1 // SPDX-License-Identifier: GPL-2.0-only
7  * DOC: VC4 DPI module
9  * The VC4 DPI hardware supports MIPI DPI type 4 and Nokia ViSSI
10  * signals.  On BCM2835, these can be routed out to GPIO0-27 with the
24 #include <linux/media-bus-format.h>
43 /* The format field takes the ORDER-shuffled pixel valve data and
79 /* Power gate to the device, full reset at 0 -> 1 transition */
86 /* General DPI hardware state. */
106 		readl(dpi->regs + (offset));						\
112 		writel(val, dpi->regs + (offset));					\
122 	struct drm_device *dev = encoder->dev;  in vc4_dpi_encoder_disable()
123 	struct vc4_dpi *dpi = to_vc4_dpi(encoder);  in vc4_dpi_encoder_disable()  local
129 	clk_disable_unprepare(dpi->pixel_clock);  in vc4_dpi_encoder_disable()
136 	struct drm_device *dev = encoder->dev;  in vc4_dpi_encoder_enable()
137 	struct drm_display_mode *mode = &encoder->crtc->mode;  in vc4_dpi_encoder_enable()
138 	struct vc4_dpi *dpi = to_vc4_dpi(encoder);  in vc4_dpi_encoder_enable()  local
145 	/* Look up the connector attached to DPI so we can get the  in vc4_dpi_encoder_enable()
152 		if (connector_scan->encoder == encoder) {  in vc4_dpi_encoder_enable()
163 		if (connector->display_info.num_bus_formats) {  in vc4_dpi_encoder_enable()
164 			u32 bus_format = connector->display_info.bus_formats[0];  in vc4_dpi_encoder_enable()
208 		if (connector->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)  in vc4_dpi_encoder_enable()
211 		if (connector->display_info.bus_flags & DRM_BUS_FLAG_DE_LOW)  in vc4_dpi_encoder_enable()
215 	if (mode->flags & DRM_MODE_FLAG_CSYNC) {  in vc4_dpi_encoder_enable()
216 		if (mode->flags & DRM_MODE_FLAG_NCSYNC)  in vc4_dpi_encoder_enable()
221 		if (mode->flags & DRM_MODE_FLAG_NHSYNC)  in vc4_dpi_encoder_enable()
223 		else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))  in vc4_dpi_encoder_enable()
226 		if (mode->flags & DRM_MODE_FLAG_NVSYNC)  in vc4_dpi_encoder_enable()
228 		else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))  in vc4_dpi_encoder_enable()
237 	ret = clk_set_rate(dpi->pixel_clock, mode->clock * 1000);  in vc4_dpi_encoder_enable()
241 	ret = clk_prepare_enable(dpi->pixel_clock);  in vc4_dpi_encoder_enable()
251 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)  in vc4_dpi_encoder_mode_valid()
265 	struct drm_device *drm = encoder->dev;  in vc4_dpi_late_register()
266 	struct vc4_dpi *dpi = to_vc4_dpi(encoder);  in vc4_dpi_late_register()  local
268 	vc4_debugfs_add_regset32(drm, "dpi_regs", &dpi->regset);  in vc4_dpi_late_register()
278 	{ .compatible = "brcm,bcm2835-dpi", .data = NULL },
282 /* Sets up the next link in the display chain, whether it's a panel or
285 static int vc4_dpi_init_bridge(struct vc4_dpi *dpi)  in vc4_dpi_init_bridge()  argument
287 	struct drm_device *drm = dpi->encoder.base.dev;  in vc4_dpi_init_bridge()
288 	struct device *dev = &dpi->pdev->dev;  in vc4_dpi_init_bridge()
291 	bridge = drmm_of_get_bridge(drm, dev->of_node, 0, 0);  in vc4_dpi_init_bridge()
296 		if (PTR_ERR(bridge) == -ENODEV)  in vc4_dpi_init_bridge()
302 	return drm_bridge_attach(&dpi->encoder.base, bridge, NULL, 0);  in vc4_dpi_init_bridge()
307 	struct vc4_dpi *dpi = ptr;  in vc4_dpi_disable_clock()  local
309 	clk_disable_unprepare(dpi->core_clock);  in vc4_dpi_disable_clock()
316 	struct vc4_dpi *dpi;  in vc4_dpi_bind()  local
319 	dpi = drmm_kzalloc(drm, sizeof(*dpi), GFP_KERNEL);  in vc4_dpi_bind()
320 	if (!dpi)  in vc4_dpi_bind()
321 		return -ENOMEM;  in vc4_dpi_bind()
323 	dpi->encoder.type = VC4_ENCODER_TYPE_DPI;  in vc4_dpi_bind()
324 	dpi->pdev = pdev;  in vc4_dpi_bind()
325 	dpi->regs = vc4_ioremap_regs(pdev, 0);  in vc4_dpi_bind()
326 	if (IS_ERR(dpi->regs))  in vc4_dpi_bind()
327 		return PTR_ERR(dpi->regs);  in vc4_dpi_bind()
328 	dpi->regset.base = dpi->regs;  in vc4_dpi_bind()
329 	dpi->regset.regs = dpi_regs;  in vc4_dpi_bind()
330 	dpi->regset.nregs = ARRAY_SIZE(dpi_regs);  in vc4_dpi_bind()
335 		return -ENODEV;  in vc4_dpi_bind()
338 	dpi->core_clock = devm_clk_get(dev, "core");  in vc4_dpi_bind()
339 	if (IS_ERR(dpi->core_clock)) {  in vc4_dpi_bind()
340 		ret = PTR_ERR(dpi->core_clock);  in vc4_dpi_bind()
341 		if (ret != -EPROBE_DEFER)  in vc4_dpi_bind()
346 	dpi->pixel_clock = devm_clk_get(dev, "pixel");  in vc4_dpi_bind()
347 	if (IS_ERR(dpi->pixel_clock)) {  in vc4_dpi_bind()
348 		ret = PTR_ERR(dpi->pixel_clock);  in vc4_dpi_bind()
349 		if (ret != -EPROBE_DEFER)  in vc4_dpi_bind()
354 	ret = clk_prepare_enable(dpi->core_clock);  in vc4_dpi_bind()
360 	ret = devm_add_action_or_reset(dev, vc4_dpi_disable_clock, dpi);  in vc4_dpi_bind()
364 	ret = drmm_encoder_init(drm, &dpi->encoder.base,  in vc4_dpi_bind()
371 	drm_encoder_helper_add(&dpi->encoder.base, &vc4_dpi_encoder_helper_funcs);  in vc4_dpi_bind()
373 	ret = vc4_dpi_init_bridge(dpi);  in vc4_dpi_bind()
377 	dev_set_drvdata(dev, dpi);  in vc4_dpi_bind()
388 	return component_add(&pdev->dev, &vc4_dpi_ops);  in vc4_dpi_dev_probe()
393 	component_del(&pdev->dev, &vc4_dpi_ops);  in vc4_dpi_dev_remove()