1 // SPDX-License-Identifier: GPL-2.0-only
5  * This panel can be configured to support:
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
159  * The panel can be connected to various input streams and four of them can
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
197  * @width_mm: physical panel width [mm]
198  * @height_mm: physical panel height [mm]
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  *  +----------------------------------------------------------->
273 	struct drm_panel panel;  member
285 static inline struct ili9322 *panel_to_ili9322(struct drm_panel *panel)  in panel_to_ili9322()  argument
287 	return container_of(panel, struct ili9322, panel);  in panel_to_ili9322()
330 	/* Just register 0 is read-only */  in ili9322_writeable_reg()
344 static int ili9322_init(struct drm_panel *panel, struct ili9322 *ili)  in ili9322_init()  argument
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()
482 static int ili9322_disable(struct drm_panel *panel)  in ili9322_disable()  argument
484 	struct ili9322 *ili = panel_to_ili9322(panel);  in ili9322_disable()
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()
497 static int ili9322_unprepare(struct drm_panel *panel)  in ili9322_unprepare()  argument
499 	struct ili9322 *ili = panel_to_ili9322(panel);  in ili9322_unprepare()
504 static int ili9322_prepare(struct drm_panel *panel)  in ili9322_prepare()  argument
506 	struct ili9322 *ili = panel_to_ili9322(panel);  in ili9322_prepare()
513 	ret = ili9322_init(panel, ili);  in ili9322_prepare()
515 		ili9322_unprepare(panel);  in ili9322_prepare()
520 static int ili9322_enable(struct drm_panel *panel)  in ili9322_enable()  argument
522 	struct ili9322 *ili = panel_to_ili9322(panel);  in ili9322_enable()
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()
631 static int ili9322_get_modes(struct drm_panel *panel,  in ili9322_get_modes()  argument
634 	struct ili9322 *ili = panel_to_ili9322(panel);  in ili9322_get_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()
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",
942 MODULE_DESCRIPTION("ILI9322 LCD panel driver");