/* * linux/drivers/video/omap2/dss/sdi.c * * Copyright (C) 2009 Nokia Corporation * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. */ #define DSS_SUBSYS_NAME "SDI" #include <linux/kernel.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/regulator/consumer.h> #include <linux/export.h> #include <linux/platform_device.h> #include <linux/string.h> #include <linux/of.h> #include <video/omapdss.h> #include "dss.h" static struct { struct platform_device *pdev; bool update_enabled; struct regulator *vdds_sdi_reg; struct dss_lcd_mgr_config mgr_config; struct omap_video_timings timings; int datapairs; struct omap_dss_device output; bool port_initialized; } sdi; struct sdi_clk_calc_ctx { unsigned long pck_min, pck_max; unsigned long fck; 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 sdi_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; return true; } static bool dpi_calc_dss_cb(unsigned long fck, void *data) { struct sdi_clk_calc_ctx *ctx = data; ctx->fck = fck; return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max, dpi_calc_dispc_cb, ctx); } static int sdi_calc_clock_div(unsigned long pclk, unsigned long *fck, struct dispc_clock_info *dispc_cinfo) { int i; struct sdi_clk_calc_ctx ctx; /* * DSS fclk 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 (pclk > 1000 * i * i * i) ctx.pck_min = max(pclk - 1000 * i * i * i, 0lu); else ctx.pck_min = 0; ctx.pck_max = pclk + 1000 * i * i * i; ok = dss_div_calc(pclk, ctx.pck_min, dpi_calc_dss_cb, &ctx); if (ok) { *fck = ctx.fck; *dispc_cinfo = ctx.dispc_cinfo; return 0; } } return -EINVAL; } static void sdi_config_lcd_manager(struct omap_dss_device *dssdev) { struct omap_overlay_manager *mgr = sdi.output.manager; sdi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS; sdi.mgr_config.stallmode = false; sdi.mgr_config.fifohandcheck = false; sdi.mgr_config.video_port_width = 24; sdi.mgr_config.lcden_sig_polarity = 1; dss_mgr_set_lcd_config(mgr, &sdi.mgr_config); } static int sdi_display_enable(struct omap_dss_device *dssdev) { struct omap_dss_device *out = &sdi.output; struct omap_video_timings *t = &sdi.timings; unsigned long fck; struct dispc_clock_info dispc_cinfo; unsigned long pck; int r; if (out == NULL || out->manager == NULL) { DSSERR("failed to enable display: no output/manager\n"); return -ENODEV; } r = regulator_enable(sdi.vdds_sdi_reg); if (r) goto err_reg_enable; r = dispc_runtime_get(); if (r) goto err_get_dispc; /* 15.5.9.1.2 */ t->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE; t->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE; r = sdi_calc_clock_div(t->pixelclock, &fck, &dispc_cinfo); if (r) goto err_calc_clock_div; sdi.mgr_config.clock_info = dispc_cinfo; pck = fck / dispc_cinfo.lck_div / dispc_cinfo.pck_div; if (pck != t->pixelclock) { DSSWARN("Could not find exact pixel clock. Requested %d Hz, got %lu Hz\n", t->pixelclock, pck); t->pixelclock = pck; } dss_mgr_set_timings(out->manager, t); r = dss_set_fck_rate(fck); if (r) goto err_set_dss_clock_div; sdi_config_lcd_manager(dssdev); /* * LCLK and PCLK divisors are located in shadow registers, and we * normally write them to DISPC registers when enabling the output. * However, SDI uses pck-free as source clock for its PLL, and pck-free * is affected by the divisors. And as we need the PLL before enabling * the output, we need to write the divisors early. * * It seems just writing to the DISPC register is enough, and we don't * need to care about the shadow register mechanism for pck-free. The * exact reason for this is unknown. */ dispc_mgr_set_clock_div(out->manager->id, &sdi.mgr_config.clock_info); dss_sdi_init(sdi.datapairs); r = dss_sdi_enable(); if (r) goto err_sdi_enable; mdelay(2); r = dss_mgr_enable(out->manager); if (r) goto err_mgr_enable; return 0; err_mgr_enable: dss_sdi_disable(); err_sdi_enable: err_set_dss_clock_div: err_calc_clock_div: dispc_runtime_put(); err_get_dispc: regulator_disable(sdi.vdds_sdi_reg); err_reg_enable: return r; } static void sdi_display_disable(struct omap_dss_device *dssdev) { struct omap_overlay_manager *mgr = sdi.output.manager; dss_mgr_disable(mgr); dss_sdi_disable(); dispc_runtime_put(); regulator_disable(sdi.vdds_sdi_reg); } static void sdi_set_timings(struct omap_dss_device *dssdev, struct omap_video_timings *timings) { sdi.timings = *timings; } static void sdi_get_timings(struct omap_dss_device *dssdev, struct omap_video_timings *timings) { *timings = sdi.timings; } static int sdi_check_timings(struct omap_dss_device *dssdev, struct omap_video_timings *timings) { struct omap_overlay_manager *mgr = sdi.output.manager; if (mgr && !dispc_mgr_timings_ok(mgr->id, timings)) return -EINVAL; if (timings->pixelclock == 0) return -EINVAL; return 0; } static void sdi_set_datapairs(struct omap_dss_device *dssdev, int datapairs) { sdi.datapairs = datapairs; } static int sdi_init_regulator(void) { struct regulator *vdds_sdi; if (sdi.vdds_sdi_reg) return 0; vdds_sdi = devm_regulator_get(&sdi.pdev->dev, "vdds_sdi"); if (IS_ERR(vdds_sdi)) { if (PTR_ERR(vdds_sdi) != -EPROBE_DEFER) DSSERR("can't get VDDS_SDI regulator\n"); return PTR_ERR(vdds_sdi); } sdi.vdds_sdi_reg = vdds_sdi; return 0; } static int sdi_connect(struct omap_dss_device *dssdev, struct omap_dss_device *dst) { struct omap_overlay_manager *mgr; int r; r = sdi_init_regulator(); if (r) return r; mgr = omap_dss_get_overlay_manager(dssdev->dispc_channel); if (!mgr) return -ENODEV; r = dss_mgr_connect(mgr, dssdev); if (r) return r; r = omapdss_output_set_device(dssdev, dst); if (r) { DSSERR("failed to connect output to new device: %s\n", dst->name); dss_mgr_disconnect(mgr, dssdev); return r; } return 0; } static void sdi_disconnect(struct omap_dss_device *dssdev, struct omap_dss_device *dst) { WARN_ON(dst != dssdev->dst); if (dst != dssdev->dst) return; omapdss_output_unset_device(dssdev); if (dssdev->manager) dss_mgr_disconnect(dssdev->manager, dssdev); } static const struct omapdss_sdi_ops sdi_ops = { .connect = sdi_connect, .disconnect = sdi_disconnect, .enable = sdi_display_enable, .disable = sdi_display_disable, .check_timings = sdi_check_timings, .set_timings = sdi_set_timings, .get_timings = sdi_get_timings, .set_datapairs = sdi_set_datapairs, }; static void sdi_init_output(struct platform_device *pdev) { struct omap_dss_device *out = &sdi.output; out->dev = &pdev->dev; out->id = OMAP_DSS_OUTPUT_SDI; out->output_type = OMAP_DISPLAY_TYPE_SDI; out->name = "sdi.0"; out->dispc_channel = OMAP_DSS_CHANNEL_LCD; out->ops.sdi = &sdi_ops; out->owner = THIS_MODULE; omapdss_register_output(out); } static void __exit sdi_uninit_output(struct platform_device *pdev) { struct omap_dss_device *out = &sdi.output; omapdss_unregister_output(out); } static int omap_sdi_probe(struct platform_device *pdev) { sdi.pdev = pdev; sdi_init_output(pdev); return 0; } static int __exit omap_sdi_remove(struct platform_device *pdev) { sdi_uninit_output(pdev); return 0; } static struct platform_driver omap_sdi_driver = { .probe = omap_sdi_probe, .remove = __exit_p(omap_sdi_remove), .driver = { .name = "omapdss_sdi", .owner = THIS_MODULE, .suppress_bind_attrs = true, }, }; int __init sdi_init_platform_driver(void) { return platform_driver_register(&omap_sdi_driver); } void __exit sdi_uninit_platform_driver(void) { platform_driver_unregister(&omap_sdi_driver); } int __init sdi_init_port(struct platform_device *pdev, struct device_node *port) { struct device_node *ep; u32 datapairs; int r; ep = omapdss_of_get_next_endpoint(port, NULL); if (!ep) return 0; r = of_property_read_u32(ep, "datapairs", &datapairs); if (r) { DSSERR("failed to parse datapairs\n"); goto err_datapairs; } sdi.datapairs = datapairs; of_node_put(ep); sdi.pdev = pdev; sdi_init_output(pdev); sdi.port_initialized = true; return 0; err_datapairs: of_node_put(ep); return r; } void __exit sdi_uninit_port(struct device_node *port) { if (!sdi.port_initialized) return; sdi_uninit_output(sdi.pdev); }