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
64 /* 0 = right-to-left, 1 = left-to-right (default), horizontal flip */
66 /* 0 = down-to-up, 1 = up-to-down (default), vertical flip  */
127 /* Formula A for YCbCR->RGB = 0, Formula B = 1 */
140 #define ILI9322_GLOBAL_RESET_ASSERT	0x00 /* bit 0 = 0 -> reset */
144  * Upper nybble, bits 4-7 are negative gamma
145  * Lower nybble, bits 0-3 are positive gamma
157  * enum ili9322_input - the format of the incoming signal to the panel
160  * be selected by electronic straps on the display. However it is possible
161  * to select another mode or override the electronic default with this
181 	"8 bit serial RGB through",
182 	"8 bit serial RGB aligned",
183 	"8 bit serial RGB dummy 320x240",
184 	"8 bit serial RGB dummy 360x240",
191 	"8 bit ITU-R BT.656 720Y 360CbCr",
192 	"8 bit ITU-R BT.656 640Y 320CbCr",
196  * struct ili9322_config - the system specific ILI9322 configuration
199  * @flip_horizontal: flip the image horizontally (right-to-left scan)
201  * @flip_vertical: flip the image vertically (down-to-up scan)
214  * peak-to-peak amplitude of the communcation signals to the physical
243  *  +----------------------------------------------------------->
330 	/* Just register 0 is read-only */  in ili9322_writeable_reg()
351 	ret = regmap_write(ili->regmap, ILI9322_GLOBAL_RESET,  in ili9322_init()
354 		dev_err(ili->dev, "can't issue GRESET (%d)\n", ret);  in ili9322_init()
359 	if (ili->vreg1out != U8_MAX) {  in ili9322_init()
360 		ret = regmap_write(ili->regmap, ILI9322_VREG1_VOLTAGE,  in ili9322_init()
361 				   ili->vreg1out);  in ili9322_init()
363 			dev_err(ili->dev, "can't set up VREG1OUT (%d)\n", ret);  in ili9322_init()
368 	if (ili->vcom_amplitude != U8_MAX) {  in ili9322_init()
369 		ret = regmap_write(ili->regmap, ILI9322_VCOM_AMP,  in ili9322_init()
370 				   ili->vcom_amplitude);  in ili9322_init()
372 			dev_err(ili->dev,  in ili9322_init()
378 	if (ili->vcom_high != U8_MAX) {  in ili9322_init()
379 		ret = regmap_write(ili->regmap, ILI9322_VCOM_HIGH,  in ili9322_init()
380 				   ili->vcom_high);  in ili9322_init()
382 			dev_err(ili->dev, "can't set up VCOM high (%d)\n", ret);  in ili9322_init()
388 	for (i = 0; i < ARRAY_SIZE(ili->gamma); i++) {  in ili9322_init()
389 		ret = regmap_write(ili->regmap, ILI9322_GAMMA_1 + i,  in ili9322_init()
390 				   ili->gamma[i]);  in ili9322_init()
392 			dev_err(ili->dev,  in ili9322_init()
404 	if (ili->conf->dclk_active_high)  in ili9322_init()
406 	if (ili->conf->de_active_high)  in ili9322_init()
408 	if (ili->conf->hsync_active_high)  in ili9322_init()
410 	if (ili->conf->vsync_active_high)  in ili9322_init()
412 	ret = regmap_write(ili->regmap, ILI9322_POL, reg);  in ili9322_init()
414 		dev_err(ili->dev, "can't write POL register (%d)\n", ret);  in ili9322_init()
422 	reg = ili->conf->syncmode;  in ili9322_init()
424 	ret = regmap_write(ili->regmap, ILI9322_IF_CTRL, reg);  in ili9322_init()
426 		dev_err(ili->dev, "can't write IF CTRL register (%d)\n", ret);  in ili9322_init()
431 	reg = (ili->input << 4);  in ili9322_init()
433 	if (!ili->conf->flip_horizontal)  in ili9322_init()
435 	if (!ili->conf->flip_vertical)  in ili9322_init()
438 	ret = regmap_write(ili->regmap, ILI9322_ENTRY, reg);  in ili9322_init()
440 		dev_err(ili->dev, "can't write ENTRY reg (%d)\n", ret);  in ili9322_init()
443 	dev_info(ili->dev, "display is in %s mode, syncmode %02x\n",  in ili9322_init()
444 		 ili9322_inputs[ili->input],  in ili9322_init()
445 		 ili->conf->syncmode);  in ili9322_init()
447 	dev_info(ili->dev, "initialized display\n");  in ili9322_init()
453  * This power-on sequence if from the datasheet, page 57.
460 	gpiod_set_value(ili->reset_gpio, 1);  in ili9322_power_on()
462 	ret = regulator_bulk_enable(ARRAY_SIZE(ili->supplies), ili->supplies);  in ili9322_power_on()
464 		dev_err(ili->dev, "unable to enable regulators\n");  in ili9322_power_on()
469 	/* De-assert RESET */  in ili9322_power_on()
470 	gpiod_set_value(ili->reset_gpio, 0);  in ili9322_power_on()
479 	return regulator_bulk_disable(ARRAY_SIZE(ili->supplies), ili->supplies);  in ili9322_power_off()
487 	ret = regmap_write(ili->regmap, ILI9322_POW_CTRL,  in ili9322_disable()
490 		dev_err(ili->dev, "unable to go to standby mode\n");  in ili9322_disable()
525 	ret = regmap_write(ili->regmap, ILI9322_POW_CTRL,  in ili9322_enable()
528 		dev_err(ili->dev, "unable to enable panel\n");  in ili9322_enable()
535 /* Serial RGB modes */
635 	struct drm_device *drm = connector->dev;  in ili9322_get_modes()
639 	info = &connector->display_info;  in ili9322_get_modes()
640 	info->width_mm = ili->conf->width_mm;  in ili9322_get_modes()
641 	info->height_mm = ili->conf->height_mm;  in ili9322_get_modes()
642 	if (ili->conf->dclk_active_high)  in ili9322_get_modes()
643 		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;  in ili9322_get_modes()
645 		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;  in ili9322_get_modes()
647 	if (ili->conf->de_active_high)  in ili9322_get_modes()
648 		info->bus_flags |= DRM_BUS_FLAG_DE_HIGH;  in ili9322_get_modes()
650 		info->bus_flags |= DRM_BUS_FLAG_DE_LOW;  in ili9322_get_modes()
652 	switch (ili->input) {  in ili9322_get_modes()
680 		dev_err(panel->dev, "bad mode or failed to add mode\n");  in ili9322_get_modes()
681 		return -EINVAL;  in ili9322_get_modes()
688 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;  in ili9322_get_modes()
691 	if (ili->conf->hsync_active_high)  in ili9322_get_modes()
692 		mode->flags |= DRM_MODE_FLAG_PHSYNC;  in ili9322_get_modes()
694 		mode->flags |= DRM_MODE_FLAG_NHSYNC;  in ili9322_get_modes()
695 	if (ili->conf->vsync_active_high)  in ili9322_get_modes()
696 		mode->flags |= DRM_MODE_FLAG_PVSYNC;  in ili9322_get_modes()
698 		mode->flags |= DRM_MODE_FLAG_NVSYNC;  in ili9322_get_modes()
700 	mode->width_mm = ili->conf->width_mm;  in ili9322_get_modes()
701 	mode->height_mm = ili->conf->height_mm;  in ili9322_get_modes()
704 	return 1; /* Number of modes */  in ili9322_get_modes()
717 	struct device *dev = &spi->dev;  in ili9322_probe()
727 		return -ENOMEM;  in ili9322_probe()
731 	ili->dev = dev;  in ili9322_probe()
737 	ili->conf = of_device_get_match_data(dev);  in ili9322_probe()
738 	if (!ili->conf) {  in ili9322_probe()
740 		return -ENODEV;  in ili9322_probe()
743 	val = ili->conf->vreg1out_mv;  in ili9322_probe()
746 		ili->vreg1out = U8_MAX;  in ili9322_probe()
750 			return -EINVAL;  in ili9322_probe()
754 			return -EINVAL;  in ili9322_probe()
758 			return -EINVAL;  in ili9322_probe()
760 		val -= 3600;  in ili9322_probe()
763 		ili->vreg1out = val;  in ili9322_probe()
766 	val = ili->conf->vcom_high_percent;  in ili9322_probe()
769 		ili->vcom_high = U8_MAX;  in ili9322_probe()
773 			return -EINVAL;  in ili9322_probe()
777 			return -EINVAL;  in ili9322_probe()
779 		val -= 37;  in ili9322_probe()
781 		ili->vcom_high = val;  in ili9322_probe()
784 	val = ili->conf->vcom_amplitude_percent;  in ili9322_probe()
787 		ili->vcom_high = U8_MAX;  in ili9322_probe()
791 			return -EINVAL;  in ili9322_probe()
795 			return -EINVAL;  in ili9322_probe()
797 		val -= 70;  in ili9322_probe()
800 		ili->vcom_amplitude = val;  in ili9322_probe()
803 	for (i = 0; i < ARRAY_SIZE(ili->gamma); i++) {  in ili9322_probe()
804 		val = ili->conf->gamma_corr_neg[i];  in ili9322_probe()
810 		val = ili->conf->gamma_corr_pos[i];  in ili9322_probe()
816 		ili->gamma[i] = gamma;  in ili9322_probe()
820 	ili->supplies[0].supply = "vcc"; /* 2.7-3.6 V */  in ili9322_probe()
821 	ili->supplies[1].supply = "iovcc"; /* 1.65-3.6V */  in ili9322_probe()
822 	ili->supplies[2].supply = "vci"; /* 2.7-3.6V */  in ili9322_probe()
823 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ili->supplies),  in ili9322_probe()
824 				      ili->supplies);  in ili9322_probe()
827 	ret = regulator_set_voltage(ili->supplies[0].consumer,  in ili9322_probe()
831 	ret = regulator_set_voltage(ili->supplies[1].consumer,  in ili9322_probe()
835 	ret = regulator_set_voltage(ili->supplies[2].consumer,  in ili9322_probe()
840 	ili->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);  in ili9322_probe()
841 	if (IS_ERR(ili->reset_gpio)) {  in ili9322_probe()
843 		return PTR_ERR(ili->reset_gpio);  in ili9322_probe()
846 	spi->bits_per_word = 8;  in ili9322_probe()
853 	ili->regmap = devm_regmap_init(dev, &ili9322_regmap_bus, dev,  in ili9322_probe()
855 	if (IS_ERR(ili->regmap)) {  in ili9322_probe()
857 		return PTR_ERR(ili->regmap);  in ili9322_probe()
860 	ret = regmap_read(ili->regmap, ILI9322_CHIP_ID, &val);  in ili9322_probe()
868 		return -ENODEV;  in ili9322_probe()
872 	if (ili->conf->input == ILI9322_INPUT_UNKNOWN) {  in ili9322_probe()
873 		ret = regmap_read(ili->regmap, ILI9322_ENTRY, &val);  in ili9322_probe()
879 		ili->input = (val >> 4) & 0x0f;  in ili9322_probe()
880 		if (ili->input >= ILI9322_INPUT_UNKNOWN)  in ili9322_probe()
881 			ili->input = ILI9322_INPUT_UNKNOWN;  in ili9322_probe()
883 		ili->input = ili->conf->input;  in ili9322_probe()
886 	drm_panel_init(&ili->panel, dev, &ili9322_drm_funcs,  in ili9322_probe()
889 	drm_panel_add(&ili->panel);  in ili9322_probe()
899 	drm_panel_remove(&ili->panel);  in ili9322_remove()
903  * The D-Link DIR-685 panel is marked LM918A01-1A SY-B4-091116-E0199
920 		.compatible = "dlink,dir-685-panel",
935 		.name = "panel-ilitek-ili9322",