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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
   4  * Copyright (c) 2014, Inforce Computing. All rights reserved.
   5  *
   6  * Author: Vinay Simha <vinaysimha@inforcecomputing.com>
   7  */
   8
   9 #include <drm/drm_crtc.h>
  10 #include <drm/drm_probe_helper.h>
  11
  12 #include "mdp4_kms.h"
  13
  14 struct mdp4_dsi_encoder {
  15         struct drm_encoder base;
  16         struct drm_panel *panel;
  17         bool enabled;
  18 };
  19 #define to_mdp4_dsi_encoder(x) container_of(x, struct mdp4_dsi_encoder, base)
  20
  21 static struct mdp4_kms *get_kms(struct drm_encoder *encoder)
  22 {
  23         struct msm_drm_private *priv = encoder->dev->dev_private;
  24         return to_mdp4_kms(to_mdp_kms(priv->kms));
  25 }
  26
  27 static void mdp4_dsi_encoder_destroy(struct drm_encoder *encoder)
  28 {
  29         struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder);
  30
  31         drm_encoder_cleanup(encoder);
  32         kfree(mdp4_dsi_encoder);
  33 }
  34
  35 static const struct drm_encoder_funcs mdp4_dsi_encoder_funcs = {
  36         .destroy = mdp4_dsi_encoder_destroy,
  37 };
  38
  39 static void mdp4_dsi_encoder_mode_set(struct drm_encoder *encoder,
  40                                       struct drm_display_mode *mode,
  41                                       struct drm_display_mode *adjusted_mode)
  42 {
  43         struct mdp4_kms *mdp4_kms = get_kms(encoder);
  44         uint32_t dsi_hsync_skew, vsync_period, vsync_len, ctrl_pol;
  45         uint32_t display_v_start, display_v_end;
  46         uint32_t hsync_start_x, hsync_end_x;
  47
  48         mode = adjusted_mode;
  49
  50         DBG("set mode: " DRM_MODE_FMT, DRM_MODE_ARG(mode));
  51
  52         ctrl_pol = 0;
  53         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
  54                 ctrl_pol |= MDP4_DSI_CTRL_POLARITY_HSYNC_LOW;
  55         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
  56                 ctrl_pol |= MDP4_DSI_CTRL_POLARITY_VSYNC_LOW;
  57         /* probably need to get DATA_EN polarity from panel.. */
  58
  59         dsi_hsync_skew = 0;  /* get this from panel? */
  60
  61         hsync_start_x = (mode->htotal - mode->hsync_start);
  62         hsync_end_x = mode->htotal - (mode->hsync_start - mode->hdisplay) - 1;
  63
  64         vsync_period = mode->vtotal * mode->htotal;
  65         vsync_len = (mode->vsync_end - mode->vsync_start) * mode->htotal;
  66         display_v_start = (mode->vtotal - mode->vsync_start) * mode->htotal + dsi_hsync_skew;
  67         display_v_end = vsync_period - ((mode->vsync_start - mode->vdisplay) * mode->htotal) + dsi_hsync_skew - 1;
  68
  69         mdp4_write(mdp4_kms, REG_MDP4_DSI_HSYNC_CTRL,
  70                         MDP4_DSI_HSYNC_CTRL_PULSEW(mode->hsync_end - mode->hsync_start) |
  71                         MDP4_DSI_HSYNC_CTRL_PERIOD(mode->htotal));
  72         mdp4_write(mdp4_kms, REG_MDP4_DSI_VSYNC_PERIOD, vsync_period);
  73         mdp4_write(mdp4_kms, REG_MDP4_DSI_VSYNC_LEN, vsync_len);
  74         mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_HCTRL,
  75                         MDP4_DSI_DISPLAY_HCTRL_START(hsync_start_x) |
  76                         MDP4_DSI_DISPLAY_HCTRL_END(hsync_end_x));
  77         mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_VSTART, display_v_start);
  78         mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_VEND, display_v_end);
  79
  80         mdp4_write(mdp4_kms, REG_MDP4_DSI_CTRL_POLARITY, ctrl_pol);
  81         mdp4_write(mdp4_kms, REG_MDP4_DSI_UNDERFLOW_CLR,
  82                         MDP4_DSI_UNDERFLOW_CLR_ENABLE_RECOVERY |
  83                         MDP4_DSI_UNDERFLOW_CLR_COLOR(0xff));
  84         mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_HCTL,
  85                         MDP4_DSI_ACTIVE_HCTL_START(0) |
  86                         MDP4_DSI_ACTIVE_HCTL_END(0));
  87         mdp4_write(mdp4_kms, REG_MDP4_DSI_HSYNC_SKEW, dsi_hsync_skew);
  88         mdp4_write(mdp4_kms, REG_MDP4_DSI_BORDER_CLR, 0);
  89         mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_VSTART, 0);
  90         mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_VEND, 0);
  91 }
  92
  93 static void mdp4_dsi_encoder_disable(struct drm_encoder *encoder)
  94 {
  95         struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder);
  96         struct mdp4_kms *mdp4_kms = get_kms(encoder);
  97
  98         if (!mdp4_dsi_encoder->enabled)
  99                 return;
 100
 101         mdp4_write(mdp4_kms, REG_MDP4_DSI_ENABLE, 0);
 102
 103         /*
 104          * Wait for a vsync so we know the ENABLE=0 latched before
 105          * the (connector) source of the vsync's gets disabled,
 106          * otherwise we end up in a funny state if we re-enable
 107          * before the disable latches, which results that some of
 108          * the settings changes for the new modeset (like new
 109          * scanout buffer) don't latch properly..
 110          */
 111         mdp_irq_wait(&mdp4_kms->base, MDP4_IRQ_PRIMARY_VSYNC);
 112
 113         mdp4_dsi_encoder->enabled = false;
 114 }
 115
 116 static void mdp4_dsi_encoder_enable(struct drm_encoder *encoder)
 117 {
 118         struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder);
 119         struct mdp4_kms *mdp4_kms = get_kms(encoder);
 120
 121         if (mdp4_dsi_encoder->enabled)
 122                 return;
 123
 124         mdp4_crtc_set_config(encoder->crtc,
 125                         MDP4_DMA_CONFIG_PACK_ALIGN_MSB |
 126                         MDP4_DMA_CONFIG_DEFLKR_EN |
 127                         MDP4_DMA_CONFIG_DITHER_EN |
 128                         MDP4_DMA_CONFIG_R_BPC(BPC8) |
 129                         MDP4_DMA_CONFIG_G_BPC(BPC8) |
 130                         MDP4_DMA_CONFIG_B_BPC(BPC8) |
 131                         MDP4_DMA_CONFIG_PACK(0x21));
 132
 133         mdp4_crtc_set_intf(encoder->crtc, INTF_DSI_VIDEO, 0);
 134
 135         mdp4_write(mdp4_kms, REG_MDP4_DSI_ENABLE, 1);
 136
 137         mdp4_dsi_encoder->enabled = true;
 138 }
 139
 140 static const struct drm_encoder_helper_funcs mdp4_dsi_encoder_helper_funcs = {
 141         .mode_set = mdp4_dsi_encoder_mode_set,
 142         .disable = mdp4_dsi_encoder_disable,
 143         .enable = mdp4_dsi_encoder_enable,
 144 };
 145
 146 /* initialize encoder */
 147 struct drm_encoder *mdp4_dsi_encoder_init(struct drm_device *dev)
 148 {
 149         struct drm_encoder *encoder = NULL;
 150         struct mdp4_dsi_encoder *mdp4_dsi_encoder;
 151         int ret;
 152
 153         mdp4_dsi_encoder = kzalloc(sizeof(*mdp4_dsi_encoder), GFP_KERNEL);
 154         if (!mdp4_dsi_encoder) {
 155                 ret = -ENOMEM;
 156                 goto fail;
 157         }
 158
 159         encoder = &mdp4_dsi_encoder->base;
 160
 161         drm_encoder_init(dev, encoder, &mdp4_dsi_encoder_funcs,
 162                          DRM_MODE_ENCODER_DSI, NULL);
 163         drm_encoder_helper_add(encoder, &mdp4_dsi_encoder_helper_funcs);
 164
 165         return encoder;
 166
 167 fail:
 168         if (encoder)
 169                 mdp4_dsi_encoder_destroy(encoder);
 170
 171         return ERR_PTR(ret);
 172 }