Contributors: 9
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jani Nikula |
207 |
56.87% |
19 |
55.88% |
| Ville Syrjälä |
135 |
37.09% |
8 |
23.53% |
| Michał Grzelak |
5 |
1.37% |
1 |
2.94% |
| Daniel Vetter |
5 |
1.37% |
1 |
2.94% |
| Jesse Barnes |
4 |
1.10% |
1 |
2.94% |
| Pankaj Bharadiya |
3 |
0.82% |
1 |
2.94% |
| Nemesa Garg |
2 |
0.55% |
1 |
2.94% |
| Wambui Karuga |
2 |
0.55% |
1 |
2.94% |
| Chris Wilson |
1 |
0.27% |
1 |
2.94% |
| Total |
364 |
|
34 |
|
// SPDX-License-Identifier: MIT
/* Copyright © 2025 Intel Corporation */
#include <drm/drm_print.h>
#include "intel_display_core.h"
#include "intel_display_types.h"
#include "vlv_clock.h"
#include "vlv_sideband.h"
/*
* FIXME: The caching of hpll_freq and czclk_freq relies on the first calls
* occurring at a time when they can actually be read. This appears to be the
* case, but is somewhat fragile. Make the initialization explicit at a point
* where they can be reliably read.
*/
/* returns HPLL frequency in kHz */
int vlv_clock_get_hpll_vco(struct drm_device *drm)
{
struct intel_display *display = to_intel_display(drm);
int hpll_freq, vco_freq[] = { 800, 1600, 2000, 2400 };
if (!display->vlv_clock.hpll_freq) {
vlv_cck_get(display);
/* Obtain SKU information */
hpll_freq = vlv_cck_read(display, CCK_FUSE_REG) &
CCK_FUSE_HPLL_FREQ_MASK;
vlv_cck_put(display);
display->vlv_clock.hpll_freq = vco_freq[hpll_freq] * 1000;
drm_dbg_kms(drm, "HPLL frequency: %d kHz\n", display->vlv_clock.hpll_freq);
}
return display->vlv_clock.hpll_freq;
}
static int vlv_clock_get_cck(struct drm_device *drm,
const char *name, u32 reg, int ref_freq)
{
struct intel_display *display = to_intel_display(drm);
u32 val;
int divider;
vlv_cck_get(display);
val = vlv_cck_read(display, reg);
vlv_cck_put(display);
divider = val & CCK_FREQUENCY_VALUES;
drm_WARN(drm, (val & CCK_FREQUENCY_STATUS) !=
(divider << CCK_FREQUENCY_STATUS_SHIFT),
"%s change in progress\n", name);
return DIV_ROUND_CLOSEST(ref_freq << 1, divider + 1);
}
int vlv_clock_get_hrawclk(struct drm_device *drm)
{
/* RAWCLK_FREQ_VLV register updated from power well code */
return vlv_clock_get_cck(drm, "hrawclk", CCK_DISPLAY_REF_CLOCK_CONTROL,
vlv_clock_get_hpll_vco(drm));
}
int vlv_clock_get_czclk(struct drm_device *drm)
{
struct intel_display *display = to_intel_display(drm);
if (!display->vlv_clock.czclk_freq) {
display->vlv_clock.czclk_freq = vlv_clock_get_cck(drm, "czclk", CCK_CZ_CLOCK_CONTROL,
vlv_clock_get_hpll_vco(drm));
drm_dbg_kms(drm, "CZ clock rate: %d kHz\n", display->vlv_clock.czclk_freq);
}
return display->vlv_clock.czclk_freq;
}
int vlv_clock_get_cdclk(struct drm_device *drm)
{
return vlv_clock_get_cck(drm, "cdclk", CCK_DISPLAY_CLOCK_CONTROL,
vlv_clock_get_hpll_vco(drm));
}
int vlv_clock_get_gpll(struct drm_device *drm)
{
return vlv_clock_get_cck(drm, "GPLL ref", CCK_GPLL_CLOCK_CONTROL,
vlv_clock_get_czclk(drm));
}