2 * Copyright 2010 Red Hat Inc.
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5 * copy of this software and associated documentation files (the "Software"),
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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 * OTHER DEALINGS IN THE SOFTWARE.
25 #include <subdev/clock.h>
26 #include <subdev/bios.h>
27 #include <subdev/bios/pll.h>
32 nva3_pll_calc(struct nouveau_subdev
*subdev
, struct nvbios_pll
*info
,
33 u32 freq
, int *pN
, int *pfN
, int *pM
, int *P
)
35 u32 best_err
= ~0, err
;
38 *P
= info
->vco1
.max_freq
/ freq
;
44 lM
= (info
->refclk
+ info
->vco1
.max_inputfreq
) / info
->vco1
.max_inputfreq
;
45 lM
= max(lM
, (int)info
->vco1
.min_m
);
46 hM
= (info
->refclk
+ info
->vco1
.min_inputfreq
) / info
->vco1
.min_inputfreq
;
47 hM
= min(hM
, (int)info
->vco1
.max_m
);
49 for (M
= lM
; M
<= hM
; M
++) {
50 u32 tmp
= freq
* *P
* M
;
51 N
= tmp
/ info
->refclk
;
52 fN
= tmp
% info
->refclk
;
53 if (!pfN
&& fN
>= info
->refclk
/ 2)
56 if (N
< info
->vco1
.min_n
)
58 if (N
> info
->vco1
.max_n
)
61 err
= abs(freq
- (info
->refclk
* N
/ M
/ *P
));
69 *pfN
= (((fN
<< 13) / info
->refclk
) - 4096) & 0xffff;
74 if (unlikely(best_err
== ~0)) {
75 nv_error(subdev
, "unable to find matching pll values\n");
79 return info
->refclk
* *pN
/ *pM
/ *P
;
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