diff options
Diffstat (limited to 'src/drivers/intel/gma/intel_dp.c')
| -rw-r--r-- | src/drivers/intel/gma/intel_dp.c | 72 |
1 files changed, 29 insertions, 43 deletions
diff --git a/src/drivers/intel/gma/intel_dp.c b/src/drivers/intel/gma/intel_dp.c index 833a4d6834..393692bd04 100644 --- a/src/drivers/intel/gma/intel_dp.c +++ b/src/drivers/intel/gma/intel_dp.c @@ -260,7 +260,7 @@ int intel_dp_set_bw(struct intel_dp *intel_dp) int intel_dp_set_lane_count(struct intel_dp *intel_dp) { - printk(BIOS_SPEW, "DP_LANE_COUNT_SET"); + printk(BIOS_SPEW, "DP_LANE_COUNT_SET %d ", intel_dp->lane_count); return intel_dp_aux_native_write_1(intel_dp, DP_LANE_COUNT_SET, intel_dp->lane_count); @@ -471,7 +471,24 @@ unsigned int roundup_power_of_two(unsigned int n) static void compute_m_n(unsigned int m, unsigned int n, unsigned int *ret_m, unsigned int *ret_n) { - *ret_n = MIN(roundup_power_of_two(n), DATA_LINK_N_MAX); + /* We noticed in the IO operations that + * the VBIOS was setting N to DATA_LINK_N_MAX. + * This makes sense, actually: the bigger N is, i.e. + * the bigger the denominator is, the bigger + * the numerator can be, and the more + * bits of numerator you get, the better the result. + * So, first pick the max of the two powers of two. + * And, in the (unlikely) event that you end up with + * something bigger than DATA_LINK_N_MAX, catch that + * case with a MIN. Note the second case is unlikely, + * but we are best off being careful. + */ + /* + * This code is incorrect and will always set ret_n + * to DATA_LINK_N_MAX. + */ + *ret_n = MAX(roundup_power_of_two(n), DATA_LINK_N_MAX); + *ret_n = MIN(*ret_n, DATA_LINK_N_MAX); *ret_m = ( (unsigned long long)m * *ret_n) / n; intel_reduce_m_n_ratio(ret_m, ret_n); } @@ -483,7 +500,6 @@ void intel_dp_compute_m_n(unsigned int bits_per_pixel, struct intel_dp_m_n *m_n) { m_n->tu = 64; - compute_m_n(bits_per_pixel * pixel_clock, link_clock * nlanes * 8, &m_n->gmch_m, &m_n->gmch_n); @@ -492,35 +508,6 @@ void intel_dp_compute_m_n(unsigned int bits_per_pixel, &m_n->link_m, &m_n->link_n); } -/* not sure. */ -void intel_dp_set_m_n(struct intel_dp *intel_dp); - -void -intel_dp_set_m_n(struct intel_dp *intel_dp) -{ - int lane_count; - struct intel_dp_m_n m_n; - int pipe = intel_dp->pipe; - - lane_count = intel_dp->lane_count; - - /* - * Compute the GMCH and Link ratios. The '3' here is - * the number of bytes_per_pixel post-LUT, which we always - * set up for 8-bits of R/G/B, or 3 bytes total. - */ - intel_dp_compute_m_n(intel_dp->bpp, lane_count, - intel_dp->clock, intel_dp->clock, &m_n); - - { - gtt_write(TRANSDATA_M1(pipe), - ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |m_n.gmch_m); - gtt_write(TRANSDATA_N1(pipe),m_n.gmch_n); - gtt_write(TRANSDPLINK_M1(pipe),m_n.link_m); - gtt_write(TRANSDPLINK_N1(pipe),m_n.link_n); - } -} - static void ironlake_edp_pll_off(void); void @@ -1791,17 +1778,13 @@ intel_dp_get_max_downspread(struct intel_dp *intel_dp, u8 *max_downspread) return 1; } -void intel_dp_set_m_n_regs(struct intel_dp *intel_dp) +void intel_dp_set_m_n_regs(struct intel_dp *dp) { - gtt_write(PIPE_DATA_M1(intel_dp->transcoder),0x7e4a0000); - /* gtt_write(0x6f034,0x00800000); */ - /* Write to 0x6f030 has to be 0x7e4ayyyy -- First four hex digits are important. - However, with our formula we always see values 0x7e43yyyy (1366 panel) and - 0x7e42yyy (1280 panel) */ - /* gtt_write(PIPE_DATA_M1(intel_dp->transcoder),TU_SIZE(intel_dp->m_n.tu) | intel_dp->m_n.gmch_m); */ - gtt_write(PIPE_DATA_N1(intel_dp->transcoder),intel_dp->m_n.gmch_n); - gtt_write(PIPE_LINK_M1(intel_dp->transcoder),intel_dp->m_n.link_m); - gtt_write(PIPE_LINK_N1(intel_dp->transcoder),intel_dp->m_n.link_n); + gtt_write(PIPE_DATA_M1(dp->transcoder), + TU_SIZE(dp->m_n.tu) | dp->m_n.gmch_m); + gtt_write(PIPE_DATA_N1(dp->transcoder),dp->m_n.gmch_n); + gtt_write(PIPE_LINK_M1(dp->transcoder),dp->m_n.link_m); + gtt_write(PIPE_LINK_N1(dp->transcoder),dp->m_n.link_n); } void intel_dp_set_resolution(struct intel_dp *intel_dp) @@ -1826,10 +1809,13 @@ int intel_dp_get_training_pattern(struct intel_dp *intel_dp, int intel_dp_get_lane_count(struct intel_dp *intel_dp, u8 *recv) { - return intel_dp_aux_native_read_retry(intel_dp, + int val = intel_dp_aux_native_read_retry(intel_dp, DP_LANE_COUNT_SET, recv, 0); + *recv &= DP_LANE_COUNT_MASK; + printk(BIOS_SPEW, "Lane count %s:%d\n", val < 0 ? "fail" : "ok", *recv); + return val; } int intel_dp_get_lane_align_status(struct intel_dp *intel_dp, |