3_pm_state *pll;
+        struct pll_lims limits;
+        int N, fN, M, P, diff;
+        int ret, off;
 
-        ret = get_pll_limits(dev, id, &state->pll);
-        if (ret < 0) {
-                kfree(state);
+        ret = get_pll_limits(dev, id, &limits);
+        if (ret < 0)
                 return (ret == -ENOENT) ? NULL : ERR_PTR(ret);
+
+        off = nva3_pm_pll_offset(id);
+        if (id < 0)
+                return ERR_PTR(-EINVAL);
+
+
+        pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+        if (!pll)
+                return ERR_PTR(-ENOMEM);
+        pll->type = id;
+        pll->src0 = 0x004120 + (off * 4);
+        pll->src1 = 0x004160 + (off * 4);
+        pll->ctrl = limits.reg + 0;
+        pll->coef = limits.reg + 4;
+
+        /* If target clock is within [-2, 3) MHz of a divisor, we'll
+         * use that instead of calculating MNP values
+         */
+        pll->new_div = ((limits.refclk * 2) / (khz - 2999)) & 0x0f;
+        if (pll->new_div) {
+                diff = khz - ((limits.refclk * 2) / pll->new_div);
+                if (diff < -2000 || diff >= 3000)
+                        pll->new_div = 0;
         }
 
-        ret = nv50_calc_pll2(dev, &state->pll, khz, &state->N, &dummy,
-                             &state->M, &state->P);
-        if (ret < 0) {
-                kfree(state);
-                return ERR_PTR(ret);
+        if (!pll->new_div) {
+                ret = nv50_calc_pll2(dev, &limits, khz, &N, &fN, &M, &P);
+                if (ret < 0)
+                        return ERR_PTR(ret);
+
+                pll->new_pnm = (P << 16) | (N << 8) | M;
+                pll->new_div = 2 - 1;
+        } else {
+                pll->new_pnm = 0;
+                pll->new_div--;
         }
 
-        return state;
+        if ((nv_rd32(dev, pll->src1) & 0x00000101) != 0x00000101)
+                pll->old_pnm = nv_rd32(dev, pll->coef);
+        return pll;
 }
 
 void
 nva3_pm_clock_set(struct drm_device *dev, void *pre_state)
 {
-        struct nva3_pm_state *state = pre_state;
-        u32 reg = state->pll.reg;
+        struct nva3_pm_state *pll = pre_state;
+        u32 ctrl = 0;
+
+        /* For the memory clock, NVIDIA will build a "script" describing
+         * the reclocking process and ask PDAEMON to execute it.
+         */
+        if (pll->type == PLL_MEMORY) {
+                nv_wr32(dev, 0x100210, 0);
+                nv_wr32(dev, 0x1002dc, 1);
+                nv_wr32(dev, 0x004018, 0x00001000);
+                ctrl = 0x18000100;
+        }
+
+        if (pll->old_pnm || !pll->new_pnm) {
+                nv_mask(dev, pll->src1, 0x003c0101, 0x00000101 |
+                                                    (pll->new_div << 18));
+                nv_wr32(dev, pll->ctrl, 0x0001001d | ctrl);
+                nv_mask(dev, pll->ctrl, 0x00000001, 0x00000000);
+        }
+
+        if (pll->new_pnm) {
+                nv_mask(dev, pll->src0, 0x00000101, 0x00000101);
+                nv_wr32(dev, pll->coef, pll->new_pnm);
+                nv_wr32(dev, pll->ctrl, 0x0001001d | ctrl);
+                nv_mask(dev, pll->ctrl, 0x00000010, 0x00000000);
+                nv_mask(dev, pll->ctrl, 0x00020010, 0x00020010);
+                nv_wr32(dev, pll->ctrl, 0x00010015 | ctrl);
+                nv_mask(dev, pll->src1, 0x00000100, 0x00000000);
+                nv_mask(dev, pll->src1, 0x00000001, 0x00000000);
+                if (pll->type == PLL_MEMORY)
+                        nv_wr32(dev, 0x4018, 0x10005000);
+        } else {
+                nv_mask(dev, pll->ctrl, 0x00000001, 0x00000000);
+                nv_mask(dev, pll->src0, 0x00000100, 0x00000000);
+                nv_mask(dev, pll->src0, 0x00000001, 0x00000000);
+                if (pll->type == PLL_MEMORY)
+                        nv_wr32(dev, 0x4018, 0x1000d000);
+        }
+
+        if (pll->type == PLL_MEMORY) {
+                nv_wr32(dev, 0x1002dc, 0);
+                nv_wr32(dev, 0x100210, 0x80000000);
+        }
 
-        nv_wr32(dev, reg + 4, (state->P << 16) | (state->N << 8) | state->M);
-        kfree(state);
+        kfree(pll);
 }