diff options
Diffstat (limited to 'drivers/gpu/drm/mgag200/mgag200_g200ew3.c')
| -rw-r--r-- | drivers/gpu/drm/mgag200/mgag200_g200ew3.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mgag200/mgag200_g200ew3.c b/drivers/gpu/drm/mgag200/mgag200_g200ew3.c index 19a870120ebc..29aa8a3d4522 100644 --- a/drivers/gpu/drm/mgag200/mgag200_g200ew3.c +++ b/drivers/gpu/drm/mgag200/mgag200_g200ew3.c @@ -2,6 +2,7 @@ #include <linux/pci.h> +#include <drm/drm_atomic.h> #include <drm/drm_drv.h> #include "mgag200_drv.h" @@ -14,6 +15,64 @@ static void mgag200_g200ew3_init_registers(struct mga_device *mdev) } /* + * PIXPLLC + */ + +static int mgag200_g200ew3_pixpllc_atomic_check(struct drm_crtc *crtc, + struct drm_atomic_state *new_state) +{ + static const unsigned int vcomax = 800000; + static const unsigned int vcomin = 400000; + 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, testp2; + unsigned int p, m, n, s; + unsigned int computed; + + m = n = p = s = 0; + delta = 0xffffffff; + + for (testp = 1; testp < 8; testp++) { + for (testp2 = 1; testp2 < 8; testp2++) { + if (testp < testp2) + continue; + if ((clock * testp * testp2) > vcomax) + continue; + if ((clock * testp * testp2) < vcomin) + continue; + for (testm = 1; testm < 26; testm++) { + for (testn = 32; testn < 2048 ; testn++) { + computed = (pllreffreq * testn) / (testm * testp * testp2); + if (computed > clock) + tmpdelta = computed - clock; + else + tmpdelta = clock - computed; + if (tmpdelta < delta) { + delta = tmpdelta; + m = testm + 1; + n = testn + 1; + p = testp + 1; + s = testp2; + } + } + } + } + } + + pixpllc->m = m; + pixpllc->n = n; + pixpllc->p = p; + pixpllc->s = s; + + return 0; +} + +/* * DRM device */ @@ -23,6 +82,8 @@ static const struct mgag200_device_info mgag200_g200ew3_device_info = static const struct mgag200_device_funcs mgag200_g200ew3_device_funcs = { .disable_vidrst = mgag200_bmc_disable_vidrst, .enable_vidrst = mgag200_bmc_enable_vidrst, + .pixpllc_atomic_check = mgag200_g200ew3_pixpllc_atomic_check, + .pixpllc_atomic_update = mgag200_g200wb_pixpllc_atomic_update, // same as G200WB }; static resource_size_t mgag200_g200ew3_device_probe_vram(struct mga_device *mdev) |