From 100c826235793345efe06b3558cc9d36166b1e26 Mon Sep 17 00:00:00 2001 From: Tomi Valkeinen Date: Tue, 5 Mar 2013 17:07:16 +0200 Subject: [PATCH] OMAPDSS: DPI: use new clock calculation code Use the new clock calculation code in the DPI driver. Signed-off-by: Tomi Valkeinen --- drivers/video/omap2/dss/dpi.c | 212 +++++++++++++++++++++++++++------- 1 file changed, 172 insertions(+), 40 deletions(-) diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c index c8c7776c8cfa..abe1a4e23c36 100644 --- a/drivers/video/omap2/dss/dpi.c +++ b/drivers/video/omap2/dss/dpi.c @@ -105,31 +105,170 @@ static enum omap_dss_clk_source dpi_get_alt_clk_src(enum omap_channel channel) } } +struct dpi_clk_calc_ctx { + struct platform_device *dsidev; + + /* inputs */ + + unsigned long pck_min, pck_max; + + /* outputs */ + + struct dsi_clock_info dsi_cinfo; + struct dss_clock_info dss_cinfo; + struct dispc_clock_info dispc_cinfo; +}; + +static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck, + unsigned long pck, void *data) +{ + struct dpi_clk_calc_ctx *ctx = data; + + /* + * Odd dividers give us uneven duty cycle, causing problem when level + * shifted. So skip all odd dividers when the pixel clock is on the + * higher side. + */ + if (ctx->pck_min >= 1000000) { + if (lckd > 1 && lckd % 2 != 0) + return false; + + if (pckd > 1 && pckd % 2 != 0) + return false; + } + + ctx->dispc_cinfo.lck_div = lckd; + ctx->dispc_cinfo.pck_div = pckd; + ctx->dispc_cinfo.lck = lck; + ctx->dispc_cinfo.pck = pck; + + return true; +} + + +static bool dpi_calc_hsdiv_cb(int regm_dispc, unsigned long dispc, + void *data) +{ + struct dpi_clk_calc_ctx *ctx = data; + + /* + * Odd dividers give us uneven duty cycle, causing problem when level + * shifted. So skip all odd dividers when the pixel clock is on the + * higher side. + */ + if (regm_dispc > 1 && regm_dispc % 2 != 0 && ctx->pck_min >= 1000000) + return false; + + ctx->dsi_cinfo.regm_dispc = regm_dispc; + ctx->dsi_cinfo.dsi_pll_hsdiv_dispc_clk = dispc; + + return dispc_div_calc(dispc, ctx->pck_min, ctx->pck_max, + dpi_calc_dispc_cb, ctx); +} + + +static bool dpi_calc_pll_cb(int regn, int regm, unsigned long fint, + unsigned long pll, + void *data) +{ + struct dpi_clk_calc_ctx *ctx = data; + + ctx->dsi_cinfo.regn = regn; + ctx->dsi_cinfo.regm = regm; + ctx->dsi_cinfo.fint = fint; + ctx->dsi_cinfo.clkin4ddr = pll; + + return dsi_hsdiv_calc(ctx->dsidev, pll, ctx->pck_min, + dpi_calc_hsdiv_cb, ctx); +} + +static bool dpi_calc_dss_cb(int fckd, unsigned long fck, void *data) +{ + struct dpi_clk_calc_ctx *ctx = data; + + ctx->dss_cinfo.fck = fck; + ctx->dss_cinfo.fck_div = fckd; + + return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max, + dpi_calc_dispc_cb, ctx); +} + +static bool dpi_dsi_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx) +{ + unsigned long clkin; + unsigned long pll_min, pll_max; + + clkin = dsi_get_pll_clkin(dpi.dsidev); + + memset(ctx, 0, sizeof(*ctx)); + ctx->dsidev = dpi.dsidev; + ctx->pck_min = pck - 1000; + ctx->pck_max = pck + 1000; + ctx->dsi_cinfo.clkin = clkin; + + pll_min = 0; + pll_max = 0; + + return dsi_pll_calc(dpi.dsidev, clkin, + pll_min, pll_max, + dpi_calc_pll_cb, ctx); +} + +static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx) +{ + int i; + + /* + * DSS fck gives us very few possibilities, so finding a good pixel + * clock may not be possible. We try multiple times to find the clock, + * each time widening the pixel clock range we look for, up to + * +/- 1MHz. + */ + + for (i = 0; i < 10; ++i) { + bool ok; + + memset(ctx, 0, sizeof(*ctx)); + if (pck > 1000 * i * i * i) + ctx->pck_min = max(pck - 1000 * i * i * i, 0lu); + else + ctx->pck_min = 0; + ctx->pck_max = pck + 1000 * i * i * i; + + ok = dss_div_calc(ctx->pck_min, dpi_calc_dss_cb, ctx); + if (ok) + return ok; + } + + return false; +} + + + static int dpi_set_dsi_clk(enum omap_channel channel, unsigned long pck_req, unsigned long *fck, int *lck_div, int *pck_div) { - struct dsi_clock_info dsi_cinfo; - struct dispc_clock_info dispc_cinfo; + struct dpi_clk_calc_ctx ctx; int r; + bool ok; - r = dsi_pll_calc_clock_div_pck(dpi.dsidev, pck_req, &dsi_cinfo, - &dispc_cinfo); - if (r) - return r; + ok = dpi_dsi_clk_calc(pck_req, &ctx); + if (!ok) + return -EINVAL; - r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo); + r = dsi_pll_set_clock_div(dpi.dsidev, &ctx.dsi_cinfo); if (r) return r; dss_select_lcd_clk_source(channel, dpi_get_alt_clk_src(channel)); - dpi.mgr_config.clock_info = dispc_cinfo; + dpi.mgr_config.clock_info = ctx.dispc_cinfo; - *fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk; - *lck_div = dispc_cinfo.lck_div; - *pck_div = dispc_cinfo.pck_div; + *fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk; + *lck_div = ctx.dispc_cinfo.lck_div; + *pck_div = ctx.dispc_cinfo.pck_div; return 0; } @@ -137,23 +276,23 @@ static int dpi_set_dsi_clk(enum omap_channel channel, static int dpi_set_dispc_clk(unsigned long pck_req, unsigned long *fck, int *lck_div, int *pck_div) { - struct dss_clock_info dss_cinfo; - struct dispc_clock_info dispc_cinfo; + struct dpi_clk_calc_ctx ctx; int r; + bool ok; - r = dss_calc_clock_div(pck_req, &dss_cinfo, &dispc_cinfo); - if (r) - return r; + ok = dpi_dss_clk_calc(pck_req, &ctx); + if (!ok) + return -EINVAL; - r = dss_set_clock_div(&dss_cinfo); + r = dss_set_clock_div(&ctx.dss_cinfo); if (r) return r; - dpi.mgr_config.clock_info = dispc_cinfo; + dpi.mgr_config.clock_info = ctx.dispc_cinfo; - *fck = dss_cinfo.fck; - *lck_div = dispc_cinfo.lck_div; - *pck_div = dispc_cinfo.pck_div; + *fck = ctx.dss_cinfo.fck; + *lck_div = ctx.dispc_cinfo.lck_div; + *pck_div = ctx.dispc_cinfo.pck_div; return 0; } @@ -333,12 +472,12 @@ EXPORT_SYMBOL(omapdss_dpi_set_timings); int dpi_check_timings(struct omap_dss_device *dssdev, struct omap_video_timings *timings) { - int r; struct omap_overlay_manager *mgr = dpi.output.manager; int lck_div, pck_div; unsigned long fck; unsigned long pck; - struct dispc_clock_info dispc_cinfo; + struct dpi_clk_calc_ctx ctx; + bool ok; if (mgr && !dispc_mgr_timings_ok(mgr->id, timings)) return -EINVAL; @@ -347,28 +486,21 @@ int dpi_check_timings(struct omap_dss_device *dssdev, return -EINVAL; if (dpi.dsidev) { - struct dsi_clock_info dsi_cinfo; - r = dsi_pll_calc_clock_div_pck(dpi.dsidev, - timings->pixel_clock * 1000, - &dsi_cinfo, &dispc_cinfo); + ok = dpi_dsi_clk_calc(timings->pixel_clock * 1000, &ctx); + if (!ok) + return -EINVAL; - if (r) - return r; - - fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk; + fck = ctx.dsi_cinfo.dsi_pll_hsdiv_dispc_clk; } else { - struct dss_clock_info dss_cinfo; - r = dss_calc_clock_div(timings->pixel_clock * 1000, - &dss_cinfo, &dispc_cinfo); - - if (r) - return r; + ok = dpi_dss_clk_calc(timings->pixel_clock * 1000, &ctx); + if (!ok) + return -EINVAL; - fck = dss_cinfo.fck; + fck = ctx.dss_cinfo.fck; } - lck_div = dispc_cinfo.lck_div; - pck_div = dispc_cinfo.pck_div; + lck_div = ctx.dispc_cinfo.lck_div; + pck_div = ctx.dispc_cinfo.pck_div; pck = fck / lck_div / pck_div / 1000; -- 2.30.2