diff options
| -rw-r--r-- | drivers/video/fbdev/msm/mdss_dp.c | 20 | ||||
| -rw-r--r-- | drivers/video/fbdev/msm/mdss_dp.h | 3 | ||||
| -rw-r--r-- | drivers/video/fbdev/msm/mdss_dp_aux.c | 31 |
3 files changed, 54 insertions, 0 deletions
diff --git a/drivers/video/fbdev/msm/mdss_dp.c b/drivers/video/fbdev/msm/mdss_dp.c index 24dacab572ad..c4b25627184b 100644 --- a/drivers/video/fbdev/msm/mdss_dp.c +++ b/drivers/video/fbdev/msm/mdss_dp.c @@ -906,6 +906,26 @@ int mdss_dp_on(struct mdss_panel_data *pdata) mdss_dp_irq_enable(dp_drv); pr_debug("irq enabled\n"); mdss_dp_dpcd_cap_read(dp_drv); + dp_drv->link_rate = + mdss_dp_gen_link_clk(&dp_drv->panel_data.panel_info, + dp_drv->dpcd.max_lane_count); + + pr_debug("link_rate=0x%x, Max rate supported by sink=0x%x\n", + dp_drv->link_rate, dp_drv->dpcd.max_link_rate); + if (!dp_drv->link_rate) { + pr_err("Unable to configure required link rate\n"); + return -EINVAL; + } + + pr_debug("link_rate = 0x%x\n", dp_drv->link_rate); + + dp_drv->power_data[DP_CTRL_PM].clk_config[0].rate = + dp_drv->link_rate * DP_LINK_RATE_MULTIPLIER; + + dp_drv->pixel_rate = dp_drv->panel_data.panel_info.clk_rate; + dp_drv->power_data[DP_CTRL_PM].clk_config[3].rate = + dp_drv->pixel_rate; + ret = mdss_dp_clk_ctrl(dp_drv, DP_CTRL_PM, true); if (ret) { mdss_dp_clk_ctrl(dp_drv, DP_CORE_PM, false); diff --git a/drivers/video/fbdev/msm/mdss_dp.h b/drivers/video/fbdev/msm/mdss_dp.h index 9d129d04a9c8..6bf4aaed1bc9 100644 --- a/drivers/video/fbdev/msm/mdss_dp.h +++ b/drivers/video/fbdev/msm/mdss_dp.h @@ -164,6 +164,8 @@ enum dp_pm_type { #define DP_LINK_RATE_540 20 /* 5.40G = 270M * 20 */ #define DP_LINK_RATE_MAX DP_LINK_RATE_540 +#define DP_LINK_RATE_MULTIPLIER 27000000 + struct dpcd_cap { char major; char minor; @@ -388,5 +390,6 @@ void mdss_dp_fill_link_cfg(struct mdss_dp_drv_pdata *ep); void mdss_dp_sink_power_down(struct mdss_dp_drv_pdata *ep); void mdss_dp_lane_power_ctrl(struct mdss_dp_drv_pdata *ep, int up); void mdss_dp_config_ctrl(struct mdss_dp_drv_pdata *ep); +char mdss_dp_gen_link_clk(struct mdss_panel_info *pinfo, char lane_cnt); #endif /* MDSS_DP_H */ diff --git a/drivers/video/fbdev/msm/mdss_dp_aux.c b/drivers/video/fbdev/msm/mdss_dp_aux.c index b51bf317fa15..ba03ca682f2f 100644 --- a/drivers/video/fbdev/msm/mdss_dp_aux.c +++ b/drivers/video/fbdev/msm/mdss_dp_aux.c @@ -484,6 +484,37 @@ void dp_extract_edid_feature(struct edp_edid *edid, char *buf) edid->dpm, edid->color_format); }; +char mdss_dp_gen_link_clk(struct mdss_panel_info *pinfo, char lane_cnt) +{ + const u32 encoding_factx10 = 8; + const u32 ln_to_link_ratio = 10; + u32 min_link_rate; + char calc_link_rate = 0; + + pr_debug("clk_rate=%llu, bpp= %d, lane_cnt=%d\n", + pinfo->clk_rate, pinfo->bpp, lane_cnt); + min_link_rate = (pinfo->clk_rate * 10) / + (lane_cnt * encoding_factx10); + min_link_rate = (min_link_rate * pinfo->bpp) + / (DP_LINK_RATE_MULTIPLIER); + min_link_rate /= ln_to_link_ratio; + + pr_debug("min_link_rate = %d\n", min_link_rate); + + if (min_link_rate <= DP_LINK_RATE_162) + calc_link_rate = DP_LINK_RATE_162; + else if (min_link_rate <= DP_LINK_RATE_270) + calc_link_rate = DP_LINK_RATE_270; + else if (min_link_rate <= DP_LINK_RATE_540) + calc_link_rate = DP_LINK_RATE_540; + else { + pr_err("link_rate = %d is unsupported\n", min_link_rate); + calc_link_rate = 0; + } + + return calc_link_rate; +} + void dp_extract_edid_detailed_timing_description(struct edp_edid *edid, char *buf) { |