intel_dvo.c revision a6b17b4367ed5d9bac94bc87d1489de3847fce98 
1/*
2 * Copyright 2006 Dave Airlie <airlied@linux.ie>
3 * Copyright © 2006-2007 Intel Corporation
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 *	Eric Anholt <eric@anholt.net>
26 */
27#include <linux/i2c.h>
28#include <linux/slab.h>
29#include "drmP.h"
30#include "drm.h"
31#include "drm_crtc.h"
32#include "intel_drv.h"
33#include "i915_drm.h"
34#include "i915_drv.h"
35#include "dvo.h"
36
37#define SIL164_ADDR	0x38
38#define CH7xxx_ADDR	0x76
39#define TFP410_ADDR	0x38
40
41static const struct intel_dvo_device intel_dvo_devices[] = {
42	{
43		.type = INTEL_DVO_CHIP_TMDS,
44		.name = "sil164",
45		.dvo_reg = DVOC,
46		.slave_addr = SIL164_ADDR,
47		.dev_ops = &sil164_ops,
48	},
49	{
50		.type = INTEL_DVO_CHIP_TMDS,
51		.name = "ch7xxx",
52		.dvo_reg = DVOC,
53		.slave_addr = CH7xxx_ADDR,
54		.dev_ops = &ch7xxx_ops,
55	},
56	{
57		.type = INTEL_DVO_CHIP_LVDS,
58		.name = "ivch",
59		.dvo_reg = DVOA,
60		.slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
61		.dev_ops = &ivch_ops,
62	},
63	{
64		.type = INTEL_DVO_CHIP_TMDS,
65		.name = "tfp410",
66		.dvo_reg = DVOC,
67		.slave_addr = TFP410_ADDR,
68		.dev_ops = &tfp410_ops,
69	},
70	{
71		.type = INTEL_DVO_CHIP_LVDS,
72		.name = "ch7017",
73		.dvo_reg = DVOC,
74		.slave_addr = 0x75,
75		.gpio = GMBUS_PORT_DPB,
76		.dev_ops = &ch7017_ops,
77	}
78};
79
80struct intel_dvo {
81	struct intel_encoder base;
82
83	struct intel_dvo_device dev;
84	int ddc_bus;
85
86	struct drm_display_mode *panel_fixed_mode;
87	bool panel_wants_dither;
88};
89
90static struct intel_dvo *enc_to_intel_dvo(struct drm_encoder *encoder)
91{
92	return container_of(encoder, struct intel_dvo, base.base);
93}
94
95static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
96{
97	return container_of(intel_attached_encoder(connector),
98			    struct intel_dvo, base);
99}
100
101static void intel_dvo_dpms(struct drm_encoder *encoder, int mode)
102{
103	struct drm_i915_private *dev_priv = encoder->dev->dev_private;
104	struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
105	u32 dvo_reg = intel_dvo->dev.dvo_reg;
106	u32 temp = I915_READ(dvo_reg);
107
108	if (mode == DRM_MODE_DPMS_ON) {
109		I915_WRITE(dvo_reg, temp | DVO_ENABLE);
110		I915_READ(dvo_reg);
111		intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, mode);
112	} else {
113		intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, mode);
114		I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
115		I915_READ(dvo_reg);
116	}
117}
118
119static int intel_dvo_mode_valid(struct drm_connector *connector,
120				struct drm_display_mode *mode)
121{
122	struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
123
124	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
125		return MODE_NO_DBLESCAN;
126
127	/* XXX: Validate clock range */
128
129	if (intel_dvo->panel_fixed_mode) {
130		if (mode->hdisplay > intel_dvo->panel_fixed_mode->hdisplay)
131			return MODE_PANEL;
132		if (mode->vdisplay > intel_dvo->panel_fixed_mode->vdisplay)
133			return MODE_PANEL;
134	}
135
136	return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
137}
138
139static bool intel_dvo_mode_fixup(struct drm_encoder *encoder,
140				 struct drm_display_mode *mode,
141				 struct drm_display_mode *adjusted_mode)
142{
143	struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
144
145	/* If we have timings from the BIOS for the panel, put them in
146	 * to the adjusted mode.  The CRTC will be set up for this mode,
147	 * with the panel scaling set up to source from the H/VDisplay
148	 * of the original mode.
149	 */
150	if (intel_dvo->panel_fixed_mode != NULL) {
151#define C(x) adjusted_mode->x = intel_dvo->panel_fixed_mode->x
152		C(hdisplay);
153		C(hsync_start);
154		C(hsync_end);
155		C(htotal);
156		C(vdisplay);
157		C(vsync_start);
158		C(vsync_end);
159		C(vtotal);
160		C(clock);
161		drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
162#undef C
163	}
164
165	if (intel_dvo->dev.dev_ops->mode_fixup)
166		return intel_dvo->dev.dev_ops->mode_fixup(&intel_dvo->dev, mode, adjusted_mode);
167
168	return true;
169}
170
171static void intel_dvo_mode_set(struct drm_encoder *encoder,
172			       struct drm_display_mode *mode,
173			       struct drm_display_mode *adjusted_mode)
174{
175	struct drm_device *dev = encoder->dev;
176	struct drm_i915_private *dev_priv = dev->dev_private;
177	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
178	struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
179	int pipe = intel_crtc->pipe;
180	u32 dvo_val;
181	u32 dvo_reg = intel_dvo->dev.dvo_reg, dvo_srcdim_reg;
182	int dpll_reg = (pipe == 0) ? DPLL_A : DPLL_B;
183
184	switch (dvo_reg) {
185	case DVOA:
186	default:
187		dvo_srcdim_reg = DVOA_SRCDIM;
188		break;
189	case DVOB:
190		dvo_srcdim_reg = DVOB_SRCDIM;
191		break;
192	case DVOC:
193		dvo_srcdim_reg = DVOC_SRCDIM;
194		break;
195	}
196
197	intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev, mode, adjusted_mode);
198
199	/* Save the data order, since I don't know what it should be set to. */
200	dvo_val = I915_READ(dvo_reg) &
201		  (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
202	dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
203		   DVO_BLANK_ACTIVE_HIGH;
204
205	if (pipe == 1)
206		dvo_val |= DVO_PIPE_B_SELECT;
207	dvo_val |= DVO_PIPE_STALL;
208	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
209		dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
210	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
211		dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
212
213	I915_WRITE(dpll_reg, I915_READ(dpll_reg) | DPLL_DVO_HIGH_SPEED);
214
215	/*I915_WRITE(DVOB_SRCDIM,
216	  (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
217	  (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
218	I915_WRITE(dvo_srcdim_reg,
219		   (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
220		   (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
221	/*I915_WRITE(DVOB, dvo_val);*/
222	I915_WRITE(dvo_reg, dvo_val);
223}
224
225/**
226 * Detect the output connection on our DVO device.
227 *
228 * Unimplemented.
229 */
230static enum drm_connector_status
231intel_dvo_detect(struct drm_connector *connector, bool force)
232{
233	struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
234	return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
235}
236
237static int intel_dvo_get_modes(struct drm_connector *connector)
238{
239	struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
240	struct drm_i915_private *dev_priv = connector->dev->dev_private;
241
242	/* We should probably have an i2c driver get_modes function for those
243	 * devices which will have a fixed set of modes determined by the chip
244	 * (TV-out, for example), but for now with just TMDS and LVDS,
245	 * that's not the case.
246	 */
247	intel_ddc_get_modes(connector,
248			    &dev_priv->gmbus[intel_dvo->ddc_bus].adapter);
249	if (!list_empty(&connector->probed_modes))
250		return 1;
251
252	if (intel_dvo->panel_fixed_mode != NULL) {
253		struct drm_display_mode *mode;
254		mode = drm_mode_duplicate(connector->dev, intel_dvo->panel_fixed_mode);
255		if (mode) {
256			drm_mode_probed_add(connector, mode);
257			return 1;
258		}
259	}
260
261	return 0;
262}
263
264static void intel_dvo_destroy(struct drm_connector *connector)
265{
266	drm_sysfs_connector_remove(connector);
267	drm_connector_cleanup(connector);
268	kfree(connector);
269}
270
271static const struct drm_encoder_helper_funcs intel_dvo_helper_funcs = {
272	.dpms = intel_dvo_dpms,
273	.mode_fixup = intel_dvo_mode_fixup,
274	.prepare = intel_encoder_prepare,
275	.mode_set = intel_dvo_mode_set,
276	.commit = intel_encoder_commit,
277};
278
279static const struct drm_connector_funcs intel_dvo_connector_funcs = {
280	.dpms = drm_helper_connector_dpms,
281	.detect = intel_dvo_detect,
282	.destroy = intel_dvo_destroy,
283	.fill_modes = drm_helper_probe_single_connector_modes,
284};
285
286static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
287	.mode_valid = intel_dvo_mode_valid,
288	.get_modes = intel_dvo_get_modes,
289	.best_encoder = intel_best_encoder,
290};
291
292static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
293{
294	struct intel_dvo *intel_dvo = enc_to_intel_dvo(encoder);
295
296	if (intel_dvo->dev.dev_ops->destroy)
297		intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);
298
299	kfree(intel_dvo->panel_fixed_mode);
300
301	intel_encoder_destroy(encoder);
302}
303
304static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
305	.destroy = intel_dvo_enc_destroy,
306};
307
308/**
309 * Attempts to get a fixed panel timing for LVDS (currently only the i830).
310 *
311 * Other chips with DVO LVDS will need to extend this to deal with the LVDS
312 * chip being on DVOB/C and having multiple pipes.
313 */
314static struct drm_display_mode *
315intel_dvo_get_current_mode(struct drm_connector *connector)
316{
317	struct drm_device *dev = connector->dev;
318	struct drm_i915_private *dev_priv = dev->dev_private;
319	struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
320	uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
321	struct drm_display_mode *mode = NULL;
322
323	/* If the DVO port is active, that'll be the LVDS, so we can pull out
324	 * its timings to get how the BIOS set up the panel.
325	 */
326	if (dvo_val & DVO_ENABLE) {
327		struct drm_crtc *crtc;
328		int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
329
330		crtc = intel_get_crtc_for_pipe(dev, pipe);
331		if (crtc) {
332			mode = intel_crtc_mode_get(dev, crtc);
333			if (mode) {
334				mode->type |= DRM_MODE_TYPE_PREFERRED;
335				if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
336					mode->flags |= DRM_MODE_FLAG_PHSYNC;
337				if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
338					mode->flags |= DRM_MODE_FLAG_PVSYNC;
339			}
340		}
341	}
342
343	return mode;
344}
345
346void intel_dvo_init(struct drm_device *dev)
347{
348	struct drm_i915_private *dev_priv = dev->dev_private;
349	struct intel_encoder *intel_encoder;
350	struct intel_dvo *intel_dvo;
351	struct intel_connector *intel_connector;
352	int ret = 0;
353	int i;
354	int encoder_type = DRM_MODE_ENCODER_NONE;
355
356	intel_dvo = kzalloc(sizeof(struct intel_dvo), GFP_KERNEL);
357	if (!intel_dvo)
358		return;
359
360	intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
361	if (!intel_connector) {
362		kfree(intel_dvo);
363		return;
364	}
365
366	intel_encoder = &intel_dvo->base;
367	drm_encoder_init(dev, &intel_encoder->base,
368			 &intel_dvo_enc_funcs, encoder_type);
369
370	/* Set up the DDC bus */
371	intel_dvo->ddc_bus = GMBUS_PORT_DPB;
372
373	/* Now, try to find a controller */
374	for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
375		struct drm_connector *connector = &intel_connector->base;
376		const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
377		struct i2c_adapter *i2c;
378		int gpio;
379
380		/* Allow the I2C driver info to specify the GPIO to be used in
381		 * special cases, but otherwise default to what's defined
382		 * in the spec.
383		 */
384		if (dvo->gpio != 0)
385			gpio = dvo->gpio;
386		else if (dvo->type == INTEL_DVO_CHIP_LVDS)
387			gpio = GMBUS_PORT_PANEL;
388		else
389			gpio = GMBUS_PORT_DPB;
390
391		/* Set up the I2C bus necessary for the chip we're probing.
392		 * It appears that everything is on GPIOE except for panels
393		 * on i830 laptops, which are on GPIOB (DVOA).
394		 */
395		i2c = &dev_priv->gmbus[gpio].adapter;
396
397		intel_dvo->dev = *dvo;
398		ret = dvo->dev_ops->init(&intel_dvo->dev, i2c);
399		if (!ret)
400			continue;
401
402		intel_encoder->type = INTEL_OUTPUT_DVO;
403		intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
404		switch (dvo->type) {
405		case INTEL_DVO_CHIP_TMDS:
406			intel_encoder->clone_mask =
407				(1 << INTEL_DVO_TMDS_CLONE_BIT) |
408				(1 << INTEL_ANALOG_CLONE_BIT);
409			drm_connector_init(dev, connector,
410					   &intel_dvo_connector_funcs,
411					   DRM_MODE_CONNECTOR_DVII);
412			encoder_type = DRM_MODE_ENCODER_TMDS;
413			break;
414		case INTEL_DVO_CHIP_LVDS:
415			intel_encoder->clone_mask =
416				(1 << INTEL_DVO_LVDS_CLONE_BIT);
417			drm_connector_init(dev, connector,
418					   &intel_dvo_connector_funcs,
419					   DRM_MODE_CONNECTOR_LVDS);
420			encoder_type = DRM_MODE_ENCODER_LVDS;
421			break;
422		}
423
424		drm_connector_helper_add(connector,
425					 &intel_dvo_connector_helper_funcs);
426		connector->display_info.subpixel_order = SubPixelHorizontalRGB;
427		connector->interlace_allowed = false;
428		connector->doublescan_allowed = false;
429
430		drm_encoder_helper_add(&intel_encoder->base,
431				       &intel_dvo_helper_funcs);
432
433		intel_connector_attach_encoder(intel_connector, intel_encoder);
434		if (dvo->type == INTEL_DVO_CHIP_LVDS) {
435			/* For our LVDS chipsets, we should hopefully be able
436			 * to dig the fixed panel mode out of the BIOS data.
437			 * However, it's in a different format from the BIOS
438			 * data on chipsets with integrated LVDS (stored in AIM
439			 * headers, likely), so for now, just get the current
440			 * mode being output through DVO.
441			 */
442			intel_dvo->panel_fixed_mode =
443				intel_dvo_get_current_mode(connector);
444			intel_dvo->panel_wants_dither = true;
445		}
446
447		drm_sysfs_connector_add(connector);
448		return;
449	}
450
451	drm_encoder_cleanup(&intel_encoder->base);
452	kfree(intel_dvo);
453	kfree(intel_connector);
454}
455