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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/pci.h>
#include <drm/drm_atomic.h>
#include <drm/drm_drv.h>
#include "mgag200_drv.h"
/*
* PIXPLLC
*/
static int mgag200_g200eh3_pixpllc_atomic_check(struct drm_crtc *crtc,
struct drm_atomic_state *new_state)
{
static const unsigned int vcomax = 3000000;
static const unsigned int vcomin = 1500000;
static const unsigned int pllreffreq = 25000;
struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
struct mgag200_crtc_state *new_mgag200_crtc_state = to_mgag200_crtc_state(new_crtc_state);
long clock = new_crtc_state->mode.clock;
struct mgag200_pll_values *pixpllc = &new_mgag200_crtc_state->pixpllc;
unsigned int delta, tmpdelta;
unsigned int testp, testm, testn;
unsigned int p, m, n, s;
unsigned int computed;
m = n = p = s = 0;
delta = 0xffffffff;
testp = 0;
for (testm = 150; testm >= 6; testm--) {
if (clock * testm > vcomax)
continue;
if (clock * testm < vcomin)
continue;
for (testn = 120; testn >= 60; testn--) {
computed = (pllreffreq * testn) / testm;
if (computed > clock)
tmpdelta = computed - clock;
else
tmpdelta = clock - computed;
if (tmpdelta < delta) {
delta = tmpdelta;
n = testn + 1;
m = testm + 1;
p = testp + 1;
}
if (delta == 0)
break;
}
if (delta == 0)
break;
}
pixpllc->m = m;
pixpllc->n = n;
pixpllc->p = p;
pixpllc->s = s;
return 0;
}
/*
* DRM device
*/
static const struct mgag200_device_info mgag200_g200eh3_device_info =
MGAG200_DEVICE_INFO_INIT(2048, 2048, 0, false, 1, 0, false);
static const struct mgag200_device_funcs mgag200_g200eh3_device_funcs = {
.pixpllc_atomic_check = mgag200_g200eh3_pixpllc_atomic_check,
.pixpllc_atomic_update = mgag200_g200eh_pixpllc_atomic_update, // same as G200EH
};
struct mga_device *mgag200_g200eh3_device_create(struct pci_dev *pdev,
const struct drm_driver *drv,
enum mga_type type)
{
struct mga_device *mdev;
struct drm_device *dev;
resource_size_t vram_available;
int ret;
mdev = devm_drm_dev_alloc(&pdev->dev, drv, struct mga_device, base);
if (IS_ERR(mdev))
return mdev;
dev = &mdev->base;
pci_set_drvdata(pdev, dev);
ret = mgag200_init_pci_options(pdev, 0x00000120, 0x0000b000);
if (ret)
return ERR_PTR(ret);
ret = mgag200_device_preinit(mdev);
if (ret)
return ERR_PTR(ret);
ret = mgag200_device_init(mdev, type, &mgag200_g200eh3_device_info,
&mgag200_g200eh3_device_funcs);
if (ret)
return ERR_PTR(ret);
mgag200_g200eh_init_registers(mdev); // same as G200EH
vram_available = mgag200_device_probe_vram(mdev);
ret = mgag200_modeset_init(mdev, vram_available);
if (ret)
return ERR_PTR(ret);
return mdev;
}
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