452 lines
10 KiB
C
452 lines
10 KiB
C
/*
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* Copyright (C) 2014 NVIDIA Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/backlight.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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#include <video/mipi_display.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_device.h>
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#include <drm/drm_mipi_dsi.h>
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#include <drm/drm_panel.h>
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struct sharp_panel {
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struct drm_panel base;
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/* the datasheet refers to them as DSI-LINK1 and DSI-LINK2 */
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struct mipi_dsi_device *link1;
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struct mipi_dsi_device *link2;
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struct backlight_device *backlight;
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struct regulator *supply;
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bool prepared;
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bool enabled;
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const struct drm_display_mode *mode;
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};
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static inline struct sharp_panel *to_sharp_panel(struct drm_panel *panel)
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{
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return container_of(panel, struct sharp_panel, base);
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}
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static void sharp_wait_frames(struct sharp_panel *sharp, unsigned int frames)
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{
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unsigned int refresh = drm_mode_vrefresh(sharp->mode);
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if (WARN_ON(frames > refresh))
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return;
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msleep(1000 / (refresh / frames));
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}
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static int sharp_panel_write(struct sharp_panel *sharp, u16 offset, u8 value)
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{
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u8 payload[3] = { offset >> 8, offset & 0xff, value };
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struct mipi_dsi_device *dsi = sharp->link1;
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ssize_t err;
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err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
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if (err < 0) {
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dev_err(&dsi->dev, "failed to write %02x to %04x: %zd\n",
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value, offset, err);
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return err;
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}
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err = mipi_dsi_dcs_nop(dsi);
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if (err < 0) {
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dev_err(&dsi->dev, "failed to send DCS nop: %zd\n", err);
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return err;
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}
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usleep_range(10, 20);
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return 0;
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}
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static __maybe_unused int sharp_panel_read(struct sharp_panel *sharp,
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u16 offset, u8 *value)
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{
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ssize_t err;
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cpu_to_be16s(&offset);
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err = mipi_dsi_generic_read(sharp->link1, &offset, sizeof(offset),
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value, sizeof(*value));
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if (err < 0)
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dev_err(&sharp->link1->dev, "failed to read from %04x: %zd\n",
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offset, err);
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return err;
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}
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static int sharp_panel_disable(struct drm_panel *panel)
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{
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struct sharp_panel *sharp = to_sharp_panel(panel);
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if (!sharp->enabled)
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return 0;
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backlight_disable(sharp->backlight);
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sharp->enabled = false;
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return 0;
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}
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static int sharp_panel_unprepare(struct drm_panel *panel)
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{
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struct sharp_panel *sharp = to_sharp_panel(panel);
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int err;
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if (!sharp->prepared)
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return 0;
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sharp_wait_frames(sharp, 4);
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err = mipi_dsi_dcs_set_display_off(sharp->link1);
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if (err < 0)
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dev_err(panel->dev, "failed to set display off: %d\n", err);
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err = mipi_dsi_dcs_enter_sleep_mode(sharp->link1);
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if (err < 0)
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dev_err(panel->dev, "failed to enter sleep mode: %d\n", err);
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msleep(120);
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regulator_disable(sharp->supply);
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sharp->prepared = false;
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return 0;
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}
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static int sharp_setup_symmetrical_split(struct mipi_dsi_device *left,
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struct mipi_dsi_device *right,
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const struct drm_display_mode *mode)
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{
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int err;
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err = mipi_dsi_dcs_set_column_address(left, 0, mode->hdisplay / 2 - 1);
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if (err < 0) {
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dev_err(&left->dev, "failed to set column address: %d\n", err);
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return err;
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}
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err = mipi_dsi_dcs_set_page_address(left, 0, mode->vdisplay - 1);
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if (err < 0) {
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dev_err(&left->dev, "failed to set page address: %d\n", err);
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return err;
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}
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err = mipi_dsi_dcs_set_column_address(right, mode->hdisplay / 2,
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mode->hdisplay - 1);
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if (err < 0) {
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dev_err(&right->dev, "failed to set column address: %d\n", err);
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return err;
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}
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err = mipi_dsi_dcs_set_page_address(right, 0, mode->vdisplay - 1);
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if (err < 0) {
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dev_err(&right->dev, "failed to set page address: %d\n", err);
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return err;
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}
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return 0;
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}
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static int sharp_panel_prepare(struct drm_panel *panel)
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{
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struct sharp_panel *sharp = to_sharp_panel(panel);
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u8 format = MIPI_DCS_PIXEL_FMT_24BIT;
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int err;
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if (sharp->prepared)
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return 0;
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err = regulator_enable(sharp->supply);
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if (err < 0)
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return err;
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/*
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* According to the datasheet, the panel needs around 10 ms to fully
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* power up. At least another 120 ms is required before exiting sleep
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* mode to make sure the panel is ready. Throw in another 20 ms for
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* good measure.
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*/
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msleep(150);
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err = mipi_dsi_dcs_exit_sleep_mode(sharp->link1);
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if (err < 0) {
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dev_err(panel->dev, "failed to exit sleep mode: %d\n", err);
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goto poweroff;
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}
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/*
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* The MIPI DCS specification mandates this delay only between the
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* exit_sleep_mode and enter_sleep_mode commands, so it isn't strictly
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* necessary here.
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*/
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/*
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msleep(120);
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*/
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/* set left-right mode */
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err = sharp_panel_write(sharp, 0x1000, 0x2a);
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if (err < 0) {
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dev_err(panel->dev, "failed to set left-right mode: %d\n", err);
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goto poweroff;
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}
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/* enable command mode */
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err = sharp_panel_write(sharp, 0x1001, 0x01);
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if (err < 0) {
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dev_err(panel->dev, "failed to enable command mode: %d\n", err);
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goto poweroff;
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}
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err = mipi_dsi_dcs_set_pixel_format(sharp->link1, format);
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if (err < 0) {
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dev_err(panel->dev, "failed to set pixel format: %d\n", err);
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goto poweroff;
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}
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/*
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* TODO: The device supports both left-right and even-odd split
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* configurations, but this driver currently supports only the left-
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* right split. To support a different mode a mechanism needs to be
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* put in place to communicate the configuration back to the DSI host
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* controller.
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*/
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err = sharp_setup_symmetrical_split(sharp->link1, sharp->link2,
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sharp->mode);
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if (err < 0) {
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dev_err(panel->dev, "failed to set up symmetrical split: %d\n",
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err);
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goto poweroff;
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}
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err = mipi_dsi_dcs_set_display_on(sharp->link1);
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if (err < 0) {
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dev_err(panel->dev, "failed to set display on: %d\n", err);
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goto poweroff;
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}
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sharp->prepared = true;
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/* wait for 6 frames before continuing */
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sharp_wait_frames(sharp, 6);
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return 0;
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poweroff:
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regulator_disable(sharp->supply);
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return err;
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}
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static int sharp_panel_enable(struct drm_panel *panel)
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{
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struct sharp_panel *sharp = to_sharp_panel(panel);
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if (sharp->enabled)
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return 0;
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backlight_enable(sharp->backlight);
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sharp->enabled = true;
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return 0;
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}
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static const struct drm_display_mode default_mode = {
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.clock = 278000,
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.hdisplay = 2560,
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.hsync_start = 2560 + 128,
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.hsync_end = 2560 + 128 + 64,
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.htotal = 2560 + 128 + 64 + 64,
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.vdisplay = 1600,
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.vsync_start = 1600 + 4,
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.vsync_end = 1600 + 4 + 8,
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.vtotal = 1600 + 4 + 8 + 32,
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.vrefresh = 60,
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};
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static int sharp_panel_get_modes(struct drm_panel *panel)
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{
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struct drm_display_mode *mode;
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mode = drm_mode_duplicate(panel->drm, &default_mode);
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if (!mode) {
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dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
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default_mode.hdisplay, default_mode.vdisplay,
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default_mode.vrefresh);
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return -ENOMEM;
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}
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drm_mode_set_name(mode);
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drm_mode_probed_add(panel->connector, mode);
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panel->connector->display_info.width_mm = 217;
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panel->connector->display_info.height_mm = 136;
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return 1;
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}
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static const struct drm_panel_funcs sharp_panel_funcs = {
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.disable = sharp_panel_disable,
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.unprepare = sharp_panel_unprepare,
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.prepare = sharp_panel_prepare,
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.enable = sharp_panel_enable,
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.get_modes = sharp_panel_get_modes,
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};
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static const struct of_device_id sharp_of_match[] = {
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{ .compatible = "sharp,lq101r1sx01", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, sharp_of_match);
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static int sharp_panel_add(struct sharp_panel *sharp)
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{
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struct device *dev = &sharp->link1->dev;
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sharp->mode = &default_mode;
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sharp->supply = devm_regulator_get(&sharp->link1->dev, "power");
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if (IS_ERR(sharp->supply))
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return PTR_ERR(sharp->supply);
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sharp->backlight = devm_of_find_backlight(dev);
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if (IS_ERR(sharp->backlight))
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return PTR_ERR(sharp->backlight);
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drm_panel_init(&sharp->base);
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sharp->base.funcs = &sharp_panel_funcs;
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sharp->base.dev = &sharp->link1->dev;
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return drm_panel_add(&sharp->base);
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}
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static void sharp_panel_del(struct sharp_panel *sharp)
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{
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if (sharp->base.dev)
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drm_panel_remove(&sharp->base);
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if (sharp->link2)
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put_device(&sharp->link2->dev);
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}
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static int sharp_panel_probe(struct mipi_dsi_device *dsi)
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{
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struct mipi_dsi_device *secondary = NULL;
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struct sharp_panel *sharp;
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struct device_node *np;
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int err;
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dsi->lanes = 4;
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dsi->format = MIPI_DSI_FMT_RGB888;
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dsi->mode_flags = MIPI_DSI_MODE_LPM;
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/* Find DSI-LINK1 */
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np = of_parse_phandle(dsi->dev.of_node, "link2", 0);
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if (np) {
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secondary = of_find_mipi_dsi_device_by_node(np);
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of_node_put(np);
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if (!secondary)
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return -EPROBE_DEFER;
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}
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/* register a panel for only the DSI-LINK1 interface */
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if (secondary) {
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sharp = devm_kzalloc(&dsi->dev, sizeof(*sharp), GFP_KERNEL);
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if (!sharp) {
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put_device(&secondary->dev);
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return -ENOMEM;
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}
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mipi_dsi_set_drvdata(dsi, sharp);
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sharp->link2 = secondary;
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sharp->link1 = dsi;
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err = sharp_panel_add(sharp);
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if (err < 0) {
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put_device(&secondary->dev);
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return err;
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}
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}
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err = mipi_dsi_attach(dsi);
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if (err < 0) {
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if (secondary)
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sharp_panel_del(sharp);
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return err;
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}
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return 0;
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}
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static int sharp_panel_remove(struct mipi_dsi_device *dsi)
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{
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struct sharp_panel *sharp = mipi_dsi_get_drvdata(dsi);
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int err;
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/* only detach from host for the DSI-LINK2 interface */
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if (!sharp) {
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mipi_dsi_detach(dsi);
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return 0;
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}
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err = sharp_panel_disable(&sharp->base);
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if (err < 0)
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dev_err(&dsi->dev, "failed to disable panel: %d\n", err);
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err = mipi_dsi_detach(dsi);
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if (err < 0)
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dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", err);
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sharp_panel_del(sharp);
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return 0;
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}
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static void sharp_panel_shutdown(struct mipi_dsi_device *dsi)
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{
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struct sharp_panel *sharp = mipi_dsi_get_drvdata(dsi);
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/* nothing to do for DSI-LINK2 */
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if (!sharp)
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return;
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sharp_panel_disable(&sharp->base);
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}
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static struct mipi_dsi_driver sharp_panel_driver = {
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.driver = {
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.name = "panel-sharp-lq101r1sx01",
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.of_match_table = sharp_of_match,
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},
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.probe = sharp_panel_probe,
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.remove = sharp_panel_remove,
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.shutdown = sharp_panel_shutdown,
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};
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module_mipi_dsi_driver(sharp_panel_driver);
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MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
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MODULE_DESCRIPTION("Sharp LQ101R1SX01 panel driver");
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MODULE_LICENSE("GPL v2");
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