gjdwebserver-overlay/sys-kernel/pinephone-sources/files/0007-drm-bridge-dw-mipi-dsi-Fix-enable-disable-of-dsi-con.patch

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2022-01-11 10:08:21 +01:00
From: Ondrej Jirman <megous@megous.com>
Date: Sun, 17 Oct 2021 20:14:25 +0200
Subject: [PATCH 04/36] drm: bridge: dw-mipi-dsi: Fix enable/disable of dsi
controller
The driver had it all wrong. mode_set is not for enabling the
DSI controller, that should be done in pre_enable so that
panel driver can initialize the panel (working dsi controller
is needed for that). Having dsi powerup in mode_set led to
all kind of fun, because disable would be called more often
than mode_set.
The whole panel/dsi enable/disable dance is such (for future
reference):
- dsi: mode set
- panel: prepare (we turn on panel power)
- dsi: pre enable (we enable and setup DSI)
- dsi: enable (we enable video data)
- panel: enable (we configure and turn on the display)
For disable:
- panel: disable (we turn off the display nicely)
- dsi: disable (we disable DSI)
- dsi: post disable
- panel: unprepare (we power off display power, panel should
be safely sleeping now)
Signed-off-by: Ondrej Jirman <megous@megous.com>
---
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 45 +++++++++++++++++++--------
1 file changed, 32 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index e44e18a..9cce2ab 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -266,6 +266,7 @@ struct dw_mipi_dsi {
struct dw_mipi_dsi *master; /* dual-dsi master ptr */
struct dw_mipi_dsi *slave; /* dual-dsi slave ptr */
+ struct drm_display_mode mode;
const struct dw_mipi_dsi_plat_data *plat_data;
};
@@ -597,6 +598,8 @@ static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi,
{
u32 val;
+ dev_info(dsi->dev, "mode %d\n", (int)mode_flags);
+
dsi_write(dsi, DSI_PWR_UP, RESET);
if (mode_flags & MIPI_DSI_MODE_VIDEO) {
@@ -871,11 +874,20 @@ static void dw_mipi_dsi_clear_err(struct dw_mipi_dsi *dsi)
dsi_write(dsi, DSI_INT_MSK1, 0);
}
+static void dw_mipi_dsi_bridge_disable(struct drm_bridge *bridge)
+{
+ struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
+
+ dev_info(dsi->dev, "disable\n");
+}
+
static void dw_mipi_dsi_bridge_post_disable(struct drm_bridge *bridge)
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
+ dev_info(dsi->dev, "post disable\n");
+
/*
* Switch to command mode before panel-bridge post_disable &
* panel unprepare.
@@ -884,15 +896,6 @@ static void dw_mipi_dsi_bridge_post_disable(struct drm_bridge *bridge)
*/
dw_mipi_dsi_set_mode(dsi, 0);
- /*
- * TODO Only way found to call panel-bridge post_disable &
- * panel unprepare before the dsi "final" disable...
- * This needs to be fixed in the drm_bridge framework and the API
- * needs to be updated to manage our own call chains...
- */
- if (dsi->panel_bridge->funcs->post_disable)
- dsi->panel_bridge->funcs->post_disable(dsi->panel_bridge);
-
if (phy_ops->power_off)
phy_ops->power_off(dsi->plat_data->priv_data);
@@ -921,7 +924,7 @@ static unsigned int dw_mipi_dsi_get_lanes(struct dw_mipi_dsi *dsi)
return dsi->lanes;
}
-static void dw_mipi_dsi_mode_set(struct dw_mipi_dsi *dsi,
+static void dw_mipi_dsi_enable(struct dw_mipi_dsi *dsi,
const struct drm_display_mode *adjusted_mode)
{
const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
@@ -973,16 +976,30 @@ static void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
- dw_mipi_dsi_mode_set(dsi, adjusted_mode);
+ dev_info(dsi->dev, "mode set\n");
+
+ /* Store the display mode for plugin/DKMS poweron events */
+ memcpy(&dsi->mode, mode, sizeof(dsi->mode));
+}
+
+static void dw_mipi_dsi_bridge_pre_enable(struct drm_bridge *bridge)
+{
+ struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
+
+ dev_info(dsi->dev, "pre enable\n");
+
+ /* power up the dsi ctl into a command mode */
+ dw_mipi_dsi_enable(dsi, &dsi->mode);
if (dsi->slave)
- dw_mipi_dsi_mode_set(dsi->slave, adjusted_mode);
+ dw_mipi_dsi_enable(dsi->slave, &dsi->mode);
}
static void dw_mipi_dsi_bridge_enable(struct drm_bridge *bridge)
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
- /* Switch to video mode for panel-bridge enable & panel enable */
+ dev_info(dsi->dev, "enable\n");
+
dw_mipi_dsi_set_mode(dsi, MIPI_DSI_MODE_VIDEO);
if (dsi->slave)
dw_mipi_dsi_set_mode(dsi->slave, MIPI_DSI_MODE_VIDEO);
@@ -1033,7 +1050,9 @@ static int dw_mipi_dsi_bridge_attach(struct drm_bridge *bridge,
static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
.mode_set = dw_mipi_dsi_bridge_mode_set,
+ .pre_enable = dw_mipi_dsi_bridge_pre_enable,
.enable = dw_mipi_dsi_bridge_enable,
+ .disable = dw_mipi_dsi_bridge_disable,
.post_disable = dw_mipi_dsi_bridge_post_disable,
.mode_valid = dw_mipi_dsi_bridge_mode_valid,
.attach = dw_mipi_dsi_bridge_attach,