diff --git a/drivers/video/omap2/displays/panel-taal.c b/drivers/video/omap2/displays/panel-taal.c index eb86cbae8c2a..2fc923de23cc 100644 --- a/drivers/video/omap2/displays/panel-taal.c +++ b/drivers/video/omap2/displays/panel-taal.c @@ -787,6 +787,7 @@ static int taal_probe(struct omap_dss_device *dssdev) dssdev->panel.timings.x_res = 864; dssdev->panel.timings.y_res = 480; + dssdev->panel.timings.pixel_clock = DIV_ROUND_UP(864 * 480 * 60, 1000); dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888; dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE | OMAP_DSS_DISPLAY_CAP_TEAR_ELIM; @@ -923,8 +924,10 @@ static int taal_power_on(struct omap_dss_device *dssdev) .mode = OMAP_DSS_DSI_CMD_MODE, .pixel_format = OMAP_DSS_DSI_FMT_RGB888, .timings = &dssdev->panel.timings, - .hs_clk = 216000000, - .lp_clk = 10000000, + .hs_clk_min = 150000000, + .hs_clk_max = 300000000, + .lp_clk_min = 7000000, + .lp_clk_max = 10000000, }; r = omapdss_dsi_configure_pins(dssdev, &td->pin_config); diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c index a4e0560c2799..de88e69ef0a2 100644 --- a/drivers/video/omap2/dss/dsi.c +++ b/drivers/video/omap2/dss/dsi.c @@ -255,6 +255,24 @@ struct dsi_isr_tables { struct dsi_isr_data isr_table_cio[DSI_MAX_NR_ISRS]; }; +struct dsi_clk_calc_ctx { + struct platform_device *dsidev; + + /* inputs */ + + const struct omap_dss_dsi_config *config; + + unsigned long req_pck_min, req_pck_nom, req_pck_max; + + /* outputs */ + + struct dsi_clock_info dsi_cinfo; + struct dispc_clock_info dispc_cinfo; + + struct omap_video_timings dispc_vm; + struct omap_dss_dsi_videomode_timings dsi_vm; +}; + struct dsi_data { struct platform_device *pdev; void __iomem *base; @@ -1201,6 +1219,25 @@ static unsigned long dsi_fclk_rate(struct platform_device *dsidev) return r; } +static int dsi_lp_clock_calc(struct dsi_clock_info *cinfo, + unsigned long lp_clk_min, unsigned long lp_clk_max) +{ + unsigned long dsi_fclk = cinfo->dsi_pll_hsdiv_dsi_clk; + unsigned lp_clk_div; + unsigned long lp_clk; + + lp_clk_div = DIV_ROUND_UP(dsi_fclk, lp_clk_max * 2); + lp_clk = dsi_fclk / 2 / lp_clk_div; + + if (lp_clk < lp_clk_min || lp_clk > lp_clk_max) + return -EINVAL; + + cinfo->lp_clk_div = lp_clk_div; + cinfo->lp_clk = lp_clk; + + return 0; +} + static int dsi_set_lp_clk_divisor(struct platform_device *dsidev) { struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev); @@ -1577,8 +1614,7 @@ found: return 0; } -static void dsi_pll_calc_dsi_fck(struct platform_device *dsidev, - struct dsi_clock_info *cinfo) +static void dsi_pll_calc_dsi_fck(struct dsi_clock_info *cinfo) { unsigned long max_dsi_fck; @@ -4369,7 +4405,7 @@ static int dsi_set_clocks(struct omap_dss_device *dssdev, goto err; /* Calculate PLL's DSI clock */ - dsi_pll_calc_dsi_fck(dsidev, &cinfo); + dsi_pll_calc_dsi_fck(&cinfo); /* Calculate PLL's DISPC clock and pck & lck divs */ pck = cinfo.clkin4ddr / 16 * (dsi->num_lanes_used - 1) * 8 / bpp; @@ -4693,13 +4729,6 @@ static int dsi_display_init_dispc(struct platform_device *dsidev, OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC); if (dsi->mode == OMAP_DSS_DSI_CMD_MODE) { - dsi->timings.hsw = 1; - dsi->timings.hfp = 1; - dsi->timings.hbp = 1; - dsi->timings.vsw = 1; - dsi->timings.vfp = 0; - dsi->timings.vbp = 0; - r = dss_mgr_register_framedone_handler(mgr, dsi_framedone_irq_callback, dsidev); if (r) { @@ -4941,24 +4970,526 @@ int omapdss_dsi_enable_te(struct omap_dss_device *dssdev, bool enable) } EXPORT_SYMBOL(omapdss_dsi_enable_te); +#ifdef PRINT_VERBOSE_VM_TIMINGS +static void print_dsi_vm(const char *str, + const struct omap_dss_dsi_videomode_timings *t) +{ + unsigned long byteclk = t->hsclk / 4; + int bl, wc, pps, tot; + + wc = DIV_ROUND_UP(t->hact * t->bitspp, 8); + pps = DIV_ROUND_UP(wc + 6, t->ndl); /* pixel packet size */ + bl = t->hss + t->hsa + t->hse + t->hbp + t->hfp; + tot = bl + pps; + +#define TO_DSI_T(x) ((u32)div64_u64((u64)x * 1000000000llu, byteclk)) + + pr_debug("%s bck %lu, %u/%u/%u/%u/%u/%u = %u+%u = %u, " + "%u/%u/%u/%u/%u/%u = %u + %u = %u\n", + str, + byteclk, + t->hss, t->hsa, t->hse, t->hbp, pps, t->hfp, + bl, pps, tot, + TO_DSI_T(t->hss), + TO_DSI_T(t->hsa), + TO_DSI_T(t->hse), + TO_DSI_T(t->hbp), + TO_DSI_T(pps), + TO_DSI_T(t->hfp), + + TO_DSI_T(bl), + TO_DSI_T(pps), + + TO_DSI_T(tot)); +#undef TO_DSI_T +} + +static void print_dispc_vm(const char *str, const struct omap_video_timings *t) +{ + unsigned long pck = t->pixel_clock * 1000; + int hact, bl, tot; + + hact = t->x_res; + bl = t->hsw + t->hbp + t->hfp; + tot = hact + bl; + +#define TO_DISPC_T(x) ((u32)div64_u64((u64)x * 1000000000llu, pck)) + + pr_debug("%s pck %lu, %u/%u/%u/%u = %u+%u = %u, " + "%u/%u/%u/%u = %u + %u = %u\n", + str, + pck, + t->hsw, t->hbp, hact, t->hfp, + bl, hact, tot, + TO_DISPC_T(t->hsw), + TO_DISPC_T(t->hbp), + TO_DISPC_T(hact), + TO_DISPC_T(t->hfp), + TO_DISPC_T(bl), + TO_DISPC_T(hact), + TO_DISPC_T(tot)); +#undef TO_DISPC_T +} + +/* note: this is not quite accurate */ +static void print_dsi_dispc_vm(const char *str, + const struct omap_dss_dsi_videomode_timings *t) +{ + struct omap_video_timings vm = { 0 }; + unsigned long byteclk = t->hsclk / 4; + unsigned long pck; + u64 dsi_tput; + int dsi_hact, dsi_htot; + + dsi_tput = (u64)byteclk * t->ndl * 8; + pck = (u32)div64_u64(dsi_tput, t->bitspp); + dsi_hact = DIV_ROUND_UP(DIV_ROUND_UP(t->hact * t->bitspp, 8) + 6, t->ndl); + dsi_htot = t->hss + t->hsa + t->hse + t->hbp + dsi_hact + t->hfp; + + vm.pixel_clock = pck / 1000; + vm.hsw = div64_u64((u64)(t->hsa + t->hse) * pck, byteclk); + vm.hbp = div64_u64((u64)t->hbp * pck, byteclk); + vm.hfp = div64_u64((u64)t->hfp * pck, byteclk); + vm.x_res = t->hact; + + print_dispc_vm(str, &vm); +} +#endif /* PRINT_VERBOSE_VM_TIMINGS */ + +static bool dsi_cm_calc_dispc_cb(int lckd, int pckd, unsigned long lck, + unsigned long pck, void *data) +{ + struct dsi_clk_calc_ctx *ctx = data; + struct omap_video_timings *t = &ctx->dispc_vm; + + ctx->dispc_cinfo.lck_div = lckd; + ctx->dispc_cinfo.pck_div = pckd; + ctx->dispc_cinfo.lck = lck; + ctx->dispc_cinfo.pck = pck; + + *t = *ctx->config->timings; + t->pixel_clock = pck / 1000; + t->x_res = ctx->config->timings->x_res; + t->y_res = ctx->config->timings->y_res; + t->hsw = t->hfp = t->hbp = t->vsw = 1; + t->vfp = t->vbp = 0; + + return true; +} + +static bool dsi_cm_calc_hsdiv_cb(int regm_dispc, unsigned long dispc, + void *data) +{ + struct dsi_clk_calc_ctx *ctx = data; + + ctx->dsi_cinfo.regm_dispc = regm_dispc; + ctx->dsi_cinfo.dsi_pll_hsdiv_dispc_clk = dispc; + + return dispc_div_calc(dispc, ctx->req_pck_min, ctx->req_pck_max, + dsi_cm_calc_dispc_cb, ctx); +} + +static bool dsi_cm_calc_pll_cb(int regn, int regm, unsigned long fint, + unsigned long pll, void *data) +{ + struct dsi_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->req_pck_min, + dsi_cm_calc_hsdiv_cb, ctx); +} + +static bool dsi_cm_calc(struct dsi_data *dsi, + const struct omap_dss_dsi_config *cfg, + struct dsi_clk_calc_ctx *ctx) +{ + unsigned long clkin; + int bitspp, ndl; + unsigned long pll_min, pll_max; + unsigned long pck, txbyteclk; + + clkin = clk_get_rate(dsi->sys_clk); + bitspp = dsi_get_pixel_size(cfg->pixel_format); + ndl = dsi->num_lanes_used - 1; + + /* + * Here we should calculate minimum txbyteclk to be able to send the + * frame in time, and also to handle TE. That's not very simple, though, + * especially as we go to LP between each pixel packet due to HW + * "feature". So let's just estimate very roughly and multiply by 1.5. + */ + pck = cfg->timings->pixel_clock * 1000; + pck = pck * 3 / 2; + txbyteclk = pck * bitspp / 8 / ndl; + + memset(ctx, 0, sizeof(*ctx)); + ctx->dsidev = dsi->pdev; + ctx->config = cfg; + ctx->req_pck_min = pck; + ctx->req_pck_nom = pck; + ctx->req_pck_max = pck * 3 / 2; + ctx->dsi_cinfo.clkin = clkin; + + pll_min = max(cfg->hs_clk_min * 4, txbyteclk * 4 * 4); + pll_max = cfg->hs_clk_max * 4; + + return dsi_pll_calc(dsi->pdev, clkin, + pll_min, pll_max, + dsi_cm_calc_pll_cb, ctx); +} + +static bool dsi_vm_calc_blanking(struct dsi_clk_calc_ctx *ctx) +{ + struct dsi_data *dsi = dsi_get_dsidrv_data(ctx->dsidev); + const struct omap_dss_dsi_config *cfg = ctx->config; + int bitspp = dsi_get_pixel_size(cfg->pixel_format); + int ndl = dsi->num_lanes_used - 1; + unsigned long hsclk = ctx->dsi_cinfo.clkin4ddr / 4; + unsigned long byteclk = hsclk / 4; + + unsigned long dispc_pck, req_pck_min, req_pck_nom, req_pck_max; + int xres; + int panel_htot, panel_hbl; /* pixels */ + int dispc_htot, dispc_hbl; /* pixels */ + int dsi_htot, dsi_hact, dsi_hbl, hss, hse; /* byteclks */ + int hfp, hsa, hbp; + const struct omap_video_timings *req_vm; + struct omap_video_timings *dispc_vm; + struct omap_dss_dsi_videomode_timings *dsi_vm; + u64 dsi_tput, dispc_tput; + + dsi_tput = (u64)byteclk * ndl * 8; + + req_vm = cfg->timings; + req_pck_min = ctx->req_pck_min; + req_pck_max = ctx->req_pck_max; + req_pck_nom = ctx->req_pck_nom; + + dispc_pck = ctx->dispc_cinfo.pck; + dispc_tput = (u64)dispc_pck * bitspp; + + xres = req_vm->x_res; + + panel_hbl = req_vm->hfp + req_vm->hbp + req_vm->hsw; + panel_htot = xres + panel_hbl; + + dsi_hact = DIV_ROUND_UP(DIV_ROUND_UP(xres * bitspp, 8) + 6, ndl); + + /* + * When there are no line buffers, DISPC and DSI must have the + * same tput. Otherwise DISPC tput needs to be higher than DSI's. + */ + if (dsi->line_buffer_size < xres * bitspp / 8) { + if (dispc_tput != dsi_tput) + return false; + } else { + if (dispc_tput < dsi_tput) + return false; + } + + /* DSI tput must be over the min requirement */ + if (dsi_tput < (u64)bitspp * req_pck_min) + return false; + + /* When non-burst mode, DSI tput must be below max requirement. */ + if (cfg->trans_mode != OMAP_DSS_DSI_BURST_MODE) { + if (dsi_tput > (u64)bitspp * req_pck_max) + return false; + } + + hss = DIV_ROUND_UP(4, ndl); + + if (cfg->trans_mode == OMAP_DSS_DSI_PULSE_MODE) { + if (ndl == 3 && req_vm->hsw == 0) + hse = 1; + else + hse = DIV_ROUND_UP(4, ndl); + } else { + hse = 0; + } + + /* DSI htot to match the panel's nominal pck */ + dsi_htot = div64_u64((u64)panel_htot * byteclk, req_pck_nom); + + /* fail if there would be no time for blanking */ + if (dsi_htot < hss + hse + dsi_hact) + return false; + + /* total DSI blanking needed to achieve panel's TL */ + dsi_hbl = dsi_htot - dsi_hact; + + /* DISPC htot to match the DSI TL */ + dispc_htot = div64_u64((u64)dsi_htot * dispc_pck, byteclk); + + /* verify that the DSI and DISPC TLs are the same */ + if ((u64)dsi_htot * dispc_pck != (u64)dispc_htot * byteclk) + return false; + + dispc_hbl = dispc_htot - xres; + + /* setup DSI videomode */ + + dsi_vm = &ctx->dsi_vm; + memset(dsi_vm, 0, sizeof(*dsi_vm)); + + dsi_vm->hsclk = hsclk; + + dsi_vm->ndl = ndl; + dsi_vm->bitspp = bitspp; + + if (cfg->trans_mode != OMAP_DSS_DSI_PULSE_MODE) { + hsa = 0; + } else if (ndl == 3 && req_vm->hsw == 0) { + hsa = 0; + } else { + hsa = div64_u64((u64)req_vm->hsw * byteclk, req_pck_nom); + hsa = max(hsa - hse, 1); + } + + hbp = div64_u64((u64)req_vm->hbp * byteclk, req_pck_nom); + hbp = max(hbp, 1); + + hfp = dsi_hbl - (hss + hsa + hse + hbp); + if (hfp < 1) { + int t; + /* we need to take cycles from hbp */ + + t = 1 - hfp; + hbp = max(hbp - t, 1); + hfp = dsi_hbl - (hss + hsa + hse + hbp); + + if (hfp < 1 && hsa > 0) { + /* we need to take cycles from hsa */ + t = 1 - hfp; + hsa = max(hsa - t, 1); + hfp = dsi_hbl - (hss + hsa + hse + hbp); + } + } + + if (hfp < 1) + return false; + + dsi_vm->hss = hss; + dsi_vm->hsa = hsa; + dsi_vm->hse = hse; + dsi_vm->hbp = hbp; + dsi_vm->hact = xres; + dsi_vm->hfp = hfp; + + dsi_vm->vsa = req_vm->vsw; + dsi_vm->vbp = req_vm->vbp; + dsi_vm->vact = req_vm->y_res; + dsi_vm->vfp = req_vm->vfp; + + dsi_vm->trans_mode = cfg->trans_mode; + + dsi_vm->blanking_mode = 0; + dsi_vm->hsa_blanking_mode = 1; + dsi_vm->hfp_blanking_mode = 1; + dsi_vm->hbp_blanking_mode = 1; + + dsi_vm->ddr_clk_always_on = cfg->ddr_clk_always_on; + dsi_vm->window_sync = 4; + + /* setup DISPC videomode */ + + dispc_vm = &ctx->dispc_vm; + *dispc_vm = *req_vm; + dispc_vm->pixel_clock = dispc_pck / 1000; + + if (cfg->trans_mode == OMAP_DSS_DSI_PULSE_MODE) { + hsa = div64_u64((u64)req_vm->hsw * dispc_pck, + req_pck_nom); + hsa = max(hsa, 1); + } else { + hsa = 1; + } + + hbp = div64_u64((u64)req_vm->hbp * dispc_pck, req_pck_nom); + hbp = max(hbp, 1); + + hfp = dispc_hbl - hsa - hbp; + if (hfp < 1) { + int t; + /* we need to take cycles from hbp */ + + t = 1 - hfp; + hbp = max(hbp - t, 1); + hfp = dispc_hbl - hsa - hbp; + + if (hfp < 1) { + /* we need to take cycles from hsa */ + t = 1 - hfp; + hsa = max(hsa - t, 1); + hfp = dispc_hbl - hsa - hbp; + } + } + + if (hfp < 1) + return false; + + dispc_vm->hfp = hfp; + dispc_vm->hsw = hsa; + dispc_vm->hbp = hbp; + + return true; +} + + +static bool dsi_vm_calc_dispc_cb(int lckd, int pckd, unsigned long lck, + unsigned long pck, void *data) +{ + struct dsi_clk_calc_ctx *ctx = data; + + ctx->dispc_cinfo.lck_div = lckd; + ctx->dispc_cinfo.pck_div = pckd; + ctx->dispc_cinfo.lck = lck; + ctx->dispc_cinfo.pck = pck; + + if (dsi_vm_calc_blanking(ctx) == false) + return false; + +#ifdef PRINT_VERBOSE_VM_TIMINGS + print_dispc_vm("dispc", &ctx->dispc_vm); + print_dsi_vm("dsi ", &ctx->dsi_vm); + print_dispc_vm("req ", ctx->config->timings); + print_dsi_dispc_vm("act ", &ctx->dsi_vm); +#endif + + return true; +} + +static bool dsi_vm_calc_hsdiv_cb(int regm_dispc, unsigned long dispc, + void *data) +{ + struct dsi_clk_calc_ctx *ctx = data; + unsigned long pck_max; + + ctx->dsi_cinfo.regm_dispc = regm_dispc; + ctx->dsi_cinfo.dsi_pll_hsdiv_dispc_clk = dispc; + + /* + * In burst mode we can let the dispc pck be arbitrarily high, but it + * limits our scaling abilities. So for now, don't aim too high. + */ + + if (ctx->config->trans_mode == OMAP_DSS_DSI_BURST_MODE) + pck_max = ctx->req_pck_max + 10000000; + else + pck_max = ctx->req_pck_max; + + return dispc_div_calc(dispc, ctx->req_pck_min, pck_max, + dsi_vm_calc_dispc_cb, ctx); +} + +static bool dsi_vm_calc_pll_cb(int regn, int regm, unsigned long fint, + unsigned long pll, void *data) +{ + struct dsi_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->req_pck_min, + dsi_vm_calc_hsdiv_cb, ctx); +} + +static bool dsi_vm_calc(struct dsi_data *dsi, + const struct omap_dss_dsi_config *cfg, + struct dsi_clk_calc_ctx *ctx) +{ + const struct omap_video_timings *t = cfg->timings; + unsigned long clkin; + unsigned long pll_min; + unsigned long pll_max; + int ndl = dsi->num_lanes_used - 1; + int bitspp = dsi_get_pixel_size(cfg->pixel_format); + unsigned long byteclk_min; + + clkin = clk_get_rate(dsi->sys_clk); + + memset(ctx, 0, sizeof(*ctx)); + ctx->dsidev = dsi->pdev; + ctx->config = cfg; + + ctx->dsi_cinfo.clkin = clkin; + + /* these limits should come from the panel driver */ + ctx->req_pck_min = t->pixel_clock * 1000 - 1000; + ctx->req_pck_nom = t->pixel_clock * 1000; + ctx->req_pck_max = t->pixel_clock * 1000 + 1000; + + byteclk_min = div64_u64((u64)ctx->req_pck_min * bitspp, ndl * 8); + pll_min = max(cfg->hs_clk_min * 4, byteclk_min * 4 * 4); + + if (cfg->trans_mode == OMAP_DSS_DSI_BURST_MODE) { + pll_max = cfg->hs_clk_max * 4; + } else { + unsigned long byteclk_max; + byteclk_max = div64_u64((u64)ctx->req_pck_max * bitspp, + ndl * 8); + + pll_max = byteclk_max * 4 * 4; + } + + return dsi_pll_calc(dsi->pdev, clkin, + pll_min, pll_max, + dsi_vm_calc_pll_cb, ctx); +} + int omapdss_dsi_set_config(struct omap_dss_device *dssdev, const struct omap_dss_dsi_config *config) { struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev); struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev); + struct dsi_clk_calc_ctx ctx; + bool ok; + int r; mutex_lock(&dsi->lock); - dsi->timings = *config->timings; - dsi->vm_timings = *config->vm_timings; dsi->pix_fmt = config->pixel_format; dsi->mode = config->mode; - dsi_set_clocks(dssdev, config->hs_clk, config->lp_clk); + if (config->mode == OMAP_DSS_DSI_VIDEO_MODE) + ok = dsi_vm_calc(dsi, config, &ctx); + else + ok = dsi_cm_calc(dsi, config, &ctx); + + if (!ok) { + DSSERR("failed to find suitable DSI clock settings\n"); + r = -EINVAL; + goto err; + } + + dsi_pll_calc_dsi_fck(&ctx.dsi_cinfo); + + r = dsi_lp_clock_calc(&ctx.dsi_cinfo, config->lp_clk_min, + config->lp_clk_max); + if (r) { + DSSERR("failed to find suitable DSI LP clock settings\n"); + goto err; + } + + dsi->user_dsi_cinfo = ctx.dsi_cinfo; + dsi->user_dispc_cinfo = ctx.dispc_cinfo; + + dsi->timings = ctx.dispc_vm; + dsi->vm_timings = ctx.dsi_vm; mutex_unlock(&dsi->lock); return 0; +err: + mutex_unlock(&dsi->lock); + + return r; } EXPORT_SYMBOL(omapdss_dsi_set_config); diff --git a/include/video/omapdss.h b/include/video/omapdss.h index 7f774c5f8b6b..8821d933d9fd 100644 --- a/include/video/omapdss.h +++ b/include/video/omapdss.h @@ -267,9 +267,21 @@ enum omap_dss_dsi_trans_mode { }; struct omap_dss_dsi_videomode_timings { + unsigned long hsclk; + + unsigned ndl; + unsigned bitspp; + + /* pixels */ + u16 hact; + /* lines */ + u16 vact; + /* DSI video mode blanking data */ /* Unit: byte clock cycles */ + u16 hss; u16 hsa; + u16 hse; u16 hfp; u16 hbp; /* Unit: line clocks */ @@ -293,10 +305,12 @@ struct omap_dss_dsi_config { enum omap_dss_dsi_mode mode; enum omap_dss_dsi_pixel_format pixel_format; const struct omap_video_timings *timings; - const struct omap_dss_dsi_videomode_timings *vm_timings; - unsigned long hs_clk; - unsigned long lp_clk; + unsigned long hs_clk_min, hs_clk_max; + unsigned long lp_clk_min, lp_clk_max; + + bool ddr_clk_always_on; + enum omap_dss_dsi_trans_mode trans_mode; }; void dsi_bus_lock(struct omap_dss_device *dssdev);