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disp: msm: dsi: enable DMA start window scheduling for broadcast commands

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As per the HW requirements it is highly recommended to use DMA start window
to trigger broadcast commands. If not used then it can result in a hardware
hang with the DSI controllers going out of sync. This behavior is even more
prominent in cases of higher refresh rates.

Currently, reset_trigger_controls is called as part of next command.
Due to this, when unicast command is sent after broadcast command,
reset_trigger_controls does not get called for slave controller,
leading to issues.

As part of this change, DMA start window scheduling is enabled as default
for broadcast commands and reset_trigger_controls is done as part of
post_cmd_transfer operations.

Change-Id: I2402214ed79b376d102b88d4f7e6a06fcb5712d3
Signed-off-by: Ritesh Kumar <quic_riteshk@quicinc.com>
This commit is contained in:
Ritesh Kumar
2021-12-23 16:25:13 +05:30
parent 4cc5b3cabb
commit fd2dc5be06
2 changed files with 12 additions and 5 deletions
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7
msm/dsi/dsi_display.c
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@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
* Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.
*/
@@ -704,14 +705,18 @@ static void dsi_display_set_cmd_tx_ctrl_flags(struct dsi_display *display,
/*
* Set flags for command scheduling.
* 1) In video mode command DMA scheduling is default.
* 2) In command mode command DMA scheduling depends on message
* 2) In command mode unicast command DMA scheduling depends on message
* flag and TE needs to be running.
* 3) In command mode broadcast command DMA scheduling is default and
* TE needs to be running.
*/
if (display->panel->panel_mode == DSI_OP_VIDEO_MODE) {
flags |= DSI_CTRL_CMD_CUSTOM_DMA_SCHED;
} else {
if (msg->flags & MIPI_DSI_MSG_CMD_DMA_SCHED)
flags |= DSI_CTRL_CMD_CUSTOM_DMA_SCHED;
if (flags & DSI_CTRL_CMD_BROADCAST)
flags |= DSI_CTRL_CMD_CUSTOM_DMA_SCHED;
if (!display->enabled)
flags &= ~DSI_CTRL_CMD_CUSTOM_DMA_SCHED;
}