280 lines
7.0 KiB
C
280 lines
7.0 KiB
C
/*
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* Copyright (C) 2015 Free Electrons
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* Copyright (C) 2015 NextThing Co
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <linux/clk.h>
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#include <drm/drmP.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_panel.h>
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#include "sun4i_drv.h"
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#include "sun4i_tcon.h"
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#include "sun4i_rgb.h"
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struct sun4i_rgb {
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struct drm_connector connector;
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struct drm_encoder encoder;
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struct sun4i_drv *drv;
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};
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static inline struct sun4i_rgb *
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drm_connector_to_sun4i_rgb(struct drm_connector *connector)
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{
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return container_of(connector, struct sun4i_rgb,
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connector);
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}
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static inline struct sun4i_rgb *
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drm_encoder_to_sun4i_rgb(struct drm_encoder *encoder)
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{
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return container_of(encoder, struct sun4i_rgb,
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encoder);
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}
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static int sun4i_rgb_get_modes(struct drm_connector *connector)
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{
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struct sun4i_rgb *rgb =
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drm_connector_to_sun4i_rgb(connector);
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struct sun4i_drv *drv = rgb->drv;
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struct sun4i_tcon *tcon = drv->tcon;
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return drm_panel_get_modes(tcon->panel);
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}
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static int sun4i_rgb_mode_valid(struct drm_connector *connector,
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struct drm_display_mode *mode)
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{
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struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
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struct sun4i_drv *drv = rgb->drv;
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struct sun4i_tcon *tcon = drv->tcon;
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u32 hsync = mode->hsync_end - mode->hsync_start;
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u32 vsync = mode->vsync_end - mode->vsync_start;
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unsigned long rate = mode->clock * 1000;
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long rounded_rate;
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DRM_DEBUG_DRIVER("Validating modes...\n");
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if (hsync < 1)
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return MODE_HSYNC_NARROW;
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if (hsync > 0x3ff)
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return MODE_HSYNC_WIDE;
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if ((mode->hdisplay < 1) || (mode->htotal < 1))
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return MODE_H_ILLEGAL;
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if ((mode->hdisplay > 0x7ff) || (mode->htotal > 0xfff))
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return MODE_BAD_HVALUE;
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DRM_DEBUG_DRIVER("Horizontal parameters OK\n");
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if (vsync < 1)
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return MODE_VSYNC_NARROW;
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if (vsync > 0x3ff)
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return MODE_VSYNC_WIDE;
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if ((mode->vdisplay < 1) || (mode->vtotal < 1))
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return MODE_V_ILLEGAL;
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if ((mode->vdisplay > 0x7ff) || (mode->vtotal > 0xfff))
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return MODE_BAD_VVALUE;
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DRM_DEBUG_DRIVER("Vertical parameters OK\n");
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rounded_rate = clk_round_rate(tcon->dclk, rate);
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if (rounded_rate < rate)
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return MODE_CLOCK_LOW;
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if (rounded_rate > rate)
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return MODE_CLOCK_HIGH;
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DRM_DEBUG_DRIVER("Clock rate OK\n");
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return MODE_OK;
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}
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static struct drm_connector_helper_funcs sun4i_rgb_con_helper_funcs = {
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.get_modes = sun4i_rgb_get_modes,
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.mode_valid = sun4i_rgb_mode_valid,
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};
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static void
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sun4i_rgb_connector_destroy(struct drm_connector *connector)
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{
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struct sun4i_rgb *rgb = drm_connector_to_sun4i_rgb(connector);
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struct sun4i_drv *drv = rgb->drv;
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struct sun4i_tcon *tcon = drv->tcon;
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drm_panel_detach(tcon->panel);
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drm_connector_cleanup(connector);
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}
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static struct drm_connector_funcs sun4i_rgb_con_funcs = {
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.dpms = drm_atomic_helper_connector_dpms,
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.fill_modes = drm_helper_probe_single_connector_modes,
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.destroy = sun4i_rgb_connector_destroy,
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.reset = drm_atomic_helper_connector_reset,
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.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
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};
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static int sun4i_rgb_atomic_check(struct drm_encoder *encoder,
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struct drm_crtc_state *crtc_state,
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struct drm_connector_state *conn_state)
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{
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return 0;
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}
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static void sun4i_rgb_encoder_enable(struct drm_encoder *encoder)
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{
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struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
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struct sun4i_drv *drv = rgb->drv;
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struct sun4i_tcon *tcon = drv->tcon;
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DRM_DEBUG_DRIVER("Enabling RGB output\n");
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if (!IS_ERR(tcon->panel))
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drm_panel_prepare(tcon->panel);
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sun4i_tcon_channel_enable(tcon, 0);
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if (!IS_ERR(tcon->panel))
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drm_panel_enable(tcon->panel);
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}
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static void sun4i_rgb_encoder_disable(struct drm_encoder *encoder)
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{
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struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
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struct sun4i_drv *drv = rgb->drv;
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struct sun4i_tcon *tcon = drv->tcon;
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DRM_DEBUG_DRIVER("Disabling RGB output\n");
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if (!IS_ERR(tcon->panel))
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drm_panel_disable(tcon->panel);
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sun4i_tcon_channel_disable(tcon, 0);
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if (!IS_ERR(tcon->panel))
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drm_panel_unprepare(tcon->panel);
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}
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static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
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struct drm_display_mode *mode,
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struct drm_display_mode *adjusted_mode)
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{
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struct sun4i_rgb *rgb = drm_encoder_to_sun4i_rgb(encoder);
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struct sun4i_drv *drv = rgb->drv;
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struct sun4i_tcon *tcon = drv->tcon;
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sun4i_tcon0_mode_set(tcon, mode);
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clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
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/* FIXME: This seems to be board specific */
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clk_set_phase(tcon->dclk, 120);
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}
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static struct drm_encoder_helper_funcs sun4i_rgb_enc_helper_funcs = {
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.atomic_check = sun4i_rgb_atomic_check,
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.mode_set = sun4i_rgb_encoder_mode_set,
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.disable = sun4i_rgb_encoder_disable,
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.enable = sun4i_rgb_encoder_enable,
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};
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static void sun4i_rgb_enc_destroy(struct drm_encoder *encoder)
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{
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drm_encoder_cleanup(encoder);
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}
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static struct drm_encoder_funcs sun4i_rgb_enc_funcs = {
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.destroy = sun4i_rgb_enc_destroy,
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};
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int sun4i_rgb_init(struct drm_device *drm)
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{
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struct sun4i_drv *drv = drm->dev_private;
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struct sun4i_tcon *tcon = drv->tcon;
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struct drm_encoder *encoder;
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struct drm_bridge *bridge;
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struct sun4i_rgb *rgb;
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int ret;
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rgb = devm_kzalloc(drm->dev, sizeof(*rgb), GFP_KERNEL);
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if (!rgb)
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return -ENOMEM;
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rgb->drv = drv;
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encoder = &rgb->encoder;
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tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
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bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
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if (IS_ERR(tcon->panel) && IS_ERR(bridge)) {
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dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
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return 0;
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}
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drm_encoder_helper_add(&rgb->encoder,
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&sun4i_rgb_enc_helper_funcs);
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ret = drm_encoder_init(drm,
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&rgb->encoder,
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&sun4i_rgb_enc_funcs,
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DRM_MODE_ENCODER_NONE,
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NULL);
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if (ret) {
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dev_err(drm->dev, "Couldn't initialise the rgb encoder\n");
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goto err_out;
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}
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/* The RGB encoder can only work with the TCON channel 0 */
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rgb->encoder.possible_crtcs = BIT(0);
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if (!IS_ERR(tcon->panel)) {
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drm_connector_helper_add(&rgb->connector,
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&sun4i_rgb_con_helper_funcs);
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ret = drm_connector_init(drm, &rgb->connector,
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&sun4i_rgb_con_funcs,
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DRM_MODE_CONNECTOR_Unknown);
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if (ret) {
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dev_err(drm->dev, "Couldn't initialise the rgb connector\n");
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goto err_cleanup_connector;
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}
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drm_mode_connector_attach_encoder(&rgb->connector,
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&rgb->encoder);
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ret = drm_panel_attach(tcon->panel, &rgb->connector);
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if (ret) {
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dev_err(drm->dev, "Couldn't attach our panel\n");
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goto err_cleanup_connector;
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}
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}
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if (!IS_ERR(bridge)) {
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ret = drm_bridge_attach(encoder, bridge, NULL);
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if (ret) {
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dev_err(drm->dev, "Couldn't attach our bridge\n");
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goto err_cleanup_connector;
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}
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}
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return 0;
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err_cleanup_connector:
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drm_encoder_cleanup(&rgb->encoder);
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err_out:
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return ret;
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}
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EXPORT_SYMBOL(sun4i_rgb_init);
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