2 * Copyright (C) 2015 Free Electrons
3 * Copyright (C) 2015 NextThing Co
5 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
14 #include <drm/drm_atomic_helper.h>
15 #include <drm/drm_crtc.h>
16 #include <drm/drm_crtc_helper.h>
17 #include <drm/drm_encoder.h>
18 #include <drm/drm_modes.h>
19 #include <drm/drm_of.h>
21 #include <uapi/drm/drm_mode.h>
23 #include <linux/component.h>
24 #include <linux/ioport.h>
25 #include <linux/of_address.h>
26 #include <linux/of_device.h>
27 #include <linux/of_irq.h>
28 #include <linux/regmap.h>
29 #include <linux/reset.h>
31 #include "sun4i_crtc.h"
32 #include "sun4i_dotclock.h"
33 #include "sun4i_drv.h"
34 #include "sun4i_rgb.h"
35 #include "sun4i_tcon.h"
36 #include "sunxi_engine.h"
38 static void sun4i_tcon_channel_set_status(struct sun4i_tcon
*tcon
, int channel
,
45 regmap_update_bits(tcon
->regs
, SUN4I_TCON0_CTL_REG
,
46 SUN4I_TCON0_CTL_TCON_ENABLE
,
47 enabled
? SUN4I_TCON0_CTL_TCON_ENABLE
: 0);
51 WARN_ON(!tcon
->quirks
->has_channel_1
);
52 regmap_update_bits(tcon
->regs
, SUN4I_TCON1_CTL_REG
,
53 SUN4I_TCON1_CTL_TCON_ENABLE
,
54 enabled
? SUN4I_TCON1_CTL_TCON_ENABLE
: 0);
58 DRM_WARN("Unknown channel... doing nothing\n");
63 clk_prepare_enable(clk
);
65 clk_disable_unprepare(clk
);
68 void sun4i_tcon_set_status(struct sun4i_tcon
*tcon
,
69 const struct drm_encoder
*encoder
,
74 switch (encoder
->encoder_type
) {
75 case DRM_MODE_ENCODER_NONE
:
78 case DRM_MODE_ENCODER_TMDS
:
79 case DRM_MODE_ENCODER_TVDAC
:
83 DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n");
87 regmap_update_bits(tcon
->regs
, SUN4I_TCON_GCTL_REG
,
88 SUN4I_TCON_GCTL_TCON_ENABLE
,
89 enabled
? SUN4I_TCON_GCTL_TCON_ENABLE
: 0);
91 sun4i_tcon_channel_set_status(tcon
, channel
, enabled
);
94 void sun4i_tcon_enable_vblank(struct sun4i_tcon
*tcon
, bool enable
)
98 DRM_DEBUG_DRIVER("%sabling VBLANK interrupt\n", enable
? "En" : "Dis");
100 mask
= SUN4I_TCON_GINT0_VBLANK_ENABLE(0) |
101 SUN4I_TCON_GINT0_VBLANK_ENABLE(1);
106 regmap_update_bits(tcon
->regs
, SUN4I_TCON_GINT0_REG
, mask
, val
);
108 EXPORT_SYMBOL(sun4i_tcon_enable_vblank
);
111 * This function is a helper for TCON output muxing. The TCON output
112 * muxing control register in earlier SoCs (without the TCON TOP block)
113 * are located in TCON0. This helper returns a pointer to TCON0's
114 * sun4i_tcon structure, or NULL if not found.
116 static struct sun4i_tcon
*sun4i_get_tcon0(struct drm_device
*drm
)
118 struct sun4i_drv
*drv
= drm
->dev_private
;
119 struct sun4i_tcon
*tcon
;
121 list_for_each_entry(tcon
, &drv
->tcon_list
, list
)
126 "TCON0 not found, display output muxing may not work\n");
131 void sun4i_tcon_set_mux(struct sun4i_tcon
*tcon
, int channel
,
132 const struct drm_encoder
*encoder
)
136 if (tcon
->quirks
->set_mux
)
137 ret
= tcon
->quirks
->set_mux(tcon
, encoder
);
139 DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s: %d\n",
140 encoder
->name
, encoder
->crtc
->name
, ret
);
143 static int sun4i_tcon_get_clk_delay(const struct drm_display_mode
*mode
,
146 int delay
= mode
->vtotal
- mode
->vdisplay
;
148 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
154 delay
= min(delay
, 30);
156 DRM_DEBUG_DRIVER("TCON %d clock delay %u\n", channel
, delay
);
161 static void sun4i_tcon0_mode_set_common(struct sun4i_tcon
*tcon
,
162 const struct drm_display_mode
*mode
)
164 /* Configure the dot clock */
165 clk_set_rate(tcon
->dclk
, mode
->crtc_clock
* 1000);
167 /* Set the resolution */
168 regmap_write(tcon
->regs
, SUN4I_TCON0_BASIC0_REG
,
169 SUN4I_TCON0_BASIC0_X(mode
->crtc_hdisplay
) |
170 SUN4I_TCON0_BASIC0_Y(mode
->crtc_vdisplay
));
173 static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon
*tcon
,
174 const struct drm_display_mode
*mode
)
176 unsigned int bp
, hsync
, vsync
;
180 sun4i_tcon0_mode_set_common(tcon
, mode
);
182 /* Adjust clock delay */
183 clk_delay
= sun4i_tcon_get_clk_delay(mode
, 0);
184 regmap_update_bits(tcon
->regs
, SUN4I_TCON0_CTL_REG
,
185 SUN4I_TCON0_CTL_CLK_DELAY_MASK
,
186 SUN4I_TCON0_CTL_CLK_DELAY(clk_delay
));
189 * This is called a backporch in the register documentation,
190 * but it really is the back porch + hsync
192 bp
= mode
->crtc_htotal
- mode
->crtc_hsync_start
;
193 DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
194 mode
->crtc_htotal
, bp
);
196 /* Set horizontal display timings */
197 regmap_write(tcon
->regs
, SUN4I_TCON0_BASIC1_REG
,
198 SUN4I_TCON0_BASIC1_H_TOTAL(mode
->crtc_htotal
) |
199 SUN4I_TCON0_BASIC1_H_BACKPORCH(bp
));
202 * This is called a backporch in the register documentation,
203 * but it really is the back porch + hsync
205 bp
= mode
->crtc_vtotal
- mode
->crtc_vsync_start
;
206 DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
207 mode
->crtc_vtotal
, bp
);
209 /* Set vertical display timings */
210 regmap_write(tcon
->regs
, SUN4I_TCON0_BASIC2_REG
,
211 SUN4I_TCON0_BASIC2_V_TOTAL(mode
->crtc_vtotal
* 2) |
212 SUN4I_TCON0_BASIC2_V_BACKPORCH(bp
));
214 /* Set Hsync and Vsync length */
215 hsync
= mode
->crtc_hsync_end
- mode
->crtc_hsync_start
;
216 vsync
= mode
->crtc_vsync_end
- mode
->crtc_vsync_start
;
217 DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync
, vsync
);
218 regmap_write(tcon
->regs
, SUN4I_TCON0_BASIC3_REG
,
219 SUN4I_TCON0_BASIC3_V_SYNC(vsync
) |
220 SUN4I_TCON0_BASIC3_H_SYNC(hsync
));
222 /* Setup the polarity of the various signals */
223 if (!(mode
->flags
& DRM_MODE_FLAG_PHSYNC
))
224 val
|= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE
;
226 if (!(mode
->flags
& DRM_MODE_FLAG_PVSYNC
))
227 val
|= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE
;
229 regmap_update_bits(tcon
->regs
, SUN4I_TCON0_IO_POL_REG
,
230 SUN4I_TCON0_IO_POL_HSYNC_POSITIVE
| SUN4I_TCON0_IO_POL_VSYNC_POSITIVE
,
233 /* Map output pins to channel 0 */
234 regmap_update_bits(tcon
->regs
, SUN4I_TCON_GCTL_REG
,
235 SUN4I_TCON_GCTL_IOMAP_MASK
,
236 SUN4I_TCON_GCTL_IOMAP_TCON0
);
238 /* Enable the output on the pins */
239 regmap_write(tcon
->regs
, SUN4I_TCON0_IO_TRI_REG
, 0);
242 static void sun4i_tcon1_mode_set(struct sun4i_tcon
*tcon
,
243 const struct drm_display_mode
*mode
)
245 unsigned int bp
, hsync
, vsync
, vtotal
;
249 WARN_ON(!tcon
->quirks
->has_channel_1
);
251 /* Configure the dot clock */
252 clk_set_rate(tcon
->sclk1
, mode
->crtc_clock
* 1000);
254 /* Adjust clock delay */
255 clk_delay
= sun4i_tcon_get_clk_delay(mode
, 1);
256 regmap_update_bits(tcon
->regs
, SUN4I_TCON1_CTL_REG
,
257 SUN4I_TCON1_CTL_CLK_DELAY_MASK
,
258 SUN4I_TCON1_CTL_CLK_DELAY(clk_delay
));
260 /* Set interlaced mode */
261 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
262 val
= SUN4I_TCON1_CTL_INTERLACE_ENABLE
;
265 regmap_update_bits(tcon
->regs
, SUN4I_TCON1_CTL_REG
,
266 SUN4I_TCON1_CTL_INTERLACE_ENABLE
,
269 /* Set the input resolution */
270 regmap_write(tcon
->regs
, SUN4I_TCON1_BASIC0_REG
,
271 SUN4I_TCON1_BASIC0_X(mode
->crtc_hdisplay
) |
272 SUN4I_TCON1_BASIC0_Y(mode
->crtc_vdisplay
));
274 /* Set the upscaling resolution */
275 regmap_write(tcon
->regs
, SUN4I_TCON1_BASIC1_REG
,
276 SUN4I_TCON1_BASIC1_X(mode
->crtc_hdisplay
) |
277 SUN4I_TCON1_BASIC1_Y(mode
->crtc_vdisplay
));
279 /* Set the output resolution */
280 regmap_write(tcon
->regs
, SUN4I_TCON1_BASIC2_REG
,
281 SUN4I_TCON1_BASIC2_X(mode
->crtc_hdisplay
) |
282 SUN4I_TCON1_BASIC2_Y(mode
->crtc_vdisplay
));
284 /* Set horizontal display timings */
285 bp
= mode
->crtc_htotal
- mode
->crtc_hsync_start
;
286 DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
288 regmap_write(tcon
->regs
, SUN4I_TCON1_BASIC3_REG
,
289 SUN4I_TCON1_BASIC3_H_TOTAL(mode
->crtc_htotal
) |
290 SUN4I_TCON1_BASIC3_H_BACKPORCH(bp
));
292 bp
= mode
->crtc_vtotal
- mode
->crtc_vsync_start
;
293 DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
294 mode
->crtc_vtotal
, bp
);
297 * The vertical resolution needs to be doubled in all
298 * cases. We could use crtc_vtotal and always multiply by two,
299 * but that leads to a rounding error in interlace when vtotal
302 * This happens with TV's PAL for example, where vtotal will
303 * be 625, crtc_vtotal 312, and thus crtc_vtotal * 2 will be
304 * 624, which apparently confuses the hardware.
306 * To work around this, we will always use vtotal, and
307 * multiply by two only if we're not in interlace.
309 vtotal
= mode
->vtotal
;
310 if (!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
))
313 /* Set vertical display timings */
314 regmap_write(tcon
->regs
, SUN4I_TCON1_BASIC4_REG
,
315 SUN4I_TCON1_BASIC4_V_TOTAL(vtotal
) |
316 SUN4I_TCON1_BASIC4_V_BACKPORCH(bp
));
318 /* Set Hsync and Vsync length */
319 hsync
= mode
->crtc_hsync_end
- mode
->crtc_hsync_start
;
320 vsync
= mode
->crtc_vsync_end
- mode
->crtc_vsync_start
;
321 DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync
, vsync
);
322 regmap_write(tcon
->regs
, SUN4I_TCON1_BASIC5_REG
,
323 SUN4I_TCON1_BASIC5_V_SYNC(vsync
) |
324 SUN4I_TCON1_BASIC5_H_SYNC(hsync
));
326 /* Map output pins to channel 1 */
327 regmap_update_bits(tcon
->regs
, SUN4I_TCON_GCTL_REG
,
328 SUN4I_TCON_GCTL_IOMAP_MASK
,
329 SUN4I_TCON_GCTL_IOMAP_TCON1
);
332 void sun4i_tcon_mode_set(struct sun4i_tcon
*tcon
,
333 const struct drm_encoder
*encoder
,
334 const struct drm_display_mode
*mode
)
336 switch (encoder
->encoder_type
) {
337 case DRM_MODE_ENCODER_NONE
:
338 sun4i_tcon0_mode_set_rgb(tcon
, mode
);
339 sun4i_tcon_set_mux(tcon
, 0, encoder
);
341 case DRM_MODE_ENCODER_TVDAC
:
342 case DRM_MODE_ENCODER_TMDS
:
343 sun4i_tcon1_mode_set(tcon
, mode
);
344 sun4i_tcon_set_mux(tcon
, 1, encoder
);
347 DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n");
350 EXPORT_SYMBOL(sun4i_tcon_mode_set
);
352 static void sun4i_tcon_finish_page_flip(struct drm_device
*dev
,
353 struct sun4i_crtc
*scrtc
)
357 spin_lock_irqsave(&dev
->event_lock
, flags
);
359 drm_crtc_send_vblank_event(&scrtc
->crtc
, scrtc
->event
);
360 drm_crtc_vblank_put(&scrtc
->crtc
);
363 spin_unlock_irqrestore(&dev
->event_lock
, flags
);
366 static irqreturn_t
sun4i_tcon_handler(int irq
, void *private)
368 struct sun4i_tcon
*tcon
= private;
369 struct drm_device
*drm
= tcon
->drm
;
370 struct sun4i_crtc
*scrtc
= tcon
->crtc
;
373 regmap_read(tcon
->regs
, SUN4I_TCON_GINT0_REG
, &status
);
375 if (!(status
& (SUN4I_TCON_GINT0_VBLANK_INT(0) |
376 SUN4I_TCON_GINT0_VBLANK_INT(1))))
379 drm_crtc_handle_vblank(&scrtc
->crtc
);
380 sun4i_tcon_finish_page_flip(drm
, scrtc
);
382 /* Acknowledge the interrupt */
383 regmap_update_bits(tcon
->regs
, SUN4I_TCON_GINT0_REG
,
384 SUN4I_TCON_GINT0_VBLANK_INT(0) |
385 SUN4I_TCON_GINT0_VBLANK_INT(1),
391 static int sun4i_tcon_init_clocks(struct device
*dev
,
392 struct sun4i_tcon
*tcon
)
394 tcon
->clk
= devm_clk_get(dev
, "ahb");
395 if (IS_ERR(tcon
->clk
)) {
396 dev_err(dev
, "Couldn't get the TCON bus clock\n");
397 return PTR_ERR(tcon
->clk
);
399 clk_prepare_enable(tcon
->clk
);
401 tcon
->sclk0
= devm_clk_get(dev
, "tcon-ch0");
402 if (IS_ERR(tcon
->sclk0
)) {
403 dev_err(dev
, "Couldn't get the TCON channel 0 clock\n");
404 return PTR_ERR(tcon
->sclk0
);
407 if (tcon
->quirks
->has_channel_1
) {
408 tcon
->sclk1
= devm_clk_get(dev
, "tcon-ch1");
409 if (IS_ERR(tcon
->sclk1
)) {
410 dev_err(dev
, "Couldn't get the TCON channel 1 clock\n");
411 return PTR_ERR(tcon
->sclk1
);
418 static void sun4i_tcon_free_clocks(struct sun4i_tcon
*tcon
)
420 clk_disable_unprepare(tcon
->clk
);
423 static int sun4i_tcon_init_irq(struct device
*dev
,
424 struct sun4i_tcon
*tcon
)
426 struct platform_device
*pdev
= to_platform_device(dev
);
429 irq
= platform_get_irq(pdev
, 0);
431 dev_err(dev
, "Couldn't retrieve the TCON interrupt\n");
435 ret
= devm_request_irq(dev
, irq
, sun4i_tcon_handler
, 0,
436 dev_name(dev
), tcon
);
438 dev_err(dev
, "Couldn't request the IRQ\n");
445 static struct regmap_config sun4i_tcon_regmap_config
= {
449 .max_register
= 0x800,
452 static int sun4i_tcon_init_regmap(struct device
*dev
,
453 struct sun4i_tcon
*tcon
)
455 struct platform_device
*pdev
= to_platform_device(dev
);
456 struct resource
*res
;
459 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
460 regs
= devm_ioremap_resource(dev
, res
);
462 return PTR_ERR(regs
);
464 tcon
->regs
= devm_regmap_init_mmio(dev
, regs
,
465 &sun4i_tcon_regmap_config
);
466 if (IS_ERR(tcon
->regs
)) {
467 dev_err(dev
, "Couldn't create the TCON regmap\n");
468 return PTR_ERR(tcon
->regs
);
471 /* Make sure the TCON is disabled and all IRQs are off */
472 regmap_write(tcon
->regs
, SUN4I_TCON_GCTL_REG
, 0);
473 regmap_write(tcon
->regs
, SUN4I_TCON_GINT0_REG
, 0);
474 regmap_write(tcon
->regs
, SUN4I_TCON_GINT1_REG
, 0);
476 /* Disable IO lines and set them to tristate */
477 regmap_write(tcon
->regs
, SUN4I_TCON0_IO_TRI_REG
, ~0);
478 regmap_write(tcon
->regs
, SUN4I_TCON1_IO_TRI_REG
, ~0);
484 * On SoCs with the old display pipeline design (Display Engine 1.0),
485 * the TCON is always tied to just one backend. Hence we can traverse
486 * the of_graph upwards to find the backend our tcon is connected to,
487 * and take its ID as our own.
489 * We can either identify backends from their compatible strings, which
490 * means maintaining a large list of them. Or, since the backend is
491 * registered and binded before the TCON, we can just go through the
492 * list of registered backends and compare the device node.
494 * As the structures now store engines instead of backends, here this
495 * function in fact searches the corresponding engine, and the ID is
496 * requested via the get_id function of the engine.
498 static struct sunxi_engine
*
499 sun4i_tcon_find_engine_traverse(struct sun4i_drv
*drv
,
500 struct device_node
*node
)
502 struct device_node
*port
, *ep
, *remote
;
503 struct sunxi_engine
*engine
= ERR_PTR(-EINVAL
);
505 port
= of_graph_get_port_by_id(node
, 0);
507 return ERR_PTR(-EINVAL
);
510 * This only works if there is only one path from the TCON
511 * to any display engine. Otherwise the probe order of the
512 * TCONs and display engines is not guaranteed. They may
513 * either bind to the wrong one, or worse, bind to the same
514 * one if additional checks are not done.
516 * Bail out if there are multiple input connections.
518 if (of_get_available_child_count(port
) != 1)
521 /* Get the first connection without specifying an ID */
522 ep
= of_get_next_available_child(port
, NULL
);
526 remote
= of_graph_get_remote_port_parent(ep
);
530 /* does this node match any registered engines? */
531 list_for_each_entry(engine
, &drv
->engine_list
, list
)
532 if (remote
== engine
->node
)
535 /* keep looking through upstream ports */
536 engine
= sun4i_tcon_find_engine_traverse(drv
, remote
);
549 * The device tree binding says that the remote endpoint ID of any
550 * connection between components, up to and including the TCON, of
551 * the display pipeline should be equal to the actual ID of the local
552 * component. Thus we can look at any one of the input connections of
553 * the TCONs, and use that connection's remote endpoint ID as our own.
555 * Since the user of this function already finds the input port,
556 * the port is passed in directly without further checks.
558 static int sun4i_tcon_of_get_id_from_port(struct device_node
*port
)
560 struct device_node
*ep
;
563 /* try finding an upstream endpoint */
564 for_each_available_child_of_node(port
, ep
) {
565 struct device_node
*remote
;
568 remote
= of_graph_get_remote_endpoint(ep
);
572 ret
= of_property_read_u32(remote
, "reg", ®
);
583 * Once we know the TCON's id, we can look through the list of
584 * engines to find a matching one. We assume all engines have
585 * been probed and added to the list.
587 static struct sunxi_engine
*sun4i_tcon_get_engine_by_id(struct sun4i_drv
*drv
,
590 struct sunxi_engine
*engine
;
592 list_for_each_entry(engine
, &drv
->engine_list
, list
)
593 if (engine
->id
== id
)
596 return ERR_PTR(-EINVAL
);
600 * On SoCs with the old display pipeline design (Display Engine 1.0),
601 * we assumed the TCON was always tied to just one backend. However
602 * this proved not to be the case. On the A31, the TCON can select
603 * either backend as its source. On the A20 (and likely on the A10),
604 * the backend can choose which TCON to output to.
606 * The device tree binding says that the remote endpoint ID of any
607 * connection between components, up to and including the TCON, of
608 * the display pipeline should be equal to the actual ID of the local
609 * component. Thus we should be able to look at any one of the input
610 * connections of the TCONs, and use that connection's remote endpoint
613 * However the connections between the backend and TCON were assumed
614 * to be always singular, and their endpoit IDs were all incorrectly
615 * set to 0. This means for these old device trees, we cannot just look
616 * up the remote endpoint ID of a TCON input endpoint. TCON1 would be
617 * incorrectly identified as TCON0.
619 * This function first checks if the TCON node has 2 input endpoints.
620 * If so, then the device tree is a corrected version, and it will use
621 * sun4i_tcon_of_get_id() and sun4i_tcon_get_engine_by_id() from above
622 * to fetch the ID and engine directly. If not, then it is likely an
623 * old device trees, where the endpoint IDs were incorrect, but did not
624 * have endpoint connections between the backend and TCON across
625 * different display pipelines. It will fall back to the old method of
626 * traversing the of_graph to try and find a matching engine by device
629 * In the case of single display pipeline device trees, either method
632 static struct sunxi_engine
*sun4i_tcon_find_engine(struct sun4i_drv
*drv
,
633 struct device_node
*node
)
635 struct device_node
*port
;
636 struct sunxi_engine
*engine
;
638 port
= of_graph_get_port_by_id(node
, 0);
640 return ERR_PTR(-EINVAL
);
643 * Is this a corrected device tree with cross pipeline
644 * connections between the backend and TCON?
646 if (of_get_child_count(port
) > 1) {
647 /* Get our ID directly from an upstream endpoint */
648 int id
= sun4i_tcon_of_get_id_from_port(port
);
650 /* Get our engine by matching our ID */
651 engine
= sun4i_tcon_get_engine_by_id(drv
, id
);
657 /* Fallback to old method by traversing input endpoints */
659 return sun4i_tcon_find_engine_traverse(drv
, node
);
662 static int sun4i_tcon_bind(struct device
*dev
, struct device
*master
,
665 struct drm_device
*drm
= data
;
666 struct sun4i_drv
*drv
= drm
->dev_private
;
667 struct sunxi_engine
*engine
;
668 struct sun4i_tcon
*tcon
;
671 engine
= sun4i_tcon_find_engine(drv
, dev
->of_node
);
672 if (IS_ERR(engine
)) {
673 dev_err(dev
, "Couldn't find matching engine\n");
674 return -EPROBE_DEFER
;
677 tcon
= devm_kzalloc(dev
, sizeof(*tcon
), GFP_KERNEL
);
680 dev_set_drvdata(dev
, tcon
);
683 tcon
->id
= engine
->id
;
684 tcon
->quirks
= of_device_get_match_data(dev
);
686 tcon
->lcd_rst
= devm_reset_control_get(dev
, "lcd");
687 if (IS_ERR(tcon
->lcd_rst
)) {
688 dev_err(dev
, "Couldn't get our reset line\n");
689 return PTR_ERR(tcon
->lcd_rst
);
692 /* Make sure our TCON is reset */
693 ret
= reset_control_reset(tcon
->lcd_rst
);
695 dev_err(dev
, "Couldn't deassert our reset line\n");
699 ret
= sun4i_tcon_init_clocks(dev
, tcon
);
701 dev_err(dev
, "Couldn't init our TCON clocks\n");
702 goto err_assert_reset
;
705 ret
= sun4i_tcon_init_regmap(dev
, tcon
);
707 dev_err(dev
, "Couldn't init our TCON regmap\n");
708 goto err_free_clocks
;
711 ret
= sun4i_dclk_create(dev
, tcon
);
713 dev_err(dev
, "Couldn't create our TCON dot clock\n");
714 goto err_free_clocks
;
717 ret
= sun4i_tcon_init_irq(dev
, tcon
);
719 dev_err(dev
, "Couldn't init our TCON interrupts\n");
720 goto err_free_dotclock
;
723 tcon
->crtc
= sun4i_crtc_init(drm
, engine
, tcon
);
724 if (IS_ERR(tcon
->crtc
)) {
725 dev_err(dev
, "Couldn't create our CRTC\n");
726 ret
= PTR_ERR(tcon
->crtc
);
727 goto err_free_clocks
;
730 ret
= sun4i_rgb_init(drm
, tcon
);
732 goto err_free_clocks
;
734 if (tcon
->quirks
->needs_de_be_mux
) {
736 * We assume there is no dynamic muxing of backends
737 * and TCONs, so we select the backend with same ID.
739 * While dynamic selection might be interesting, since
740 * the CRTC is tied to the TCON, while the layers are
741 * tied to the backends, this means, we will need to
742 * switch between groups of layers. There might not be
743 * a way to represent this constraint in DRM.
745 regmap_update_bits(tcon
->regs
, SUN4I_TCON0_CTL_REG
,
746 SUN4I_TCON0_CTL_SRC_SEL_MASK
,
748 regmap_update_bits(tcon
->regs
, SUN4I_TCON1_CTL_REG
,
749 SUN4I_TCON1_CTL_SRC_SEL_MASK
,
753 list_add_tail(&tcon
->list
, &drv
->tcon_list
);
758 sun4i_dclk_free(tcon
);
760 sun4i_tcon_free_clocks(tcon
);
762 reset_control_assert(tcon
->lcd_rst
);
766 static void sun4i_tcon_unbind(struct device
*dev
, struct device
*master
,
769 struct sun4i_tcon
*tcon
= dev_get_drvdata(dev
);
771 list_del(&tcon
->list
);
772 sun4i_dclk_free(tcon
);
773 sun4i_tcon_free_clocks(tcon
);
776 static const struct component_ops sun4i_tcon_ops
= {
777 .bind
= sun4i_tcon_bind
,
778 .unbind
= sun4i_tcon_unbind
,
781 static int sun4i_tcon_probe(struct platform_device
*pdev
)
783 struct device_node
*node
= pdev
->dev
.of_node
;
784 struct drm_bridge
*bridge
;
785 struct drm_panel
*panel
;
788 ret
= drm_of_find_panel_or_bridge(node
, 1, 0, &panel
, &bridge
);
789 if (ret
== -EPROBE_DEFER
)
792 return component_add(&pdev
->dev
, &sun4i_tcon_ops
);
795 static int sun4i_tcon_remove(struct platform_device
*pdev
)
797 component_del(&pdev
->dev
, &sun4i_tcon_ops
);
802 /* platform specific TCON muxing callbacks */
803 static int sun4i_a10_tcon_set_mux(struct sun4i_tcon
*tcon
,
804 const struct drm_encoder
*encoder
)
806 struct sun4i_tcon
*tcon0
= sun4i_get_tcon0(encoder
->dev
);
812 switch (encoder
->encoder_type
) {
813 case DRM_MODE_ENCODER_TMDS
:
821 regmap_update_bits(tcon0
->regs
, SUN4I_TCON_MUX_CTRL_REG
,
822 0x3 << shift
, tcon
->id
<< shift
);
827 static int sun5i_a13_tcon_set_mux(struct sun4i_tcon
*tcon
,
828 const struct drm_encoder
*encoder
)
832 if (encoder
->encoder_type
== DRM_MODE_ENCODER_TVDAC
)
838 * FIXME: Undocumented bits
840 return regmap_write(tcon
->regs
, SUN4I_TCON_MUX_CTRL_REG
, val
);
843 static int sun6i_tcon_set_mux(struct sun4i_tcon
*tcon
,
844 const struct drm_encoder
*encoder
)
846 struct sun4i_tcon
*tcon0
= sun4i_get_tcon0(encoder
->dev
);
852 switch (encoder
->encoder_type
) {
853 case DRM_MODE_ENCODER_TMDS
:
858 /* TODO A31 has MIPI DSI but A31s does not */
862 regmap_update_bits(tcon0
->regs
, SUN4I_TCON_MUX_CTRL_REG
,
863 0x3 << shift
, tcon
->id
<< shift
);
868 static const struct sun4i_tcon_quirks sun4i_a10_quirks
= {
869 .has_channel_1
= true,
870 .set_mux
= sun4i_a10_tcon_set_mux
,
873 static const struct sun4i_tcon_quirks sun5i_a13_quirks
= {
874 .has_channel_1
= true,
875 .set_mux
= sun5i_a13_tcon_set_mux
,
878 static const struct sun4i_tcon_quirks sun6i_a31_quirks
= {
879 .has_channel_1
= true,
880 .needs_de_be_mux
= true,
881 .set_mux
= sun6i_tcon_set_mux
,
884 static const struct sun4i_tcon_quirks sun6i_a31s_quirks
= {
885 .has_channel_1
= true,
886 .needs_de_be_mux
= true,
889 static const struct sun4i_tcon_quirks sun7i_a20_quirks
= {
890 .has_channel_1
= true,
891 /* Same display pipeline structure as A10 */
892 .set_mux
= sun4i_a10_tcon_set_mux
,
895 static const struct sun4i_tcon_quirks sun8i_a33_quirks
= {
896 /* nothing is supported */
899 static const struct sun4i_tcon_quirks sun8i_v3s_quirks
= {
900 /* nothing is supported */
903 static const struct of_device_id sun4i_tcon_of_table
[] = {
904 { .compatible
= "allwinner,sun4i-a10-tcon", .data
= &sun4i_a10_quirks
},
905 { .compatible
= "allwinner,sun5i-a13-tcon", .data
= &sun5i_a13_quirks
},
906 { .compatible
= "allwinner,sun6i-a31-tcon", .data
= &sun6i_a31_quirks
},
907 { .compatible
= "allwinner,sun6i-a31s-tcon", .data
= &sun6i_a31s_quirks
},
908 { .compatible
= "allwinner,sun7i-a20-tcon", .data
= &sun7i_a20_quirks
},
909 { .compatible
= "allwinner,sun8i-a33-tcon", .data
= &sun8i_a33_quirks
},
910 { .compatible
= "allwinner,sun8i-v3s-tcon", .data
= &sun8i_v3s_quirks
},
913 MODULE_DEVICE_TABLE(of
, sun4i_tcon_of_table
);
915 static struct platform_driver sun4i_tcon_platform_driver
= {
916 .probe
= sun4i_tcon_probe
,
917 .remove
= sun4i_tcon_remove
,
919 .name
= "sun4i-tcon",
920 .of_match_table
= sun4i_tcon_of_table
,
923 module_platform_driver(sun4i_tcon_platform_driver
);
925 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
926 MODULE_DESCRIPTION("Allwinner A10 Timing Controller Driver");
927 MODULE_LICENSE("GPL");