drivers/gpu/drm/msm/disp/mdp4/mdp4_dtv_encoder.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <robdclark@gmail.com>
   5  */
   6
   7 #include <drm/drm_crtc.h>
   8 #include <drm/drm_probe_helper.h>
   9
  10 #include "mdp4_kms.h"
  11
  12 struct mdp4_dtv_encoder {
  13         struct drm_encoder base;
  14         struct clk *hdmi_clk;
  15         struct clk *mdp_clk;
  16         unsigned long int pixclock;
  17         bool enabled;
  18         uint32_t bsc;
  19 };
  20 #define to_mdp4_dtv_encoder(x) container_of(x, struct mdp4_dtv_encoder, base)
  21
  22 static struct mdp4_kms *get_kms(struct drm_encoder *encoder)
  23 {
  24         struct msm_drm_private *priv = encoder->dev->dev_private;
  25         return to_mdp4_kms(to_mdp_kms(priv->kms));
  26 }
  27
  28 #ifdef DOWNSTREAM_CONFIG_MSM_BUS_SCALING
  29 #include <mach/board.h>
  30 /* not ironically named at all.. no, really.. */
  31 static void bs_init(struct mdp4_dtv_encoder *mdp4_dtv_encoder)
  32 {
  33         struct drm_device *dev = mdp4_dtv_encoder->base.dev;
  34         struct lcdc_platform_data *dtv_pdata = mdp4_find_pdata("dtv.0");
  35
  36         if (!dtv_pdata) {
  37                 DRM_DEV_ERROR(dev->dev, "could not find dtv pdata\n");
  38                 return;
  39         }
  40
  41         if (dtv_pdata->bus_scale_table) {
  42                 mdp4_dtv_encoder->bsc = msm_bus_scale_register_client(
  43                                 dtv_pdata->bus_scale_table);
  44                 DBG("bus scale client: %08x", mdp4_dtv_encoder->bsc);
  45                 DBG("lcdc_power_save: %p", dtv_pdata->lcdc_power_save);
  46                 if (dtv_pdata->lcdc_power_save)
  47                         dtv_pdata->lcdc_power_save(1);
  48         }
  49 }
  50
  51 static void bs_fini(struct mdp4_dtv_encoder *mdp4_dtv_encoder)
  52 {
  53         if (mdp4_dtv_encoder->bsc) {
  54                 msm_bus_scale_unregister_client(mdp4_dtv_encoder->bsc);
  55                 mdp4_dtv_encoder->bsc = 0;
  56         }
  57 }
  58
  59 static void bs_set(struct mdp4_dtv_encoder *mdp4_dtv_encoder, int idx)
  60 {
  61         if (mdp4_dtv_encoder->bsc) {
  62                 DBG("set bus scaling: %d", idx);
  63                 msm_bus_scale_client_update_request(mdp4_dtv_encoder->bsc, idx);
  64         }
  65 }
  66 #else
  67 static void bs_init(struct mdp4_dtv_encoder *mdp4_dtv_encoder) {}
  68 static void bs_fini(struct mdp4_dtv_encoder *mdp4_dtv_encoder) {}
  69 static void bs_set(struct mdp4_dtv_encoder *mdp4_dtv_encoder, int idx) {}
  70 #endif
  71
  72 static void mdp4_dtv_encoder_destroy(struct drm_encoder *encoder)
  73 {
  74         struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
  75         bs_fini(mdp4_dtv_encoder);
  76         drm_encoder_cleanup(encoder);
  77         kfree(mdp4_dtv_encoder);
  78 }
  79
  80 static const struct drm_encoder_funcs mdp4_dtv_encoder_funcs = {
  81         .destroy = mdp4_dtv_encoder_destroy,
  82 };
  83
  84 static void mdp4_dtv_encoder_mode_set(struct drm_encoder *encoder,
  85                 struct drm_display_mode *mode,
  86                 struct drm_display_mode *adjusted_mode)
  87 {
  88         struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
  89         struct mdp4_kms *mdp4_kms = get_kms(encoder);
  90         uint32_t dtv_hsync_skew, vsync_period, vsync_len, ctrl_pol;
  91         uint32_t display_v_start, display_v_end;
  92         uint32_t hsync_start_x, hsync_end_x;
  93
  94         mode = adjusted_mode;
  95
  96         DBG("set mode: " DRM_MODE_FMT, DRM_MODE_ARG(mode));
  97
  98         mdp4_dtv_encoder->pixclock = mode->clock * 1000;
  99
 100         DBG("pixclock=%lu", mdp4_dtv_encoder->pixclock);
 101
 102         ctrl_pol = 0;
 103         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 104                 ctrl_pol |= MDP4_DTV_CTRL_POLARITY_HSYNC_LOW;
 105         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 106                 ctrl_pol |= MDP4_DTV_CTRL_POLARITY_VSYNC_LOW;
 107         /* probably need to get DATA_EN polarity from panel.. */
 108
 109         dtv_hsync_skew = 0;  /* get this from panel? */
 110
 111         hsync_start_x = (mode->htotal - mode->hsync_start);
 112         hsync_end_x = mode->htotal - (mode->hsync_start - mode->hdisplay) - 1;
 113
 114         vsync_period = mode->vtotal * mode->htotal;
 115         vsync_len = (mode->vsync_end - mode->vsync_start) * mode->htotal;
 116         display_v_start = (mode->vtotal - mode->vsync_start) * mode->htotal + dtv_hsync_skew;
 117         display_v_end = vsync_period - ((mode->vsync_start - mode->vdisplay) * mode->htotal) + dtv_hsync_skew - 1;
 118
 119         mdp4_write(mdp4_kms, REG_MDP4_DTV_HSYNC_CTRL,
 120                         MDP4_DTV_HSYNC_CTRL_PULSEW(mode->hsync_end - mode->hsync_start) |
 121                         MDP4_DTV_HSYNC_CTRL_PERIOD(mode->htotal));
 122         mdp4_write(mdp4_kms, REG_MDP4_DTV_VSYNC_PERIOD, vsync_period);
 123         mdp4_write(mdp4_kms, REG_MDP4_DTV_VSYNC_LEN, vsync_len);
 124         mdp4_write(mdp4_kms, REG_MDP4_DTV_DISPLAY_HCTRL,
 125                         MDP4_DTV_DISPLAY_HCTRL_START(hsync_start_x) |
 126                         MDP4_DTV_DISPLAY_HCTRL_END(hsync_end_x));
 127         mdp4_write(mdp4_kms, REG_MDP4_DTV_DISPLAY_VSTART, display_v_start);
 128         mdp4_write(mdp4_kms, REG_MDP4_DTV_DISPLAY_VEND, display_v_end);
 129         mdp4_write(mdp4_kms, REG_MDP4_DTV_BORDER_CLR, 0);
 130         mdp4_write(mdp4_kms, REG_MDP4_DTV_UNDERFLOW_CLR,
 131                         MDP4_DTV_UNDERFLOW_CLR_ENABLE_RECOVERY |
 132                         MDP4_DTV_UNDERFLOW_CLR_COLOR(0xff));
 133         mdp4_write(mdp4_kms, REG_MDP4_DTV_HSYNC_SKEW, dtv_hsync_skew);
 134         mdp4_write(mdp4_kms, REG_MDP4_DTV_CTRL_POLARITY, ctrl_pol);
 135         mdp4_write(mdp4_kms, REG_MDP4_DTV_ACTIVE_HCTL,
 136                         MDP4_DTV_ACTIVE_HCTL_START(0) |
 137                         MDP4_DTV_ACTIVE_HCTL_END(0));
 138         mdp4_write(mdp4_kms, REG_MDP4_DTV_ACTIVE_VSTART, 0);
 139         mdp4_write(mdp4_kms, REG_MDP4_DTV_ACTIVE_VEND, 0);
 140 }
 141
 142 static void mdp4_dtv_encoder_disable(struct drm_encoder *encoder)
 143 {
 144         struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
 145         struct mdp4_kms *mdp4_kms = get_kms(encoder);
 146
 147         if (WARN_ON(!mdp4_dtv_encoder->enabled))
 148                 return;
 149
 150         mdp4_write(mdp4_kms, REG_MDP4_DTV_ENABLE, 0);
 151
 152         /*
 153          * Wait for a vsync so we know the ENABLE=0 latched before
 154          * the (connector) source of the vsync's gets disabled,
 155          * otherwise we end up in a funny state if we re-enable
 156          * before the disable latches, which results that some of
 157          * the settings changes for the new modeset (like new
 158          * scanout buffer) don't latch properly..
 159          */
 160         mdp_irq_wait(&mdp4_kms->base, MDP4_IRQ_EXTERNAL_VSYNC);
 161
 162         clk_disable_unprepare(mdp4_dtv_encoder->hdmi_clk);
 163         clk_disable_unprepare(mdp4_dtv_encoder->mdp_clk);
 164
 165         bs_set(mdp4_dtv_encoder, 0);
 166
 167         mdp4_dtv_encoder->enabled = false;
 168 }
 169
 170 static void mdp4_dtv_encoder_enable(struct drm_encoder *encoder)
 171 {
 172         struct drm_device *dev = encoder->dev;
 173         struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
 174         struct mdp4_kms *mdp4_kms = get_kms(encoder);
 175         unsigned long pc = mdp4_dtv_encoder->pixclock;
 176         int ret;
 177
 178         if (WARN_ON(mdp4_dtv_encoder->enabled))
 179                 return;
 180
 181         mdp4_crtc_set_config(encoder->crtc,
 182                         MDP4_DMA_CONFIG_R_BPC(BPC8) |
 183                         MDP4_DMA_CONFIG_G_BPC(BPC8) |
 184                         MDP4_DMA_CONFIG_B_BPC(BPC8) |
 185                         MDP4_DMA_CONFIG_PACK(0x21));
 186         mdp4_crtc_set_intf(encoder->crtc, INTF_LCDC_DTV, 1);
 187
 188         bs_set(mdp4_dtv_encoder, 1);
 189
 190         DBG("setting mdp_clk=%lu", pc);
 191
 192         ret = clk_set_rate(mdp4_dtv_encoder->mdp_clk, pc);
 193         if (ret)
 194                 DRM_DEV_ERROR(dev->dev, "failed to set mdp_clk to %lu: %d\n",
 195                         pc, ret);
 196
 197         ret = clk_prepare_enable(mdp4_dtv_encoder->mdp_clk);
 198         if (ret)
 199                 DRM_DEV_ERROR(dev->dev, "failed to enabled mdp_clk: %d\n", ret);
 200
 201         ret = clk_prepare_enable(mdp4_dtv_encoder->hdmi_clk);
 202         if (ret)
 203                 DRM_DEV_ERROR(dev->dev, "failed to enable hdmi_clk: %d\n", ret);
 204
 205         mdp4_write(mdp4_kms, REG_MDP4_DTV_ENABLE, 1);
 206
 207         mdp4_dtv_encoder->enabled = true;
 208 }
 209
 210 static const struct drm_encoder_helper_funcs mdp4_dtv_encoder_helper_funcs = {
 211         .mode_set = mdp4_dtv_encoder_mode_set,
 212         .enable = mdp4_dtv_encoder_enable,
 213         .disable = mdp4_dtv_encoder_disable,
 214 };
 215
 216 long mdp4_dtv_round_pixclk(struct drm_encoder *encoder, unsigned long rate)
 217 {
 218         struct mdp4_dtv_encoder *mdp4_dtv_encoder = to_mdp4_dtv_encoder(encoder);
 219         return clk_round_rate(mdp4_dtv_encoder->mdp_clk, rate);
 220 }
 221
 222 /* initialize encoder */
 223 struct drm_encoder *mdp4_dtv_encoder_init(struct drm_device *dev)
 224 {
 225         struct drm_encoder *encoder = NULL;
 226         struct mdp4_dtv_encoder *mdp4_dtv_encoder;
 227         int ret;
 228
 229         mdp4_dtv_encoder = kzalloc(sizeof(*mdp4_dtv_encoder), GFP_KERNEL);
 230         if (!mdp4_dtv_encoder) {
 231                 ret = -ENOMEM;
 232                 goto fail;
 233         }
 234
 235         encoder = &mdp4_dtv_encoder->base;
 236
 237         drm_encoder_init(dev, encoder, &mdp4_dtv_encoder_funcs,
 238                          DRM_MODE_ENCODER_TMDS, NULL);
 239         drm_encoder_helper_add(encoder, &mdp4_dtv_encoder_helper_funcs);
 240
 241         mdp4_dtv_encoder->hdmi_clk = devm_clk_get(dev->dev, "hdmi_clk");
 242         if (IS_ERR(mdp4_dtv_encoder->hdmi_clk)) {
 243                 DRM_DEV_ERROR(dev->dev, "failed to get hdmi_clk\n");
 244                 ret = PTR_ERR(mdp4_dtv_encoder->hdmi_clk);
 245                 goto fail;
 246         }
 247
 248         mdp4_dtv_encoder->mdp_clk = devm_clk_get(dev->dev, "tv_clk");
 249         if (IS_ERR(mdp4_dtv_encoder->mdp_clk)) {
 250                 DRM_DEV_ERROR(dev->dev, "failed to get tv_clk\n");
 251                 ret = PTR_ERR(mdp4_dtv_encoder->mdp_clk);
 252                 goto fail;
 253         }
 254
 255         bs_init(mdp4_dtv_encoder);
 256
 257         return encoder;
 258
 259 fail:
 260         if (encoder)
 261                 mdp4_dtv_encoder_destroy(encoder);
 262
 263         return ERR_PTR(ret);
 264 }