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 <drm/drm_crtc.h> 21 #include <drm/drm_probe_helper.h> 22 23 #include "mdp4_kms.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: " DRM_MODE_FMT, DRM_MODE_ARG(mode)); 62 63 ctrl_pol = 0; 64 if (mode->flags & DRM_MODE_FLAG_NHSYNC) 65 ctrl_pol |= MDP4_DSI_CTRL_POLARITY_HSYNC_LOW; 66 if (mode->flags & DRM_MODE_FLAG_NVSYNC) 67 ctrl_pol |= MDP4_DSI_CTRL_POLARITY_VSYNC_LOW; 68 /* probably need to get DATA_EN polarity from panel.. */ 69 70 dsi_hsync_skew = 0; /* get this from panel? */ 71 72 hsync_start_x = (mode->htotal - mode->hsync_start); 73 hsync_end_x = mode->htotal - (mode->hsync_start - mode->hdisplay) - 1; 74 75 vsync_period = mode->vtotal * mode->htotal; 76 vsync_len = (mode->vsync_end - mode->vsync_start) * mode->htotal; 77 display_v_start = (mode->vtotal - mode->vsync_start) * mode->htotal + dsi_hsync_skew; 78 display_v_end = vsync_period - ((mode->vsync_start - mode->vdisplay) * mode->htotal) + dsi_hsync_skew - 1; 79 80 mdp4_write(mdp4_kms, REG_MDP4_DSI_HSYNC_CTRL, 81 MDP4_DSI_HSYNC_CTRL_PULSEW(mode->hsync_end - mode->hsync_start) | 82 MDP4_DSI_HSYNC_CTRL_PERIOD(mode->htotal)); 83 mdp4_write(mdp4_kms, REG_MDP4_DSI_VSYNC_PERIOD, vsync_period); 84 mdp4_write(mdp4_kms, REG_MDP4_DSI_VSYNC_LEN, vsync_len); 85 mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_HCTRL, 86 MDP4_DSI_DISPLAY_HCTRL_START(hsync_start_x) | 87 MDP4_DSI_DISPLAY_HCTRL_END(hsync_end_x)); 88 mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_VSTART, display_v_start); 89 mdp4_write(mdp4_kms, REG_MDP4_DSI_DISPLAY_VEND, display_v_end); 90 91 mdp4_write(mdp4_kms, REG_MDP4_DSI_CTRL_POLARITY, ctrl_pol); 92 mdp4_write(mdp4_kms, REG_MDP4_DSI_UNDERFLOW_CLR, 93 MDP4_DSI_UNDERFLOW_CLR_ENABLE_RECOVERY | 94 MDP4_DSI_UNDERFLOW_CLR_COLOR(0xff)); 95 mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_HCTL, 96 MDP4_DSI_ACTIVE_HCTL_START(0) | 97 MDP4_DSI_ACTIVE_HCTL_END(0)); 98 mdp4_write(mdp4_kms, REG_MDP4_DSI_HSYNC_SKEW, dsi_hsync_skew); 99 mdp4_write(mdp4_kms, REG_MDP4_DSI_BORDER_CLR, 0); 100 mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_VSTART, 0); 101 mdp4_write(mdp4_kms, REG_MDP4_DSI_ACTIVE_VEND, 0); 102 } 103 104 static void mdp4_dsi_encoder_disable(struct drm_encoder *encoder) 105 { 106 struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder); 107 struct mdp4_kms *mdp4_kms = get_kms(encoder); 108 109 if (!mdp4_dsi_encoder->enabled) 110 return; 111 112 mdp4_write(mdp4_kms, REG_MDP4_DSI_ENABLE, 0); 113 114 /* 115 * Wait for a vsync so we know the ENABLE=0 latched before 116 * the (connector) source of the vsync's gets disabled, 117 * otherwise we end up in a funny state if we re-enable 118 * before the disable latches, which results that some of 119 * the settings changes for the new modeset (like new 120 * scanout buffer) don't latch properly.. 121 */ 122 mdp_irq_wait(&mdp4_kms->base, MDP4_IRQ_PRIMARY_VSYNC); 123 124 mdp4_dsi_encoder->enabled = false; 125 } 126 127 static void mdp4_dsi_encoder_enable(struct drm_encoder *encoder) 128 { 129 struct mdp4_dsi_encoder *mdp4_dsi_encoder = to_mdp4_dsi_encoder(encoder); 130 struct mdp4_kms *mdp4_kms = get_kms(encoder); 131 132 if (mdp4_dsi_encoder->enabled) 133 return; 134 135 mdp4_crtc_set_config(encoder->crtc, 136 MDP4_DMA_CONFIG_PACK_ALIGN_MSB | 137 MDP4_DMA_CONFIG_DEFLKR_EN | 138 MDP4_DMA_CONFIG_DITHER_EN | 139 MDP4_DMA_CONFIG_R_BPC(BPC8) | 140 MDP4_DMA_CONFIG_G_BPC(BPC8) | 141 MDP4_DMA_CONFIG_B_BPC(BPC8) | 142 MDP4_DMA_CONFIG_PACK(0x21)); 143 144 mdp4_crtc_set_intf(encoder->crtc, INTF_DSI_VIDEO, 0); 145 146 mdp4_write(mdp4_kms, REG_MDP4_DSI_ENABLE, 1); 147 148 mdp4_dsi_encoder->enabled = true; 149 } 150 151 static const struct drm_encoder_helper_funcs mdp4_dsi_encoder_helper_funcs = { 152 .mode_set = mdp4_dsi_encoder_mode_set, 153 .disable = mdp4_dsi_encoder_disable, 154 .enable = mdp4_dsi_encoder_enable, 155 }; 156 157 /* initialize encoder */ 158 struct drm_encoder *mdp4_dsi_encoder_init(struct drm_device *dev) 159 { 160 struct drm_encoder *encoder = NULL; 161 struct mdp4_dsi_encoder *mdp4_dsi_encoder; 162 int ret; 163 164 mdp4_dsi_encoder = kzalloc(sizeof(*mdp4_dsi_encoder), GFP_KERNEL); 165 if (!mdp4_dsi_encoder) { 166 ret = -ENOMEM; 167 goto fail; 168 } 169 170 encoder = &mdp4_dsi_encoder->base; 171 172 drm_encoder_init(dev, encoder, &mdp4_dsi_encoder_funcs, 173 DRM_MODE_ENCODER_DSI, NULL); 174 drm_encoder_helper_add(encoder, &mdp4_dsi_encoder_helper_funcs); 175 176 return encoder; 177 178 fail: 179 if (encoder) 180 mdp4_dsi_encoder_destroy(encoder); 181 182 return ERR_PTR(ret); 183 } 184