drivers/gpu/drm/msm/mdp/mdp4/mdp4_dsi_encoder.c

   1 /*
   2  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   3  * Copyright (c) 2014, Inforce Computing. All rights reserved.
   4  *
   5  * Author: Vinay Simha <vinaysimha@inforcecomputing.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "mdp4_kms.h"
  21
  22 #include "drm_crtc.h"
  23 #include "drm_crtc_helper.h"
  24
  25 struct mdp4_dsi_encoder {
  26         struct drm_encoder base;
  27         struct drm_panel *panel;
  28         bool enabled;
  29 };
  30 #define to_mdp4_dsi_encoder(x) container_of(x, struct mdp4_dsi_encoder, base)
  31
  32 static struct mdp4_kms *get_kms(struct drm_encoder *encoder)
  33 {
  34         struct msm_drm_private *priv = encoder->dev->dev_private;
  35         return to_mdp4_kms(to_mdp_kms(priv->kms));
  36 }
  37
  38 static void mdp4_dsi_encoder_destroy(struct drm_encoder *encoder)
  39 {
  40         struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder);
  41
  42         drm_encoder_cleanup(encoder);
  43         kfree(mdp4_dsi_encoder);
  44 }
  45
  46 static const struct drm_encoder_funcs mdp4_dsi_encoder_funcs = {
  47         .destroy = mdp4_dsi_encoder_destroy,
  48 };
  49
  50 static void mdp4_dsi_encoder_mode_set(struct drm_encoder *encoder,
  51                                       struct drm_display_mode *mode,
  52                                       struct drm_display_mode *adjusted_mode)
  53 {
  54         struct mdp4_kms *mdp4_kms = get_kms(encoder);
  55         uint32_t dsi_hsync_skew, vsync_period, vsync_len, ctrl_pol;
  56         uint32_t display_v_start, display_v_end;
  57         uint32_t hsync_start_x, hsync_end_x;
  58
  59         mode = adjusted_mode;
  60
  61         DBG("set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
  62                         mode->base.id, mode->name,
  63                         mode->vrefresh, mode->clock,
  64                         mode->hdisplay, mode->hsync_start,
  65                         mode->hsync_end, mode->htotal,
  66                         mode->vdisplay, mode->vsync_start,
  67                         mode->vsync_end, mode->vtotal,
  68                         mode->type, mode->flags);
  69
  70         ctrl_pol = 0;
  71         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
  72                 ctrl_pol |= MDP4_DSI_CTRL_POLARITY_HSYNC_LOW;
  73         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
  74                 ctrl_pol |= MDP4_DSI_CTRL_POLARITY_VSYNC_LOW;
  75         /* probably need to get DATA_EN polarity from panel.. */
  76
  77         dsi_hsync_skew = 0;  /* get this from panel? */
  78
  79         hsync_start_x = (mode->htotal - mode->hsync_start);
  80         hsync_end_x = mode->htotal - (mode->hsync_start - mode->hdisplay) - 1;
  81
  82         vsync_period = mode->vtotal * mode->htotal;
  83         vsync_len = (mode->vsync_end - mode->vsync_start) * mode->htotal;
  84         display_v_start = (mode->vtotal - mode->vsync_start) * mode->htotal + dsi_hsync_skew;
  85         display_v_end = vsync_period - ((mode->vsync_start - mode->vdisplay) * mode->htotal) + dsi_hsync_skew - 1;
  86
  87         mdp4_write(mdp4_kms, REG_MDP4_DSI_HSYNC_CTRL,
  88                         MDP4_DSI_HSYNC_CTRL_PULSEW(mode->hsync_end - mode->hsync_start) |
  89                         MDP4_DSI_HSYNC_CTRL_PERIOD(mode->htotal));
  90         mdp4_write(mdp4_kms, REG_MDP4_DSI_VSYNC_PERIOD, vsync_period);
  91         mdp4_write(mdp4_kms, REG_MDP4_DSI_VSYNC_LEN, vsync_len);
  92         mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_HCTRL,
  93                         MDP4_DSI_DISPLAY_HCTRL_START(hsync_start_x) |
  94                         MDP4_DSI_DISPLAY_HCTRL_END(hsync_end_x));
  95         mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_VSTART, display_v_start);
  96         mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_VEND, display_v_end);
  97
  98         mdp4_write(mdp4_kms, REG_MDP4_DSI_CTRL_POLARITY, ctrl_pol);
  99         mdp4_write(mdp4_kms, REG_MDP4_DSI_UNDERFLOW_CLR,
 100                         MDP4_DSI_UNDERFLOW_CLR_ENABLE_RECOVERY |
 101                         MDP4_DSI_UNDERFLOW_CLR_COLOR(0xff));
 102         mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_HCTL,
 103                         MDP4_DSI_ACTIVE_HCTL_START(0) |
 104                         MDP4_DSI_ACTIVE_HCTL_END(0));
 105         mdp4_write(mdp4_kms, REG_MDP4_DSI_HSYNC_SKEW, dsi_hsync_skew);
 106         mdp4_write(mdp4_kms, REG_MDP4_DSI_BORDER_CLR, 0);
 107         mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_VSTART, 0);
 108         mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_VEND, 0);
 109 }
 110
 111 static void mdp4_dsi_encoder_disable(struct drm_encoder *encoder)
 112 {
 113         struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder);
 114         struct mdp4_kms *mdp4_kms = get_kms(encoder);
 115
 116         if (!mdp4_dsi_encoder->enabled)
 117                 return;
 118
 119         mdp4_write(mdp4_kms, REG_MDP4_DSI_ENABLE, 0);
 120
 121         /*
 122          * Wait for a vsync so we know the ENABLE=0 latched before
 123          * the (connector) source of the vsync's gets disabled,
 124          * otherwise we end up in a funny state if we re-enable
 125          * before the disable latches, which results that some of
 126          * the settings changes for the new modeset (like new
 127          * scanout buffer) don't latch properly..
 128          */
 129         mdp_irq_wait(&mdp4_kms->base, MDP4_IRQ_PRIMARY_VSYNC);
 130
 131         mdp4_dsi_encoder->enabled = false;
 132 }
 133
 134 static void mdp4_dsi_encoder_enable(struct drm_encoder *encoder)
 135 {
 136         struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder);
 137         struct mdp4_kms *mdp4_kms = get_kms(encoder);
 138
 139         if (mdp4_dsi_encoder->enabled)
 140                 return;
 141
 142          mdp4_crtc_set_config(encoder->crtc,
 143                         MDP4_DMA_CONFIG_PACK_ALIGN_MSB |
 144                         MDP4_DMA_CONFIG_DEFLKR_EN |
 145                         MDP4_DMA_CONFIG_DITHER_EN |
 146                         MDP4_DMA_CONFIG_R_BPC(BPC8) |
 147                         MDP4_DMA_CONFIG_G_BPC(BPC8) |
 148                         MDP4_DMA_CONFIG_B_BPC(BPC8) |
 149                         MDP4_DMA_CONFIG_PACK(0x21));
 150
 151         mdp4_crtc_set_intf(encoder->crtc, INTF_DSI_VIDEO, 0);
 152
 153         mdp4_write(mdp4_kms, REG_MDP4_DSI_ENABLE, 1);
 154
 155         mdp4_dsi_encoder->enabled = true;
 156 }
 157
 158 static const struct drm_encoder_helper_funcs mdp4_dsi_encoder_helper_funcs = {
 159         .mode_set = mdp4_dsi_encoder_mode_set,
 160         .disable = mdp4_dsi_encoder_disable,
 161         .enable = mdp4_dsi_encoder_enable,
 162 };
 163
 164 /* initialize encoder */
 165 struct drm_encoder *mdp4_dsi_encoder_init(struct drm_device *dev)
 166 {
 167         struct drm_encoder *encoder = NULL;
 168         struct mdp4_dsi_encoder *mdp4_dsi_encoder;
 169         int ret;
 170
 171         mdp4_dsi_encoder = kzalloc(sizeof(*mdp4_dsi_encoder), GFP_KERNEL);
 172         if (!mdp4_dsi_encoder) {
 173                 ret = -ENOMEM;
 174                 goto fail;
 175         }
 176
 177         encoder = &mdp4_dsi_encoder->base;
 178
 179         drm_encoder_init(dev, encoder, &mdp4_dsi_encoder_funcs,
 180                          DRM_MODE_ENCODER_DSI, NULL);
 181         drm_encoder_helper_add(encoder, &mdp4_dsi_encoder_helper_funcs);
 182
 183         return encoder;
 184
 185 fail:
 186         if (encoder)
 187                 mdp4_dsi_encoder_destroy(encoder);
 188
 189         return ERR_PTR(ret);
 190 }