| /* Copyright (c) 2013-2015, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/workqueue.h> |
| #include <linux/delay.h> |
| #include <linux/kobject.h> |
| #include <linux/sysfs.h> |
| |
| #include "mdss_dsi.h" |
| #include "mdss_mdp.h" |
| |
| /* |
| * mdss_check_te_status() - Check the status of panel for TE based ESD. |
| * @ctrl_pdata : dsi controller data |
| * @pstatus_data : dsi status data |
| * @interval : duration in milliseconds to schedule work queue |
| * |
| * This function is called when the TE signal from the panel doesn't arrive |
| * after 'interval' milliseconds. If the TE IRQ is not ready, the workqueue |
| * gets re-scheduled. Otherwise, report the panel to be dead due to ESD attack. |
| */ |
| static bool mdss_check_te_status(struct mdss_dsi_ctrl_pdata *ctrl_pdata, |
| struct dsi_status_data *pstatus_data, uint32_t interval) |
| { |
| bool ret; |
| |
| /* |
| * During resume, the panel status will be ON but due to race condition |
| * between ESD thread and display UNBLANK (or rather can be put as |
| * asynchronuous nature between these two threads), the ESD thread might |
| * reach this point before the TE IRQ line is enabled or before the |
| * first TE interrupt arrives after the TE IRQ line is enabled. For such |
| * cases, re-schedule the ESD thread. |
| */ |
| ret = !atomic_read(&ctrl_pdata->te_irq_ready); |
| if (ret) { |
| schedule_delayed_work(&pstatus_data->check_status, |
| msecs_to_jiffies(interval)); |
| pr_debug("%s: TE IRQ line not enabled yet\n", __func__); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * mdss_check_dsi_ctrl_status() - Check MDP5 DSI controller status periodically. |
| * @work : dsi controller status data |
| * @interval : duration in milliseconds to schedule work queue |
| * |
| * This function calls check_status API on DSI controller to send the BTA |
| * command. If DSI controller fails to acknowledge the BTA command, it sends |
| * the PANEL_ALIVE=0 status to HAL layer. |
| */ |
| void mdss_check_dsi_ctrl_status(struct work_struct *work, uint32_t interval) |
| { |
| struct dsi_status_data *pstatus_data = NULL; |
| struct mdss_panel_data *pdata = NULL; |
| struct mipi_panel_info *mipi = NULL; |
| struct mdss_dsi_ctrl_pdata *ctrl_pdata = NULL; |
| struct mdss_overlay_private *mdp5_data = NULL; |
| struct mdss_mdp_ctl *ctl = NULL; |
| int ret = 0; |
| |
| pstatus_data = container_of(to_delayed_work(work), |
| struct dsi_status_data, check_status); |
| if (!pstatus_data || !(pstatus_data->mfd)) { |
| pr_err("%s: mfd not available\n", __func__); |
| return; |
| } |
| |
| pdata = dev_get_platdata(&pstatus_data->mfd->pdev->dev); |
| if (!pdata) { |
| pr_err("%s: Panel data not available\n", __func__); |
| return; |
| } |
| mipi = &pdata->panel_info.mipi; |
| |
| ctrl_pdata = container_of(pdata, struct mdss_dsi_ctrl_pdata, |
| panel_data); |
| if (!ctrl_pdata || (!ctrl_pdata->check_status && |
| (ctrl_pdata->status_mode != ESD_TE))) { |
| pr_err("%s: DSI ctrl or status_check callback not available\n", |
| __func__); |
| return; |
| } |
| |
| if (!pdata->panel_info.esd_rdy) { |
| pr_warn("%s: unblank not complete, reschedule check status\n", |
| __func__); |
| schedule_delayed_work(&pstatus_data->check_status, |
| msecs_to_jiffies(interval)); |
| return; |
| } |
| |
| mdp5_data = mfd_to_mdp5_data(pstatus_data->mfd); |
| ctl = mfd_to_ctl(pstatus_data->mfd); |
| |
| if (!ctl) { |
| pr_err("%s: Display is off\n", __func__); |
| return; |
| } |
| |
| if (ctrl_pdata->status_mode == ESD_TE) { |
| if (mdss_check_te_status(ctrl_pdata, pstatus_data, interval)) |
| return; |
| else |
| goto status_dead; |
| } |
| |
| |
| /* |
| * TODO: Because mdss_dsi_cmd_mdp_busy has made sure DMA to |
| * be idle in mdss_dsi_cmdlist_commit, it is not necessary |
| * to acquire ov_lock in case of video mode. Removing this |
| * lock to fix issues so that ESD thread would not block other |
| * overlay operations. Need refine this lock for command mode |
| */ |
| |
| mutex_lock(&ctrl_pdata->mutex); |
| mutex_lock(&ctl->offlock); |
| if (mipi->mode == DSI_CMD_MODE) |
| mutex_lock(&mdp5_data->ov_lock); |
| |
| if (mdss_panel_is_power_off(pstatus_data->mfd->panel_power_state) || |
| pstatus_data->mfd->shutdown_pending) { |
| if (mipi->mode == DSI_CMD_MODE) |
| mutex_unlock(&mdp5_data->ov_lock); |
| mutex_unlock(&ctl->offlock); |
| mutex_unlock(&ctrl_pdata->mutex); |
| pr_err("%s: DSI turning off, avoiding panel status check\n", |
| __func__); |
| return; |
| } |
| |
| /* |
| * For the command mode panels, we return pan display |
| * IOCTL on vsync interrupt. So, after vsync interrupt comes |
| * and when DMA_P is in progress, if the panel stops responding |
| * and if we trigger BTA before DMA_P finishes, then the DSI |
| * FIFO will not be cleared since the DSI data bus control |
| * doesn't come back to the host after BTA. This may cause the |
| * display reset not to be proper. Hence, wait for DMA_P done |
| * for command mode panels before triggering BTA. |
| */ |
| if (ctl->ops.wait_pingpong) |
| ctl->ops.wait_pingpong(ctl, NULL); |
| |
| pr_debug("%s: DSI ctrl wait for ping pong done\n", __func__); |
| |
| mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_ON); |
| ret = ctrl_pdata->check_status(ctrl_pdata); |
| mdss_mdp_clk_ctrl(MDP_BLOCK_POWER_OFF); |
| |
| if (mipi->mode == DSI_CMD_MODE) |
| mutex_unlock(&mdp5_data->ov_lock); |
| mutex_unlock(&ctl->offlock); |
| mutex_unlock(&ctrl_pdata->mutex); |
| |
| if ((pstatus_data->mfd->panel_power_state == MDSS_PANEL_POWER_ON)) { |
| if (ret > 0) |
| schedule_delayed_work(&pstatus_data->check_status, |
| msecs_to_jiffies(interval)); |
| else |
| goto status_dead; |
| } |
| |
| if (pdata->panel_info.panel_force_dead) { |
| pr_debug("force_dead=%d\n", pdata->panel_info.panel_force_dead); |
| pdata->panel_info.panel_force_dead--; |
| if (!pdata->panel_info.panel_force_dead) |
| goto status_dead; |
| } |
| |
| return; |
| |
| status_dead: |
| mdss_fb_report_panel_dead(pstatus_data->mfd); |
| } |