2 * linux/drivers/video/omap2/dss/dpi.c
4 * Copyright (C) 2009 Nokia Corporation
7 * Some code and ideas taken from drivers/video/omap/ driver
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 * You should have received a copy of the GNU General Public License along with
20 * this program. If not, see <http://www.gnu.org/licenses/>.
23 #define DSS_SUBSYS_NAME "DPI"
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/export.h>
28 #include <linux/err.h>
29 #include <linux/errno.h>
30 #include <linux/platform_device.h>
31 #include <linux/regulator/consumer.h>
32 #include <linux/string.h>
34 #include <linux/clk.h>
35 #include <linux/sys_soc.h>
41 struct platform_device *pdev;
42 enum dss_model dss_model;
44 struct regulator *vdds_dsi_reg;
45 enum dss_clk_source clk_src;
51 struct dss_lcd_mgr_config mgr_config;
54 struct omap_dss_device output;
56 bool port_initialized;
59 static struct dpi_data *dpi_get_data_from_dssdev(struct omap_dss_device *dssdev)
61 return container_of(dssdev, struct dpi_data, output);
64 static enum dss_clk_source dpi_get_clk_src_dra7xx(enum omap_channel channel)
67 * Possible clock sources:
68 * LCD1: FCK/PLL1_1/HDMI_PLL
69 * LCD2: FCK/PLL1_3/HDMI_PLL (DRA74x: PLL2_3)
70 * LCD3: FCK/PLL1_3/HDMI_PLL (DRA74x: PLL2_1)
74 case OMAP_DSS_CHANNEL_LCD:
76 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL1_1))
77 return DSS_CLK_SRC_PLL1_1;
80 case OMAP_DSS_CHANNEL_LCD2:
82 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL1_3))
83 return DSS_CLK_SRC_PLL1_3;
84 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL2_3))
85 return DSS_CLK_SRC_PLL2_3;
88 case OMAP_DSS_CHANNEL_LCD3:
90 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL2_1))
91 return DSS_CLK_SRC_PLL2_1;
92 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL1_3))
93 return DSS_CLK_SRC_PLL1_3;
100 return DSS_CLK_SRC_FCK;
103 static enum dss_clk_source dpi_get_clk_src(struct dpi_data *dpi)
105 enum omap_channel channel = dpi->output.dispc_channel;
108 * XXX we can't currently use DSI PLL for DPI with OMAP3, as the DSI PLL
109 * would also be used for DISPC fclk. Meaning, when the DPI output is
110 * disabled, DISPC clock will be disabled, and TV out will stop.
112 switch (dpi->dss_model) {
113 case DSS_MODEL_OMAP2:
114 case DSS_MODEL_OMAP3:
115 return DSS_CLK_SRC_FCK;
117 case DSS_MODEL_OMAP4:
119 case OMAP_DSS_CHANNEL_LCD:
120 return DSS_CLK_SRC_PLL1_1;
121 case OMAP_DSS_CHANNEL_LCD2:
122 return DSS_CLK_SRC_PLL2_1;
124 return DSS_CLK_SRC_FCK;
127 case DSS_MODEL_OMAP5:
129 case OMAP_DSS_CHANNEL_LCD:
130 return DSS_CLK_SRC_PLL1_1;
131 case OMAP_DSS_CHANNEL_LCD3:
132 return DSS_CLK_SRC_PLL2_1;
133 case OMAP_DSS_CHANNEL_LCD2:
135 return DSS_CLK_SRC_FCK;
139 return dpi_get_clk_src_dra7xx(channel);
142 return DSS_CLK_SRC_FCK;
146 struct dpi_clk_calc_ctx {
152 unsigned long pck_min, pck_max;
156 struct dss_pll_clock_info pll_cinfo;
158 struct dispc_clock_info dispc_cinfo;
161 static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
162 unsigned long pck, void *data)
164 struct dpi_clk_calc_ctx *ctx = data;
167 * Odd dividers give us uneven duty cycle, causing problem when level
168 * shifted. So skip all odd dividers when the pixel clock is on the
171 if (ctx->pck_min >= 100000000) {
172 if (lckd > 1 && lckd % 2 != 0)
175 if (pckd > 1 && pckd % 2 != 0)
179 ctx->dispc_cinfo.lck_div = lckd;
180 ctx->dispc_cinfo.pck_div = pckd;
181 ctx->dispc_cinfo.lck = lck;
182 ctx->dispc_cinfo.pck = pck;
188 static bool dpi_calc_hsdiv_cb(int m_dispc, unsigned long dispc,
191 struct dpi_clk_calc_ctx *ctx = data;
193 ctx->pll_cinfo.mX[ctx->clkout_idx] = m_dispc;
194 ctx->pll_cinfo.clkout[ctx->clkout_idx] = dispc;
196 return dispc_div_calc(dispc, ctx->pck_min, ctx->pck_max,
197 dpi_calc_dispc_cb, ctx);
201 static bool dpi_calc_pll_cb(int n, int m, unsigned long fint,
202 unsigned long clkdco,
205 struct dpi_clk_calc_ctx *ctx = data;
207 ctx->pll_cinfo.n = n;
208 ctx->pll_cinfo.m = m;
209 ctx->pll_cinfo.fint = fint;
210 ctx->pll_cinfo.clkdco = clkdco;
212 return dss_pll_hsdiv_calc_a(ctx->pll, clkdco,
213 ctx->pck_min, dss_get_max_fck_rate(),
214 dpi_calc_hsdiv_cb, ctx);
217 static bool dpi_calc_dss_cb(unsigned long fck, void *data)
219 struct dpi_clk_calc_ctx *ctx = data;
223 return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
224 dpi_calc_dispc_cb, ctx);
227 static bool dpi_pll_clk_calc(struct dpi_data *dpi, unsigned long pck,
228 struct dpi_clk_calc_ctx *ctx)
232 memset(ctx, 0, sizeof(*ctx));
234 ctx->clkout_idx = dss_pll_get_clkout_idx_for_src(dpi->clk_src);
236 clkin = clk_get_rate(dpi->pll->clkin);
238 if (dpi->pll->hw->type == DSS_PLL_TYPE_A) {
239 unsigned long pll_min, pll_max;
241 ctx->pck_min = pck - 1000;
242 ctx->pck_max = pck + 1000;
247 return dss_pll_calc_a(ctx->pll, clkin,
249 dpi_calc_pll_cb, ctx);
250 } else { /* DSS_PLL_TYPE_B */
251 dss_pll_calc_b(dpi->pll, clkin, pck, &ctx->pll_cinfo);
253 ctx->dispc_cinfo.lck_div = 1;
254 ctx->dispc_cinfo.pck_div = 1;
255 ctx->dispc_cinfo.lck = ctx->pll_cinfo.clkout[0];
256 ctx->dispc_cinfo.pck = ctx->dispc_cinfo.lck;
262 static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
267 * DSS fck gives us very few possibilities, so finding a good pixel
268 * clock may not be possible. We try multiple times to find the clock,
269 * each time widening the pixel clock range we look for, up to
273 for (i = 0; i < 25; ++i) {
276 memset(ctx, 0, sizeof(*ctx));
277 if (pck > 1000 * i * i * i)
278 ctx->pck_min = max(pck - 1000 * i * i * i, 0lu);
281 ctx->pck_max = pck + 1000 * i * i * i;
283 ok = dss_div_calc(pck, ctx->pck_min, dpi_calc_dss_cb, ctx);
293 static int dpi_set_pll_clk(struct dpi_data *dpi, enum omap_channel channel,
294 unsigned long pck_req, unsigned long *fck, int *lck_div,
297 struct dpi_clk_calc_ctx ctx;
301 ok = dpi_pll_clk_calc(dpi, pck_req, &ctx);
305 r = dss_pll_set_config(dpi->pll, &ctx.pll_cinfo);
309 dss_select_lcd_clk_source(channel, dpi->clk_src);
311 dpi->mgr_config.clock_info = ctx.dispc_cinfo;
313 *fck = ctx.pll_cinfo.clkout[ctx.clkout_idx];
314 *lck_div = ctx.dispc_cinfo.lck_div;
315 *pck_div = ctx.dispc_cinfo.pck_div;
320 static int dpi_set_dispc_clk(struct dpi_data *dpi, unsigned long pck_req,
321 unsigned long *fck, int *lck_div, int *pck_div)
323 struct dpi_clk_calc_ctx ctx;
327 ok = dpi_dss_clk_calc(pck_req, &ctx);
331 r = dss_set_fck_rate(ctx.fck);
335 dpi->mgr_config.clock_info = ctx.dispc_cinfo;
338 *lck_div = ctx.dispc_cinfo.lck_div;
339 *pck_div = ctx.dispc_cinfo.pck_div;
344 static int dpi_set_mode(struct dpi_data *dpi)
346 struct omap_dss_device *out = &dpi->output;
347 enum omap_channel channel = out->dispc_channel;
348 struct videomode *vm = &dpi->vm;
349 int lck_div = 0, pck_div = 0;
350 unsigned long fck = 0;
355 r = dpi_set_pll_clk(dpi, channel, vm->pixelclock, &fck,
358 r = dpi_set_dispc_clk(dpi, vm->pixelclock, &fck,
363 pck = fck / lck_div / pck_div;
365 if (pck != vm->pixelclock) {
366 DSSWARN("Could not find exact pixel clock. Requested %lu Hz, got %lu Hz\n",
367 vm->pixelclock, pck);
369 vm->pixelclock = pck;
372 dss_mgr_set_timings(channel, vm);
377 static void dpi_config_lcd_manager(struct dpi_data *dpi)
379 struct omap_dss_device *out = &dpi->output;
380 enum omap_channel channel = out->dispc_channel;
382 dpi->mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
384 dpi->mgr_config.stallmode = false;
385 dpi->mgr_config.fifohandcheck = false;
387 dpi->mgr_config.video_port_width = dpi->data_lines;
389 dpi->mgr_config.lcden_sig_polarity = 0;
391 dss_mgr_set_lcd_config(channel, &dpi->mgr_config);
394 static int dpi_display_enable(struct omap_dss_device *dssdev)
396 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
397 struct omap_dss_device *out = &dpi->output;
398 enum omap_channel channel = out->dispc_channel;
401 mutex_lock(&dpi->lock);
403 if (!out->dispc_channel_connected) {
404 DSSERR("failed to enable display: no output/manager\n");
409 if (dpi->vdds_dsi_reg) {
410 r = regulator_enable(dpi->vdds_dsi_reg);
415 r = dispc_runtime_get();
419 r = dss_dpi_select_source(out->port_num, channel);
424 r = dss_pll_enable(dpi->pll);
429 r = dpi_set_mode(dpi);
433 dpi_config_lcd_manager(dpi);
437 r = dss_mgr_enable(channel);
441 mutex_unlock(&dpi->lock);
448 dss_pll_disable(dpi->pll);
453 if (dpi->vdds_dsi_reg)
454 regulator_disable(dpi->vdds_dsi_reg);
457 mutex_unlock(&dpi->lock);
461 static void dpi_display_disable(struct omap_dss_device *dssdev)
463 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
464 enum omap_channel channel = dpi->output.dispc_channel;
466 mutex_lock(&dpi->lock);
468 dss_mgr_disable(channel);
471 dss_select_lcd_clk_source(channel, DSS_CLK_SRC_FCK);
472 dss_pll_disable(dpi->pll);
477 if (dpi->vdds_dsi_reg)
478 regulator_disable(dpi->vdds_dsi_reg);
480 mutex_unlock(&dpi->lock);
483 static void dpi_set_timings(struct omap_dss_device *dssdev,
484 struct videomode *vm)
486 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
488 DSSDBG("dpi_set_timings\n");
490 mutex_lock(&dpi->lock);
494 mutex_unlock(&dpi->lock);
497 static void dpi_get_timings(struct omap_dss_device *dssdev,
498 struct videomode *vm)
500 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
502 mutex_lock(&dpi->lock);
506 mutex_unlock(&dpi->lock);
509 static int dpi_check_timings(struct omap_dss_device *dssdev,
510 struct videomode *vm)
512 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
513 enum omap_channel channel = dpi->output.dispc_channel;
514 int lck_div, pck_div;
517 struct dpi_clk_calc_ctx ctx;
520 if (vm->hactive % 8 != 0)
523 if (!dispc_mgr_timings_ok(channel, vm))
526 if (vm->pixelclock == 0)
530 ok = dpi_pll_clk_calc(dpi, vm->pixelclock, &ctx);
534 fck = ctx.pll_cinfo.clkout[ctx.clkout_idx];
536 ok = dpi_dss_clk_calc(vm->pixelclock, &ctx);
543 lck_div = ctx.dispc_cinfo.lck_div;
544 pck_div = ctx.dispc_cinfo.pck_div;
546 pck = fck / lck_div / pck_div;
548 vm->pixelclock = pck;
553 static int dpi_verify_pll(struct dss_pll *pll)
557 /* do initial setup with the PLL to see if it is operational */
559 r = dss_pll_enable(pll);
563 dss_pll_disable(pll);
568 static const struct soc_device_attribute dpi_soc_devices[] = {
569 { .family = "OMAP3[456]*" },
570 { .family = "[AD]M37*" },
574 static int dpi_init_regulator(struct dpi_data *dpi)
576 struct regulator *vdds_dsi;
579 * The DPI uses the DSI VDDS on OMAP34xx, OMAP35xx, OMAP36xx, AM37xx and
582 if (!soc_device_match(dpi_soc_devices))
585 if (dpi->vdds_dsi_reg)
588 vdds_dsi = devm_regulator_get(&dpi->pdev->dev, "vdds_dsi");
589 if (IS_ERR(vdds_dsi)) {
590 if (PTR_ERR(vdds_dsi) != -EPROBE_DEFER)
591 DSSERR("can't get VDDS_DSI regulator\n");
592 return PTR_ERR(vdds_dsi);
595 dpi->vdds_dsi_reg = vdds_dsi;
600 static void dpi_init_pll(struct dpi_data *dpi)
607 dpi->clk_src = dpi_get_clk_src(dpi);
609 pll = dss_pll_find_by_src(dpi->clk_src);
613 if (dpi_verify_pll(pll)) {
614 DSSWARN("PLL not operational\n");
622 * Return a hardcoded channel for the DPI output. This should work for
623 * current use cases, but this can be later expanded to either resolve
624 * the channel in some more dynamic manner, or get the channel as a user
627 static enum omap_channel dpi_get_channel(struct dpi_data *dpi, int port_num)
629 switch (dpi->dss_model) {
630 case DSS_MODEL_OMAP2:
631 case DSS_MODEL_OMAP3:
632 return OMAP_DSS_CHANNEL_LCD;
637 return OMAP_DSS_CHANNEL_LCD3;
639 return OMAP_DSS_CHANNEL_LCD2;
642 return OMAP_DSS_CHANNEL_LCD;
645 case DSS_MODEL_OMAP4:
646 return OMAP_DSS_CHANNEL_LCD2;
648 case DSS_MODEL_OMAP5:
649 return OMAP_DSS_CHANNEL_LCD3;
652 DSSWARN("unsupported DSS version\n");
653 return OMAP_DSS_CHANNEL_LCD;
657 static int dpi_connect(struct omap_dss_device *dssdev,
658 struct omap_dss_device *dst)
660 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
661 enum omap_channel channel = dpi->output.dispc_channel;
664 r = dpi_init_regulator(dpi);
670 r = dss_mgr_connect(channel, dssdev);
674 r = omapdss_output_set_device(dssdev, dst);
676 DSSERR("failed to connect output to new device: %s\n",
678 dss_mgr_disconnect(channel, dssdev);
685 static void dpi_disconnect(struct omap_dss_device *dssdev,
686 struct omap_dss_device *dst)
688 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
689 enum omap_channel channel = dpi->output.dispc_channel;
691 WARN_ON(dst != dssdev->dst);
693 if (dst != dssdev->dst)
696 omapdss_output_unset_device(dssdev);
698 dss_mgr_disconnect(channel, dssdev);
701 static const struct omapdss_dpi_ops dpi_ops = {
702 .connect = dpi_connect,
703 .disconnect = dpi_disconnect,
705 .enable = dpi_display_enable,
706 .disable = dpi_display_disable,
708 .check_timings = dpi_check_timings,
709 .set_timings = dpi_set_timings,
710 .get_timings = dpi_get_timings,
713 static void dpi_init_output_port(struct dpi_data *dpi, struct device_node *port)
715 struct omap_dss_device *out = &dpi->output;
719 r = of_property_read_u32(port, "reg", &port_num);
736 out->dev = &dpi->pdev->dev;
737 out->id = OMAP_DSS_OUTPUT_DPI;
738 out->output_type = OMAP_DISPLAY_TYPE_DPI;
739 out->dispc_channel = dpi_get_channel(dpi, port_num);
740 out->port_num = port_num;
741 out->ops.dpi = &dpi_ops;
742 out->owner = THIS_MODULE;
744 omapdss_register_output(out);
747 static void dpi_uninit_output_port(struct device_node *port)
749 struct dpi_data *dpi = port->data;
750 struct omap_dss_device *out = &dpi->output;
752 omapdss_unregister_output(out);
755 int dpi_init_port(struct platform_device *pdev, struct device_node *port,
756 enum dss_model dss_model)
758 struct dpi_data *dpi;
759 struct device_node *ep;
763 dpi = devm_kzalloc(&pdev->dev, sizeof(*dpi), GFP_KERNEL);
767 ep = of_get_next_child(port, NULL);
771 r = of_property_read_u32(ep, "data-lines", &datalines);
773 DSSERR("failed to parse datalines\n");
777 dpi->data_lines = datalines;
782 dpi->dss_model = dss_model;
785 mutex_init(&dpi->lock);
787 dpi_init_output_port(dpi, port);
789 dpi->port_initialized = true;
799 void dpi_uninit_port(struct device_node *port)
801 struct dpi_data *dpi = port->data;
803 if (!dpi->port_initialized)
806 dpi_uninit_output_port(port);