1 // SPDX-License-Identifier: GPL-2.0-only
6  * - 8-bit serial RGB interface
7  * - 24-bit parallel RGB interface
8  * - 8-bit ITU-R BT.601 interface
9  * - 8-bit ITU-R BT.656 interface
10  * - Up to 320RGBx240 dots resolution TFT LCD displays
11  * - Scaling, brightness and contrast
19  * Derived from drivers/drm/gpu/panel/panel-samsung-ld9040.c
63 /* 0 = right-to-left, 1 = left-to-right (default), horizontal flip */
65 /* 0 = down-to-up, 1 = up-to-down (default), vertical flip  */
126 /* Formula A for YCbCR->RGB = 0, Formula B = 1 */
139 #define ILI9322_GLOBAL_RESET_ASSERT	0x00 /* bit 0 = 0 -> reset */
143  * Upper nybble, bits 4-7 are negative gamma
144  * Lower nybble, bits 0-3 are positive gamma
156  * enum ili9322_input - the format of the incoming signal to the panel
190 	"8 bit ITU-R BT.656 720Y 360CbCr",
191 	"8 bit ITU-R BT.656 640Y 320CbCr",
195  * struct ili9322_config - the system specific ILI9322 configuration
198  * @flip_horizontal: flip the image horizontally (right-to-left scan)
200  * @flip_vertical: flip the image vertically (down-to-up scan)
213  * peak-to-peak amplitude of the communcation signals to the physical
242  *  +----------------------------------------------------------->
334 	/* Just register 0 is read-only */  in ili9322_writeable_reg()
356 	ret = regmap_write(ili->regmap, ILI9322_GLOBAL_RESET,  in ili9322_init()
359 		dev_err(ili->dev, "can't issue GRESET (%d)\n", ret);  in ili9322_init()
364 	if (ili->vreg1out != U8_MAX) {  in ili9322_init()
365 		ret = regmap_write(ili->regmap, ILI9322_VREG1_VOLTAGE,  in ili9322_init()
366 				   ili->vreg1out);  in ili9322_init()
368 			dev_err(ili->dev, "can't set up VREG1OUT (%d)\n", ret);  in ili9322_init()
373 	if (ili->vcom_amplitude != U8_MAX) {  in ili9322_init()
374 		ret = regmap_write(ili->regmap, ILI9322_VCOM_AMP,  in ili9322_init()
375 				   ili->vcom_amplitude);  in ili9322_init()
377 			dev_err(ili->dev,  in ili9322_init()
383 	if (ili->vcom_high != U8_MAX) {  in ili9322_init()
384 		ret = regmap_write(ili->regmap, ILI9322_VCOM_HIGH,  in ili9322_init()
385 				   ili->vcom_high);  in ili9322_init()
387 			dev_err(ili->dev, "can't set up VCOM high (%d)\n", ret);  in ili9322_init()
393 	for (i = 0; i < ARRAY_SIZE(ili->gamma); i++) {  in ili9322_init()
394 		ret = regmap_write(ili->regmap, ILI9322_GAMMA_1 + i,  in ili9322_init()
395 				   ili->gamma[i]);  in ili9322_init()
397 			dev_err(ili->dev,  in ili9322_init()
409 	if (ili->conf->dclk_active_high)  in ili9322_init()
411 	if (ili->conf->de_active_high)  in ili9322_init()
413 	if (ili->conf->hsync_active_high)  in ili9322_init()
415 	if (ili->conf->vsync_active_high)  in ili9322_init()
417 	ret = regmap_write(ili->regmap, ILI9322_POL, reg);  in ili9322_init()
419 		dev_err(ili->dev, "can't write POL register (%d)\n", ret);  in ili9322_init()
427 	reg = ili->conf->syncmode;  in ili9322_init()
429 	ret = regmap_write(ili->regmap, ILI9322_IF_CTRL, reg);  in ili9322_init()
431 		dev_err(ili->dev, "can't write IF CTRL register (%d)\n", ret);  in ili9322_init()
436 	reg = (ili->input << 4);  in ili9322_init()
438 	if (!ili->conf->flip_horizontal)  in ili9322_init()
440 	if (!ili->conf->flip_vertical)  in ili9322_init()
443 	ret = regmap_write(ili->regmap, ILI9322_ENTRY, reg);  in ili9322_init()
445 		dev_err(ili->dev, "can't write ENTRY reg (%d)\n", ret);  in ili9322_init()
448 	dev_info(ili->dev, "display is in %s mode, syncmode %02x\n",  in ili9322_init()
449 		 ili9322_inputs[ili->input],  in ili9322_init()
450 		 ili->conf->syncmode);  in ili9322_init()
452 	dev_info(ili->dev, "initialized display\n");  in ili9322_init()
458  * This power-on sequence if from the datasheet, page 57.
465 	gpiod_set_value(ili->reset_gpio, 1);  in ili9322_power_on()
467 	ret = regulator_bulk_enable(ARRAY_SIZE(ili->supplies), ili->supplies);  in ili9322_power_on()
469 		dev_err(ili->dev, "unable to enable regulators\n");  in ili9322_power_on()
474 	/* De-assert RESET */  in ili9322_power_on()
475 	gpiod_set_value(ili->reset_gpio, 0);  in ili9322_power_on()
484 	return regulator_bulk_disable(ARRAY_SIZE(ili->supplies), ili->supplies);  in ili9322_power_off()
492 	ret = regmap_write(ili->regmap, ILI9322_POW_CTRL,  in ili9322_disable()
495 		dev_err(ili->dev, "unable to go to standby mode\n");  in ili9322_disable()
530 	ret = regmap_write(ili->regmap, ILI9322_POW_CTRL,  in ili9322_enable()
533 		dev_err(ili->dev, "unable to enable panel\n");  in ili9322_enable()
640 	struct drm_device *drm = connector->dev;  in ili9322_get_modes()
644 	info = &connector->display_info;  in ili9322_get_modes()
645 	info->width_mm = ili->conf->width_mm;  in ili9322_get_modes()
646 	info->height_mm = ili->conf->height_mm;  in ili9322_get_modes()
647 	if (ili->conf->dclk_active_high)  in ili9322_get_modes()
648 		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;  in ili9322_get_modes()
650 		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;  in ili9322_get_modes()
652 	if (ili->conf->de_active_high)  in ili9322_get_modes()
653 		info->bus_flags |= DRM_BUS_FLAG_DE_HIGH;  in ili9322_get_modes()
655 		info->bus_flags |= DRM_BUS_FLAG_DE_LOW;  in ili9322_get_modes()
657 	switch (ili->input) {  in ili9322_get_modes()
685 		dev_err(panel->dev, "bad mode or failed to add mode\n");  in ili9322_get_modes()
686 		return -EINVAL;  in ili9322_get_modes()
693 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;  in ili9322_get_modes()
696 	if (ili->conf->hsync_active_high)  in ili9322_get_modes()
697 		mode->flags |= DRM_MODE_FLAG_PHSYNC;  in ili9322_get_modes()
699 		mode->flags |= DRM_MODE_FLAG_NHSYNC;  in ili9322_get_modes()
700 	if (ili->conf->vsync_active_high)  in ili9322_get_modes()
701 		mode->flags |= DRM_MODE_FLAG_PVSYNC;  in ili9322_get_modes()
703 		mode->flags |= DRM_MODE_FLAG_NVSYNC;  in ili9322_get_modes()
705 	mode->width_mm = ili->conf->width_mm;  in ili9322_get_modes()
706 	mode->height_mm = ili->conf->height_mm;  in ili9322_get_modes()
722 	struct device *dev = &spi->dev;  in ili9322_probe()
732 		return -ENOMEM;  in ili9322_probe()
736 	ili->dev = dev;  in ili9322_probe()
742 	ili->conf = of_device_get_match_data(dev);  in ili9322_probe()
743 	if (!ili->conf) {  in ili9322_probe()
745 		return -ENODEV;  in ili9322_probe()
748 	val = ili->conf->vreg1out_mv;  in ili9322_probe()
751 		ili->vreg1out = U8_MAX;  in ili9322_probe()
755 			return -EINVAL;  in ili9322_probe()
759 			return -EINVAL;  in ili9322_probe()
763 			return -EINVAL;  in ili9322_probe()
765 		val -= 3600;  in ili9322_probe()
768 		ili->vreg1out = val;  in ili9322_probe()
771 	val = ili->conf->vcom_high_percent;  in ili9322_probe()
774 		ili->vcom_high = U8_MAX;  in ili9322_probe()
778 			return -EINVAL;  in ili9322_probe()
782 			return -EINVAL;  in ili9322_probe()
784 		val -= 37;  in ili9322_probe()
786 		ili->vcom_high = val;  in ili9322_probe()
789 	val = ili->conf->vcom_amplitude_percent;  in ili9322_probe()
792 		ili->vcom_high = U8_MAX;  in ili9322_probe()
796 			return -EINVAL;  in ili9322_probe()
800 			return -EINVAL;  in ili9322_probe()
802 		val -= 70;  in ili9322_probe()
805 		ili->vcom_amplitude = val;  in ili9322_probe()
808 	for (i = 0; i < ARRAY_SIZE(ili->gamma); i++) {  in ili9322_probe()
809 		val = ili->conf->gamma_corr_neg[i];  in ili9322_probe()
815 		val = ili->conf->gamma_corr_pos[i];  in ili9322_probe()
821 		ili->gamma[i] = gamma;  in ili9322_probe()
825 	ili->supplies[0].supply = "vcc"; /* 2.7-3.6 V */  in ili9322_probe()
826 	ili->supplies[1].supply = "iovcc"; /* 1.65-3.6V */  in ili9322_probe()
827 	ili->supplies[2].supply = "vci"; /* 2.7-3.6V */  in ili9322_probe()
828 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ili->supplies),  in ili9322_probe()
829 				      ili->supplies);  in ili9322_probe()
832 	ret = regulator_set_voltage(ili->supplies[0].consumer,  in ili9322_probe()
836 	ret = regulator_set_voltage(ili->supplies[1].consumer,  in ili9322_probe()
840 	ret = regulator_set_voltage(ili->supplies[2].consumer,  in ili9322_probe()
845 	ili->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);  in ili9322_probe()
846 	if (IS_ERR(ili->reset_gpio)) {  in ili9322_probe()
848 		return PTR_ERR(ili->reset_gpio);  in ili9322_probe()
851 	spi->bits_per_word = 8;  in ili9322_probe()
858 	ili->regmap = devm_regmap_init(dev, &ili9322_regmap_bus, dev,  in ili9322_probe()
860 	if (IS_ERR(ili->regmap)) {  in ili9322_probe()
862 		return PTR_ERR(ili->regmap);  in ili9322_probe()
865 	ret = regmap_read(ili->regmap, ILI9322_CHIP_ID, &val);  in ili9322_probe()
873 		return -ENODEV;  in ili9322_probe()
877 	if (ili->conf->input == ILI9322_INPUT_UNKNOWN) {  in ili9322_probe()
878 		ret = regmap_read(ili->regmap, ILI9322_ENTRY, &val);  in ili9322_probe()
884 		ili->input = (val >> 4) & 0x0f;  in ili9322_probe()
885 		if (ili->input >= ILI9322_INPUT_UNKNOWN)  in ili9322_probe()
886 			ili->input = ILI9322_INPUT_UNKNOWN;  in ili9322_probe()
888 		ili->input = ili->conf->input;  in ili9322_probe()
891 	drm_panel_init(&ili->panel, dev, &ili9322_drm_funcs,  in ili9322_probe()
894 	drm_panel_add(&ili->panel);  in ili9322_probe()
904 	drm_panel_remove(&ili->panel);  in ili9322_remove()
910  * The D-Link DIR-685 panel is marked LM918A01-1A SY-B4-091116-E0199
927 		.compatible = "dlink,dir-685-panel",
942 		.name = "panel-ilitek-ili9322",