diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/intelfb/intelfbhw.c | 73 |
1 files changed, 34 insertions, 39 deletions
diff --git a/drivers/video/intelfb/intelfbhw.c b/drivers/video/intelfb/intelfbhw.c index 82a2b9048df9..5a621df5bf02 100644 --- a/drivers/video/intelfb/intelfbhw.c +++ b/drivers/video/intelfb/intelfbhw.c @@ -600,23 +600,19 @@ static int calc_vclock3(int index, int m, int n, int p) static int calc_vclock(int index, int m1, int m2, int n, int p1, int p2, int lvds) { - int p2_val; - switch(index) - { - case PLLS_I9xx: - if (p1 == 0) - return 0; - if (lvds) - p2_val = p2 ? 7 : 14; - else - p2_val = p2 ? 5 : 10; - return ((plls[index].ref_clk * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / - ((p1)) * (p2_val))); - case PLLS_I8xx: - default: - return ((plls[index].ref_clk * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) / - ((p1+2) * (1 << (p2 + 1))))); + struct pll_min_max *pll = &plls[index]; + u32 m, vco, p; + + m = (5 * (m1 + 2)) + (m2 + 2); + n += 2; + vco = pll->ref_clk * m / n; + + if (index == PLLS_I8xx) { + p = ((p1 + 2) * (1 << (p2 + 1))); + } else { + p = ((p1) * (p2 ? 5 : 10)); } + return vco / p; } void @@ -852,9 +848,11 @@ splitm(int index, unsigned int m, unsigned int *retm1, unsigned int *retm2) { int m1, m2; int testm; + struct pll_min_max *pll = &plls[index]; + /* no point optimising too much - brute force m */ - for (m1 = plls[index].min_m1; m1 < plls[index].max_m1+1; m1++) { - for (m2 = plls[index].min_m2; m2 < plls[index].max_m2+1; m2++) { + for (m1 = pll->min_m1; m1 < pll->max_m1 + 1; m1++) { + for (m2 = pll->min_m2; m2 < pll->max_m2 + 1; m2++) { testm = (5 * (m1 + 2)) + (m2 + 2); if (testm == m) { *retm1 = (unsigned int)m1; @@ -871,6 +869,7 @@ static int splitp(int index, unsigned int p, unsigned int *retp1, unsigned int *retp2) { int p1, p2; + struct pll_min_max *pll = &plls[index]; if (index == PLLS_I9xx) { p2 = (p % 10) ? 1 : 0; @@ -882,27 +881,23 @@ splitp(int index, unsigned int p, unsigned int *retp1, unsigned int *retp2) return 0; } - if (index == PLLS_I8xx) { - if (p % 4 == 0) - p2 = 1; - else - p2 = 0; + if (p % 4 == 0) + p2 = 1; + else + p2 = 0; + p1 = (p / (1 << (p2 + 1))) - 2; + if (p % 4 == 0 && p1 < pll->min_p1) { + p2 = 0; p1 = (p / (1 << (p2 + 1))) - 2; - if (p % 4 == 0 && p1 < plls[index].min_p1) { - p2 = 0; - p1 = (p / (1 << (p2 + 1))) - 2; - } - if (p1 < plls[index].min_p1 || - p1 > plls[index].max_p1 || - (p1 + 2) * (1 << (p2 + 1)) != p) { - return 1; - } else { - *retp1 = (unsigned int)p1; - *retp2 = (unsigned int)p2; - return 0; - } } - return 1; + if (p1 < pll->min_p1 || p1 > pll->max_p1 || + (p1 + 2) * (1 << (p2 + 1)) != p) { + return 1; + } else { + *retp1 = (unsigned int)p1; + *retp2 = (unsigned int)p2; + return 0; + } } static int @@ -952,7 +947,7 @@ calc_pll_params(int index, int clock, u32 *retm1, u32 *retm2, u32 *retn, u32 *re m = pll->max_m - 1; for (testm = m - 1; testm <= m; testm++) { f_out = calc_vclock3(index, m, n, p); - if (splitm(index, m, &m1, &m2)) { + if (splitm(index, testm, &m1, &m2)) { WRN_MSG("cannot split m = %d\n", m); n++; continue; @@ -963,7 +958,7 @@ calc_pll_params(int index, int clock, u32 *retm1, u32 *retm2, u32 *retn, u32 *re f_err = f_out - clock + 1; if (f_err < err_best) { - m_best = m; + m_best = testm; n_best = n; p_best = p; f_best = f_out; |