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>
diff --git a/drivers/gpu/drm/nouveau/nva3_pm.c b/drivers/gpu/drm/nouveau/nva3_pm.c
index 5a68958..5285b98 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 @@
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;
+ struct nva3_pm_state *pll;
+ struct pll_lims limits;
+ int N, fN, M, P, diff;
+ int ret, off;
- state = kzalloc(sizeof(*state), GFP_KERNEL);
- if (!state)
- return ERR_PTR(-ENOMEM);
-
- 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;
- nv_wr32(dev, reg + 4, (state->P << 16) | (state->N << 8) | state->M);
- kfree(state);
+ /* 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);
+ }
+
+ kfree(pll);
}