LXR linux/drivers/gpu/drm/msm/disp/mdp4/mdp4_dsi

   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
  14struct 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
  21static 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
  27static 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
  35static const struct drm_encoder_funcs mdp4_dsi_encoder_funcs = {
  36        .destroy = mdp4_dsi_encoder_destroy,
  37};
  38
  39static 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
  93static 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
 116static 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
 140static 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 */
 147struct 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
 167fail:
 168        if (encoder)
 169                mdp4_dsi_encoder_destroy(encoder);
 170
 171        return ERR_PTR(ret);
 172}
 173