text: /*
   * Copyright (C) 2013 Red Hat
   * Author: Rob Clark <robdclark@gmail.com>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include "mdp4_kms.h"
  
  #include "drm_crtc.h"
  #include "drm_crtc_helper.h"
  
  
  struct mdp4_dtv_encoder {
  	struct drm_encoder base;
  	struct clk *src_clk;
  	struct clk *hdmi_clk;
  	struct clk *mdp_clk;
  	unsigned long int pixclock;
  	bool enabled;
  	uint32_t bsc;
  };
  #define to_mdp4_dtv_encoder(x) container_of(x, struct mdp4_dtv_encoder, base)
  
  static struct mdp4_kms *get_kms(struct drm_encoder *encoder)
  {
  	struct msm_drm_private *priv = encoder->dev->dev_private;
  	return to_mdp4_kms(to_mdp_kms(priv->kms));
  }
  
  #ifdef DOWNSTREAM_CONFIG_MSM_BUS_SCALING
  #include <mach/board.h>
  /* not ironically named at all.. no, really.. */
  static void bs_init(struct mdp4_dtv_encoder *mdp4_dtv_encoder)
  {
  	struct drm_device *dev = mdp4_dtv_encoder->base.dev;
  	struct lcdc_platform_data *dtv_pdata = mdp4_find_pdata("dtv.0");
  
  	if (!dtv_pdata) {
  		dev_err(dev->dev, "could not find dtv pdata\n");
  		return;
  	}
  
  	if (dtv_pdata->bus_scale_table) {
  		mdp4_dtv_encoder->bsc = msm_bus_scale_register_client(
  				dtv_pdata->bus_scale_table);
  		DBG("bus scale client: %08x", mdp4_dtv_encoder->bsc);
  		DBG("lcdc_power_save: %p", dtv_pdata->lcdc_power_save);
  		if (dtv_pdata->lcdc_power_save)
  			dtv_pdata->lcdc_power_save(1);
  	}
  }
  
  static void bs_fini(struct mdp4_dtv_encoder *mdp4_dtv_encoder)
  {
  	if (mdp4_dtv_encoder->bsc) {
  		msm_bus_scale_unregister_client(mdp4_dtv_encoder->bsc);
  		mdp4_dtv_encoder->bsc = 0;
  	}
  }
  
  static void bs_set(struct mdp4_dtv_encoder *mdp4_dtv_encoder, int idx)
  {
  	if (mdp4_dtv_encoder->bsc) {
  		DBG("set bus scaling: %d", idx);
  		msm_bus_scale_client_update_request(mdp4_dtv_encoder->bsc, idx);
  	}
  }
  #else
  static void bs_init(struct mdp4_dtv_encoder *mdp4_dtv_encoder) {}
  static void bs_fini(struct mdp4_dtv_encoder *mdp4_dtv_encoder) {}
  static void bs_set(struct mdp4_dtv_encoder *mdp4_dtv_encoder, int idx) {}
  #endif
  
  static void mdp4_dtv_encoder_destroy(struct drm_encoder *encoder)
  {
  	struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
  	bs_fini(mdp4_dtv_encoder);
  	drm_encoder_cleanup(encoder);
  	kfree(mdp4_dtv_encoder);
  }
  
  static const struct drm_encoder_funcs mdp4_dtv_encoder_funcs = {
  	.destroy = mdp4_dtv_encoder_destroy,
  };
  
  static void mdp4_dtv_encoder_mode_set(struct drm_encoder *encoder,
  		struct drm_display_mode *mode,
  		struct drm_display_mode *adjusted_mode)
  {
  	struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
  	struct mdp4_kms *mdp4_kms = get_kms(encoder);
  	uint32_t dtv_hsync_skew, vsync_period, vsync_len, ctrl_pol;
  	uint32_t display_v_start, display_v_end;
  	uint32_t hsync_start_x, hsync_end_x;
  
  	mode = adjusted_mode;
  
  	DBG("set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
  			mode->base.id, mode->name,
  			mode->vrefresh, mode->clock,
  			mode->hdisplay, mode->hsync_start,
  			mode->hsync_end, mode->htotal,
  			mode->vdisplay, mode->vsync_start,
  			mode->vsync_end, mode->vtotal,
  			mode->type, mode->flags);
  
  	mdp4_dtv_encoder->pixclock = mode->clock * 1000;
  
  	DBG("pixclock=%lu", mdp4_dtv_encoder->pixclock);
  
  	ctrl_pol = 0;
  	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
  		ctrl_pol |= MDP4_DTV_CTRL_POLARITY_HSYNC_LOW;
  	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
  		ctrl_pol |= MDP4_DTV_CTRL_POLARITY_VSYNC_LOW;
  	/* probably need to get DATA_EN polarity from panel.. */
  
  	dtv_hsync_skew = 0;  /* get this from panel? */
  
  	hsync_start_x = (mode->htotal - mode->hsync_start);
  	hsync_end_x = mode->htotal - (mode->hsync_start - mode->hdisplay) - 1;
  
  	vsync_period = mode->vtotal * mode->htotal;
  	vsync_len = (mode->vsync_end - mode->vsync_start) * mode->htotal;
  	display_v_start = (mode->vtotal - mode->vsync_start) * mode->htotal + dtv_hsync_skew;
  	display_v_end = vsync_period - ((mode->vsync_start - mode->vdisplay) * mode->htotal) + dtv_hsync_skew - 1;
  
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_HSYNC_CTRL,
  			MDP4_DTV_HSYNC_CTRL_PULSEW(mode->hsync_end - mode->hsync_start) |
  			MDP4_DTV_HSYNC_CTRL_PERIOD(mode->htotal));
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_VSYNC_PERIOD, vsync_period);
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_VSYNC_LEN, vsync_len);
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_DISPLAY_HCTRL,
  			MDP4_DTV_DISPLAY_HCTRL_START(hsync_start_x) |
  			MDP4_DTV_DISPLAY_HCTRL_END(hsync_end_x));
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_DISPLAY_VSTART, display_v_start);
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_DISPLAY_VEND, display_v_end);
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_BORDER_CLR, 0);
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_UNDERFLOW_CLR,
  			MDP4_DTV_UNDERFLOW_CLR_ENABLE_RECOVERY |
  			MDP4_DTV_UNDERFLOW_CLR_COLOR(0xff));
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_HSYNC_SKEW, dtv_hsync_skew);
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_CTRL_POLARITY, ctrl_pol);
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_ACTIVE_HCTL,
  			MDP4_DTV_ACTIVE_HCTL_START(0) |
  			MDP4_DTV_ACTIVE_HCTL_END(0));
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_ACTIVE_VSTART, 0);
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_ACTIVE_VEND, 0);
  }
  
  static void mdp4_dtv_encoder_disable(struct drm_encoder *encoder)
  {
  	struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
  	struct mdp4_kms *mdp4_kms = get_kms(encoder);
  
  	if (WARN_ON(!mdp4_dtv_encoder->enabled))
  		return;
  
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_ENABLE, 0);
  
  	/*
  	 * Wait for a vsync so we know the ENABLE=0 latched before
  	 * the (connector) source of the vsync's gets disabled,
  	 * otherwise we end up in a funny state if we re-enable
  	 * before the disable latches, which results that some of
  	 * the settings changes for the new modeset (like new
  	 * scanout buffer) don't latch properly..
  	 */
  	mdp_irq_wait(&mdp4_kms->base, MDP4_IRQ_EXTERNAL_VSYNC);
  
  	clk_disable_unprepare(mdp4_dtv_encoder->src_clk);
  	clk_disable_unprepare(mdp4_dtv_encoder->hdmi_clk);
  	clk_disable_unprepare(mdp4_dtv_encoder->mdp_clk);
  
  	bs_set(mdp4_dtv_encoder, 0);
  
  	mdp4_dtv_encoder->enabled = false;
  }
  
  static void mdp4_dtv_encoder_enable(struct drm_encoder *encoder)
  {
  	struct drm_device *dev = encoder->dev;
  	struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
  	struct mdp4_kms *mdp4_kms = get_kms(encoder);
  	unsigned long pc = mdp4_dtv_encoder->pixclock;
  	int ret;
  
  	if (WARN_ON(mdp4_dtv_encoder->enabled))
  		return;
  
  	mdp4_crtc_set_config(encoder->crtc,
  			MDP4_DMA_CONFIG_R_BPC(BPC8) |
  			MDP4_DMA_CONFIG_G_BPC(BPC8) |
  			MDP4_DMA_CONFIG_B_BPC(BPC8) |
  			MDP4_DMA_CONFIG_PACK(0x21));
  	mdp4_crtc_set_intf(encoder->crtc, INTF_LCDC_DTV, 1);
  
  	bs_set(mdp4_dtv_encoder, 1);
  
  	DBG("setting src_clk=%lu", pc);
  
  	ret = clk_set_rate(mdp4_dtv_encoder->src_clk, pc);
  	if (ret)
  		dev_err(dev->dev, "failed to set src_clk to %lu: %d\n", pc, ret);
  	clk_prepare_enable(mdp4_dtv_encoder->src_clk);
  	ret = clk_prepare_enable(mdp4_dtv_encoder->hdmi_clk);
  	if (ret)
  		dev_err(dev->dev, "failed to enable hdmi_clk: %d\n", ret);
  	ret = clk_prepare_enable(mdp4_dtv_encoder->mdp_clk);
  	if (ret)
  		dev_err(dev->dev, "failed to enabled mdp_clk: %d\n", ret);
  
  	mdp4_write(mdp4_kms, REG_MDP4_DTV_ENABLE, 1);
  
  	mdp4_dtv_encoder->enabled = true;
  }
  
  static const struct drm_encoder_helper_funcs mdp4_dtv_encoder_helper_funcs = {
  	.mode_set = mdp4_dtv_encoder_mode_set,
  	.enable = mdp4_dtv_encoder_enable,
  	.disable = mdp4_dtv_encoder_disable,
  };
  
  long mdp4_dtv_round_pixclk(struct drm_encoder *encoder, unsigned long rate)
  {
  	struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
  	return clk_round_rate(mdp4_dtv_encoder->src_clk, rate);
  }
  
  /* initialize encoder */
  struct drm_encoder *mdp4_dtv_encoder_init(struct drm_device *dev)
  {
  	struct drm_encoder *encoder = NULL;
  	struct mdp4_dtv_encoder *mdp4_dtv_encoder;
  	int ret;
  
  	mdp4_dtv_encoder = kzalloc(sizeof(*mdp4_dtv_encoder), GFP_KERNEL);
  	if (!mdp4_dtv_encoder) {
  		ret = -ENOMEM;
  		goto fail;
  	}
  
  	encoder = &mdp4_dtv_encoder->base;
  
  	drm_encoder_init(dev, encoder, &mdp4_dtv_encoder_funcs,
  			 DRM_MODE_ENCODER_TMDS, NULL);
  	drm_encoder_helper_add(encoder, &mdp4_dtv_encoder_helper_funcs);
  
  	mdp4_dtv_encoder->src_clk = devm_clk_get(dev->dev, "src_clk");
  	if (IS_ERR(mdp4_dtv_encoder->src_clk)) {
  		dev_err(dev->dev, "failed to get src_clk\n");
  		ret = PTR_ERR(mdp4_dtv_encoder->src_clk);
  		goto fail;
  	}
  
  	mdp4_dtv_encoder->hdmi_clk = devm_clk_get(dev->dev, "hdmi_clk");
  	if (IS_ERR(mdp4_dtv_encoder->hdmi_clk)) {
  		dev_err(dev->dev, "failed to get hdmi_clk\n");
  		ret = PTR_ERR(mdp4_dtv_encoder->hdmi_clk);
  		goto fail;
  	}
  
  	mdp4_dtv_encoder->mdp_clk = devm_clk_get(dev->dev, "mdp_clk");
  	if (IS_ERR(mdp4_dtv_encoder->mdp_clk)) {
  		dev_err(dev->dev, "failed to get mdp_clk\n");
  		ret = PTR_ERR(mdp4_dtv_encoder->mdp_clk);
  		goto fail;
  	}
  
  	bs_init(mdp4_dtv_encoder);
  
  	return encoder;
  
  fail:
  	if (encoder)
  		mdp4_dtv_encoder_destroy(encoder);
  
  	return ERR_PTR(ret);
  }
  