drm/mgag200: Add support for a new rev of G200e
- Added PLL algorithm for a new rev of G200e - Removed the bandwidth limitation for the new G200e Signed-off-by: Mathieu Larouche <mathieu.larouche@matrox.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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6d857c18ae
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e829d7ef9f
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@ -104,6 +104,8 @@ static bool mga_crtc_mode_fixup(struct drm_crtc *crtc,
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return true;
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}
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#define P_ARRAY_SIZE 9
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static int mga_g200se_set_plls(struct mga_device *mdev, long clock)
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{
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unsigned int vcomax, vcomin, pllreffreq;
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@ -111,37 +113,97 @@ static int mga_g200se_set_plls(struct mga_device *mdev, long clock)
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unsigned int testp, testm, testn;
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unsigned int p, m, n;
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unsigned int computed;
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unsigned int pvalues_e4[P_ARRAY_SIZE] = {16, 14, 12, 10, 8, 6, 4, 2, 1};
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unsigned int fvv;
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unsigned int i;
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m = n = p = 0;
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vcomax = 320000;
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vcomin = 160000;
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pllreffreq = 25000;
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if (mdev->unique_rev_id <= 0x03) {
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delta = 0xffffffff;
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permitteddelta = clock * 5 / 1000;
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m = n = p = 0;
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vcomax = 320000;
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vcomin = 160000;
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pllreffreq = 25000;
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for (testp = 8; testp > 0; testp /= 2) {
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if (clock * testp > vcomax)
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continue;
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if (clock * testp < vcomin)
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continue;
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delta = 0xffffffff;
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permitteddelta = clock * 5 / 1000;
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for (testn = 17; testn < 256; testn++) {
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for (testm = 1; testm < 32; testm++) {
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computed = (pllreffreq * testn) /
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(testm * testp);
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if (computed > clock)
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tmpdelta = computed - clock;
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else
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tmpdelta = clock - computed;
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if (tmpdelta < delta) {
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delta = tmpdelta;
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m = testm - 1;
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n = testn - 1;
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p = testp - 1;
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for (testp = 8; testp > 0; testp /= 2) {
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if (clock * testp > vcomax)
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continue;
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if (clock * testp < vcomin)
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continue;
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for (testn = 17; testn < 256; testn++) {
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for (testm = 1; testm < 32; testm++) {
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computed = (pllreffreq * testn) /
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(testm * testp);
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if (computed > clock)
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tmpdelta = computed - clock;
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else
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tmpdelta = clock - computed;
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if (tmpdelta < delta) {
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delta = tmpdelta;
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m = testm - 1;
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n = testn - 1;
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p = testp - 1;
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}
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}
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}
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}
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} else {
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m = n = p = 0;
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vcomax = 1600000;
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vcomin = 800000;
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pllreffreq = 25000;
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if (clock < 25000)
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clock = 25000;
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clock = clock * 2;
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delta = 0xFFFFFFFF;
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/* Permited delta is 0.5% as VESA Specification */
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permitteddelta = clock * 5 / 1000;
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for (i = 0 ; i < P_ARRAY_SIZE ; i++) {
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testp = pvalues_e4[i];
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if ((clock * testp) > vcomax)
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continue;
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if ((clock * testp) < vcomin)
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continue;
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for (testn = 50; testn <= 256; testn++) {
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for (testm = 1; testm <= 32; testm++) {
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computed = (pllreffreq * testn) /
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(testm * testp);
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if (computed > clock)
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tmpdelta = computed - clock;
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else
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tmpdelta = clock - computed;
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if (tmpdelta < delta) {
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delta = tmpdelta;
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m = testm - 1;
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n = testn - 1;
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p = testp - 1;
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}
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}
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}
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}
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fvv = pllreffreq * testn / testm;
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fvv = (fvv - 800000) / 50000;
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if (fvv > 15)
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fvv = 15;
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p |= (fvv << 4);
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m |= 0x80;
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clock = clock / 2;
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}
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if (delta > permitteddelta) {
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@ -1540,7 +1602,7 @@ static int mga_vga_mode_valid(struct drm_connector *connector,
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if (mga_vga_calculate_mode_bandwidth(mode, bpp)
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> (24400 * 1024))
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return MODE_BANDWIDTH;
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} else if (mdev->unique_rev_id >= 0x02) {
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} else if (mdev->unique_rev_id == 0x02) {
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if (mode->hdisplay > 1920)
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return MODE_VIRTUAL_X;
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if (mode->vdisplay > 1200)
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