Commit cec2a270 authored by Ben Skeggs's avatar Ben Skeggs
Browse files

drm/nva3/pm: tidy and add some comments here and there


Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent 4fd2847e
......@@ -28,15 +28,15 @@
#include "nouveau_pm.h"
static u32 read_clk(struct drm_device *, int, bool);
static u32 read_pll(struct drm_device *, u32, int);
static u32 read_pll(struct drm_device *, int, u32);
static u32
read_vco(struct drm_device *dev, int clk)
{
u32 sctl = nv_rd32(dev, 0x4120 + (clk * 4));
if ((sctl & 0x00000030) != 0x00000030)
return read_pll(dev, 0x00e820, 0x41);
return read_pll(dev, 0x00e8a0, 0x42);
return read_pll(dev, 0x41, 0x00e820);
return read_pll(dev, 0x42, 0x00e8a0);
}
static u32
......@@ -44,6 +44,7 @@ read_clk(struct drm_device *dev, int clk, bool ignore_en)
{
u32 sctl, sdiv, sclk;
/* refclk for the 0xe8xx plls always 27KHz */
if (clk >= 0x40)
return 27000;
......@@ -68,7 +69,7 @@ read_clk(struct drm_device *dev, int clk, bool ignore_en)
}
static u32
read_pll(struct drm_device *dev, u32 pll, int clk)
read_pll(struct drm_device *dev, int clk, u32 pll)
{
u32 ctrl = nv_rd32(dev, pll + 0);
u32 sclk, P = 1, N = 1, M = 1;
......@@ -78,6 +79,8 @@ read_pll(struct drm_device *dev, u32 pll, int clk)
M = (coef & 0x000000ff) >> 0;
N = (coef & 0x0000ff00) >> 8;
P = (coef & 0x003f0000) >> 16;
/* not post-divider on these.. */
if ((pll & 0x00ff00) == 0x00e800)
P = 1;
......@@ -95,7 +98,7 @@ struct creg {
};
static int
calc_clk(struct drm_device *dev, u32 pll, int clk, u32 khz, struct creg *reg)
calc_clk(struct drm_device *dev, int clk, u32 pll, u32 khz, struct creg *reg)
{
struct pll_lims limits;
u32 oclk, sclk, sdiv;
......@@ -104,6 +107,10 @@ calc_clk(struct drm_device *dev, u32 pll, int clk, u32 khz, struct creg *reg)
reg->pll = 0;
reg->clk = 0;
if (!khz) {
NV_DEBUG(dev, "no clock for 0x%04x/0x%02x\n", pll, clk);
return 0;
}
switch (khz) {
case 27000:
......@@ -118,6 +125,14 @@ calc_clk(struct drm_device *dev, u32 pll, int clk, u32 khz, struct creg *reg)
default:
sclk = read_vco(dev, clk);
sdiv = min((sclk * 2) / (khz - 2999), (u32)65);
/* if the clock has a PLL attached, and we can get a within
* [-2, 3) MHz of a divider, we'll disable the PLL and use
* the divider instead.
*
* divider can go as low as 2, limited here because NVIDIA
* and the VBIOS on my NVA8 seem to prefer using the PLL
* for 810MHz - is there a good reason?
*/
if (sdiv > 4) {
oclk = (sclk * 2) / sdiv;
diff = khz - oclk;
......@@ -126,6 +141,12 @@ calc_clk(struct drm_device *dev, u32 pll, int clk, u32 khz, struct creg *reg)
return oclk;
}
}
if (!pll) {
NV_ERROR(dev, "bad freq %02x: %d %d\n", clk, khz, sclk);
return -ERANGE;
}
break;
}
......@@ -145,12 +166,53 @@ calc_clk(struct drm_device *dev, u32 pll, int clk, u32 khz, struct creg *reg)
return ret;
}
static void
prog_pll(struct drm_device *dev, int clk, u32 pll, struct creg *reg)
{
const u32 src0 = 0x004120 + (clk * 4);
const u32 src1 = 0x004160 + (clk * 4);
const u32 ctrl = pll + 0;
const u32 coef = pll + 4;
u32 cntl;
if (!reg->clk && !reg->pll) {
NV_DEBUG(dev, "no clock for %02x\n", clk);
return;
}
cntl = nv_rd32(dev, ctrl) & 0xfffffff2;
if (reg->pll) {
nv_mask(dev, src0, 0x00000101, 0x00000101);
nv_wr32(dev, coef, reg->pll);
nv_wr32(dev, ctrl, cntl | 0x00000015);
nv_mask(dev, src1, 0x00000100, 0x00000000);
nv_mask(dev, src1, 0x00000001, 0x00000000);
} else {
nv_mask(dev, src1, 0x003f3141, 0x00000101 | reg->clk);
nv_wr32(dev, ctrl, cntl | 0x0000001d);
nv_mask(dev, ctrl, 0x00000001, 0x00000000);
nv_mask(dev, src0, 0x00000100, 0x00000000);
nv_mask(dev, src0, 0x00000001, 0x00000000);
}
}
static void
prog_clk(struct drm_device *dev, int clk, struct creg *reg)
{
if (!reg->clk) {
NV_DEBUG(dev, "no clock for %02x\n", clk);
return;
}
nv_mask(dev, 0x004120 + (clk * 4), 0x003f3141, 0x00000101 | reg->clk);
}
int
nva3_pm_clocks_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
{
perflvl->core = read_pll(dev, 0x4200, 0);
perflvl->shader = read_pll(dev, 0x4220, 1);
perflvl->memory = read_pll(dev, 0x4000, 2);
perflvl->core = read_pll(dev, 0x00, 0x4200);
perflvl->shader = read_pll(dev, 0x01, 0x4220);
perflvl->memory = read_pll(dev, 0x02, 0x4000);
perflvl->unka0 = read_clk(dev, 0x20, false);
perflvl->vdec = read_clk(dev, 0x21, false);
return 0;
......@@ -174,23 +236,23 @@ nva3_pm_clocks_pre(struct drm_device *dev, struct nouveau_pm_level *perflvl)
if (!info)
return ERR_PTR(-ENOMEM);
ret = calc_clk(dev, 0x4200, 0x10, perflvl->core, &info->nclk);
ret = calc_clk(dev, 0x10, 0x4200, perflvl->core, &info->nclk);
if (ret < 0)
goto out;
ret = calc_clk(dev, 0x4220, 0x11, perflvl->shader, &info->sclk);
ret = calc_clk(dev, 0x11, 0x4220, perflvl->shader, &info->sclk);
if (ret < 0)
goto out;
ret = calc_clk(dev, 0x4000, 0x12, perflvl->memory, &info->mclk);
ret = calc_clk(dev, 0x12, 0x4000, perflvl->memory, &info->mclk);
if (ret < 0)
goto out;
ret = calc_clk(dev, 0x0000, 0x20, perflvl->unka0, &info->unka0);
ret = calc_clk(dev, 0x20, 0x0000, perflvl->unka0, &info->unka0);
if (ret < 0)
goto out;
ret = calc_clk(dev, 0x0000, 0x21, perflvl->vdec, &info->vdec);
ret = calc_clk(dev, 0x21, 0x0000, perflvl->vdec, &info->vdec);
if (ret < 0)
goto out;
......@@ -202,51 +264,20 @@ out:
return info;
}
static void
prog_pll(struct drm_device *dev, u32 pll, int clk, struct creg *reg)
{
const u32 src0 = 0x004120 + (clk * 4);
const u32 src1 = 0x004160 + (clk * 4);
const u32 ctrl = pll + 0;
const u32 coef = pll + 4;
u32 cntl;
cntl = nv_rd32(dev, ctrl) & 0xfffffff2;
if (reg->pll) {
nv_mask(dev, src0, 0x00000101, 0x00000101);
nv_wr32(dev, coef, reg->pll);
nv_wr32(dev, ctrl, cntl | 0x00000015);
nv_mask(dev, src1, 0x00000100, 0x00000000);
nv_mask(dev, src1, 0x00000001, 0x00000000);
} else {
nv_mask(dev, src1, 0x003f3141, 0x00000101 | reg->clk);
nv_wr32(dev, ctrl, cntl | 0x0000001d);
nv_mask(dev, ctrl, 0x00000001, 0x00000000);
nv_mask(dev, src0, 0x00000100, 0x00000000);
nv_mask(dev, src0, 0x00000001, 0x00000000);
}
}
static void
prog_clk(struct drm_device *dev, int clk, struct creg *reg)
{
nv_mask(dev, 0x004120 + (clk * 4), 0x003f3141, 0x00000101 | reg->clk);
}
void
nva3_pm_clocks_set(struct drm_device *dev, void *pre_state)
{
struct nva3_pm_state *info = pre_state;
prog_pll(dev, 0x004200, 0, &info->nclk);
prog_pll(dev, 0x004220, 1, &info->sclk);
prog_pll(dev, 0x00, 0x004200, &info->nclk);
prog_pll(dev, 0x01, 0x004220, &info->sclk);
prog_clk(dev, 0x20, &info->unka0);
prog_clk(dev, 0x21, &info->vdec);
nv_wr32(dev, 0x100210, 0);
nv_wr32(dev, 0x1002dc, 1);
nv_wr32(dev, 0x004018, 0x00001000);
prog_pll(dev, 0x004000, 2, &info->mclk);
prog_pll(dev, 0x02, 0x004000, &info->mclk);
if (nv_rd32(dev, 0x4000) & 0x00000008)
nv_wr32(dev, 0x004018, 0x1000d000);
else
......
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