diff options
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/omap2/dss/dsi.c | 144 |
1 files changed, 113 insertions, 31 deletions
diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c index 8d815e39e45d..8d47fb7c4b8f 100644 --- a/drivers/video/omap2/dss/dsi.c +++ b/drivers/video/omap2/dss/dsi.c @@ -1454,26 +1454,17 @@ found: } static int dsi_pll_calc_ddrfreq(struct platform_device *dsidev, - unsigned long req_clk, struct dsi_clock_info *cinfo) + unsigned long req_clkin4ddr, struct dsi_clock_info *cinfo) { struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev); struct dsi_clock_info cur, best; - unsigned long dss_sys_clk, max_dss_fck, max_dsi_fck; - unsigned long req_clkin4ddr; DSSDBG("dsi_pll_calc_ddrfreq\n"); - dss_sys_clk = clk_get_rate(dsi->sys_clk); - - max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK); - max_dsi_fck = dss_feat_get_param_max(FEAT_PARAM_DSI_FCK); - memset(&best, 0, sizeof(best)); memset(&cur, 0, sizeof(cur)); - cur.clkin = dss_sys_clk; - - req_clkin4ddr = req_clk * 4; + cur.clkin = clk_get_rate(dsi->sys_clk); for (cur.regn = 1; cur.regn < dsi->regn_max; ++cur.regn) { cur.fint = cur.clkin / cur.regn; @@ -1503,18 +1494,107 @@ static int dsi_pll_calc_ddrfreq(struct platform_device *dsidev, } } found: - best.regm_dispc = DIV_ROUND_UP(best.clkin4ddr, max_dss_fck); - best.dsi_pll_hsdiv_dispc_clk = best.clkin4ddr / best.regm_dispc; - - best.regm_dsi = DIV_ROUND_UP(best.clkin4ddr, max_dsi_fck); - best.dsi_pll_hsdiv_dsi_clk = best.clkin4ddr / best.regm_dsi; - if (cinfo) *cinfo = best; return 0; } +static void dsi_pll_calc_dsi_fck(struct platform_device *dsidev, + struct dsi_clock_info *cinfo) +{ + unsigned long max_dsi_fck; + + max_dsi_fck = dss_feat_get_param_max(FEAT_PARAM_DSI_FCK); + + cinfo->regm_dsi = DIV_ROUND_UP(cinfo->clkin4ddr, max_dsi_fck); + cinfo->dsi_pll_hsdiv_dsi_clk = cinfo->clkin4ddr / cinfo->regm_dsi; +} + +static int dsi_pll_calc_dispc_fck(struct platform_device *dsidev, + unsigned long req_pck, struct dsi_clock_info *cinfo, + struct dispc_clock_info *dispc_cinfo) +{ + struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev); + unsigned regm_dispc, best_regm_dispc; + unsigned long dispc_clk, best_dispc_clk; + int min_fck_per_pck; + unsigned long max_dss_fck; + struct dispc_clock_info best_dispc; + bool match; + + max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK); + + min_fck_per_pck = CONFIG_OMAP2_DSS_MIN_FCK_PER_PCK; + + if (min_fck_per_pck && + req_pck * min_fck_per_pck > max_dss_fck) { + DSSERR("Requested pixel clock not possible with the current " + "OMAP2_DSS_MIN_FCK_PER_PCK setting. Turning " + "the constraint off.\n"); + min_fck_per_pck = 0; + } + +retry: + best_regm_dispc = 0; + best_dispc_clk = 0; + memset(&best_dispc, 0, sizeof(best_dispc)); + match = false; + + for (regm_dispc = 1; regm_dispc < dsi->regm_dispc_max; ++regm_dispc) { + struct dispc_clock_info cur_dispc; + + dispc_clk = cinfo->clkin4ddr / regm_dispc; + + /* this will narrow down the search a bit, + * but still give pixclocks below what was + * requested */ + if (dispc_clk < req_pck) + break; + + if (dispc_clk > max_dss_fck) + continue; + + if (min_fck_per_pck && dispc_clk < req_pck * min_fck_per_pck) + continue; + + match = true; + + dispc_find_clk_divs(req_pck, dispc_clk, &cur_dispc); + + if (abs(cur_dispc.pck - req_pck) < + abs(best_dispc.pck - req_pck)) { + best_regm_dispc = regm_dispc; + best_dispc_clk = dispc_clk; + best_dispc = cur_dispc; + + if (cur_dispc.pck == req_pck) + goto found; + } + } + + if (!match) { + if (min_fck_per_pck) { + DSSERR("Could not find suitable clock settings.\n" + "Turning FCK/PCK constraint off and" + "trying again.\n"); + min_fck_per_pck = 0; + goto retry; + } + + DSSERR("Could not find suitable clock settings.\n"); + + return -EINVAL; + } +found: + cinfo->regm_dispc = best_regm_dispc; + cinfo->dsi_pll_hsdiv_dispc_clk = best_dispc_clk; + + *dispc_cinfo = best_dispc; + + return 0; +} + int dsi_pll_set_clock_div(struct platform_device *dsidev, struct dsi_clock_info *cinfo) { @@ -4188,33 +4268,35 @@ int omapdss_dsi_set_clocks(struct omap_dss_device *dssdev, mutex_lock(&dsi->lock); - r = dsi_pll_calc_ddrfreq(dsidev, ddr_clk, &cinfo); + /* Calculate PLL output clock */ + r = dsi_pll_calc_ddrfreq(dsidev, ddr_clk * 4, &cinfo); if (r) goto err; - dssdev->clocks.dsi.regn = cinfo.regn; - dssdev->clocks.dsi.regm = cinfo.regm; - dssdev->clocks.dsi.regm_dispc = cinfo.regm_dispc; - dssdev->clocks.dsi.regm_dsi = cinfo.regm_dsi; + /* Calculate PLL's DSI clock */ + dsi_pll_calc_dsi_fck(dsidev, &cinfo); + /* Calculate PLL's DISPC clock and pck & lck divs */ + pck = cinfo.clkin4ddr / 16 * (dsi->num_lanes_used - 1) * 8 / bpp; + DSSDBG("finding dispc dividers for pck %lu\n", pck); + r = dsi_pll_calc_dispc_fck(dsidev, pck, &cinfo, &dispc_cinfo); + if (r) + goto err; + /* Calculate LP clock */ dsi_fclk = cinfo.dsi_pll_hsdiv_dsi_clk; lp_clk_div = DIV_ROUND_UP(dsi_fclk, lp_clk * 2); - dssdev->clocks.dsi.lp_clk_div = lp_clk_div; - - /* pck = TxByteClkHS * datalanes * 8 / bitsperpixel */ - - pck = cinfo.clkin4ddr / 16 * (dsi->num_lanes_used - 1) * 8 / bpp; - - DSSDBG("finding dispc dividers for pck %lu\n", pck); + dssdev->clocks.dsi.regn = cinfo.regn; + dssdev->clocks.dsi.regm = cinfo.regm; + dssdev->clocks.dsi.regm_dispc = cinfo.regm_dispc; + dssdev->clocks.dsi.regm_dsi = cinfo.regm_dsi; - dispc_find_clk_divs(pck, cinfo.dsi_pll_hsdiv_dispc_clk, &dispc_cinfo); + dssdev->clocks.dsi.lp_clk_div = lp_clk_div; dssdev->clocks.dispc.channel.lck_div = dispc_cinfo.lck_div; dssdev->clocks.dispc.channel.pck_div = dispc_cinfo.pck_div; - dssdev->clocks.dispc.dispc_fclk_src = OMAP_DSS_CLK_SRC_FCK; dssdev->clocks.dispc.channel.lcd_clk_src = |