mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

drm/bridge/synopsys: dsi: add dual-dsi support 

Allow to also drive a slave dw-mipi-dsi controller in a dual-dsi
setup. This will require additional implementation-specific
code to look up the slave instance and do specific setup.
Also will probably need code in the specific crtcs as dual-dsi
does not equal two separate dsi outputs.

To activate, the implementation-specific code should set the slave
using dw_mipi_dsi_set_slave() before calling __dw_mipi_dsi_bind().

v2:
- expect real interface number of lanes
- keep links to both master and slave
v3:
- remove unneeded separate variables
- remove unneeded second slave settings
- disable slave before master
- lane-sum calculation comments

Signed-off-by: Nickey Yang <nickey.yang@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Philippe Cornu <philippe.cornu@st.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181001123845.11818-7-heiko@sntech.de
This commit is contained in:
Nickey Yang 2018-10-01 14:38:44 +02:00 committed by Andrzej Hajda
parent 2d4f7bdafd
commit 739838b5f8
2 changed files with 75 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
View File

@ -230,9 +230,20 @@ struct dw_mipi_dsi {
u32 format;
unsigned long mode_flags;
struct dw_mipi_dsi *master; /* dual-dsi master ptr */
struct dw_mipi_dsi *slave; /* dual-dsi slave ptr */
const struct dw_mipi_dsi_plat_data *plat_data;
};
/*
* Check if either a link to a master or slave is present
*/
static inline bool dw_mipi_is_dual_mode(struct dw_mipi_dsi *dsi)
{
return dsi->slave || dsi->master;
}
/*
* The controller should generate 2 frames before
* preparing the peripheral.
@ -456,10 +467,17 @@ static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
}
dw_mipi_message_config(dsi, msg);
if (dsi->slave)
dw_mipi_message_config(dsi->slave, msg);
ret = dw_mipi_dsi_write(dsi, &packet);
if (ret)
return ret;
if (dsi->slave) {
ret = dw_mipi_dsi_write(dsi->slave, &packet);
if (ret)
return ret;
}
if (msg->rx_buf && msg->rx_len) {
ret = dw_mipi_dsi_read(dsi, msg);
@ -598,7 +616,11 @@ static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
* DSI_VNPCR.NPSIZE... especially because this driver supports
* non-burst video modes, see dw_mipi_dsi_video_mode_config()...
*/
dsi_write(dsi, DSI_VID_PKT_SIZE, VID_PKT_SIZE(mode->hdisplay));
dsi_write(dsi, DSI_VID_PKT_SIZE,
dw_mipi_is_dual_mode(dsi) ?
VID_PKT_SIZE(mode->hdisplay / 2) :
VID_PKT_SIZE(mode->hdisplay));
}
static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
@ -770,24 +792,43 @@ static void dw_mipi_dsi_bridge_post_disable(struct drm_bridge *bridge)
*/
dsi->panel_bridge->funcs->post_disable(dsi->panel_bridge);
if (dsi->slave) {
dw_mipi_dsi_disable(dsi->slave);
clk_disable_unprepare(dsi->slave->pclk);
pm_runtime_put(dsi->slave->dev);
}
dw_mipi_dsi_disable(dsi);
clk_disable_unprepare(dsi->pclk);
pm_runtime_put(dsi->dev);
}
static void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
static unsigned int dw_mipi_dsi_get_lanes(struct dw_mipi_dsi *dsi)
{
/* this instance is the slave, so add the master's lanes */
if (dsi->master)
return dsi->master->lanes + dsi->lanes;
/* this instance is the master, so add the slave's lanes */
if (dsi->slave)
return dsi->lanes + dsi->slave->lanes;
/* single-dsi, so no other instance to consider */
return dsi->lanes;
}
static void dw_mipi_dsi_mode_set(struct dw_mipi_dsi *dsi,
struct drm_display_mode *adjusted_mode)
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
void *priv_data = dsi->plat_data->priv_data;
int ret;
u32 lanes = dw_mipi_dsi_get_lanes(dsi);
clk_prepare_enable(dsi->pclk);
ret = phy_ops->get_lane_mbps(priv_data, adjusted_mode, dsi->mode_flags,
dsi->lanes, dsi->format, &dsi->lane_mbps);
lanes, dsi->format, &dsi->lane_mbps);
if (ret)
DRM_DEBUG_DRIVER("Phy get_lane_mbps() failed\n");
@ -819,12 +860,25 @@ static void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
dw_mipi_dsi_set_mode(dsi, 0);
}
static void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
dw_mipi_dsi_mode_set(dsi, adjusted_mode);
if (dsi->slave)
dw_mipi_dsi_mode_set(dsi->slave, adjusted_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 */
dw_mipi_dsi_set_mode(dsi, MIPI_DSI_MODE_VIDEO);
if (dsi->slave)
dw_mipi_dsi_set_mode(dsi->slave, MIPI_DSI_MODE_VIDEO);
}
static enum drm_mode_status
@ -961,6 +1015,20 @@ static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
pm_runtime_disable(dsi->dev);
}
void dw_mipi_dsi_set_slave(struct dw_mipi_dsi *dsi, struct dw_mipi_dsi *slave)
{
/* introduce controllers to each other */
dsi->slave = slave;
dsi->slave->master = dsi;
/* migrate settings for already attached displays */
dsi->slave->lanes = dsi->lanes;
dsi->slave->channel = dsi->channel;
dsi->slave->format = dsi->format;
dsi->slave->mode_flags = dsi->mode_flags;
}
EXPORT_SYMBOL_GPL(dw_mipi_dsi_set_slave);
/*
* Probe/remove API, used from platforms based on the DRM bridge API.
*/

1
include/drm/bridge/dw_mipi_dsi.h
View File

@ -45,5 +45,6 @@ struct dw_mipi_dsi *dw_mipi_dsi_probe(struct platform_device *pdev,
void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi);
int dw_mipi_dsi_bind(struct dw_mipi_dsi *dsi, struct drm_encoder *encoder);
void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi);
void dw_mipi_dsi_set_slave(struct dw_mipi_dsi *dsi, struct dw_mipi_dsi *slave);
#endif /* __DW_MIPI_DSI__ */