From d3fbd5bd8e6d348cb0ed54f7d43e0735d2f6a5bc Mon Sep 17 00:00:00 2001
From: Jayshri Pawar <jpawar@cadence.com>
Date: Mon, 11 Apr 2022 16:06:06 +0200
Subject: drm/bridge: cdns-dsi: Add support for pre_enable and post_enable
control functions.
Git-commit: aebeb02dfccb61d6930112aede2db3db5b8e974e
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
Add support for pre_enable and post_enable drm bridge control functions.
Making sure that host to be prepared before panel is powered up,
for the panels like TC358762.
Signed-off-by: Jayshri Pawar <jpawar@cadence.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220411140606.15654-1-jpawar@cadence.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/bridge/cdns-dsi.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
index 829e1a144656..20bece84ff8c 100644
--- a/drivers/gpu/drm/bridge/cdns-dsi.c
+++ b/drivers/gpu/drm/bridge/cdns-dsi.c
@@ -462,6 +462,7 @@ struct cdns_dsi {
struct reset_control *dsi_p_rst;
struct clk *dsi_sys_clk;
bool link_initialized;
+ bool phy_initialized;
struct phy *dphy;
};
@@ -711,11 +712,21 @@ static void cdns_dsi_bridge_disable(struct drm_bridge *bridge)
pm_runtime_put(dsi->base.dev);
}
+static void cdns_dsi_bridge_post_disable(struct drm_bridge *bridge)
+{
+ struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
+ struct cdns_dsi *dsi = input_to_dsi(input);
+
+ pm_runtime_put(dsi->base.dev);
+}
+
static void cdns_dsi_hs_init(struct cdns_dsi *dsi)
{
struct cdns_dsi_output *output = &dsi->output;
u32 status;
+ if (dsi->phy_initialized)
+ return;
/*
* Power all internal DPHY blocks down and maintain their reset line
* asserted before changing the DPHY config.
@@ -739,6 +750,7 @@ static void cdns_dsi_hs_init(struct cdns_dsi *dsi)
writel(DPHY_CMN_PSO | DPHY_ALL_D_PDN | DPHY_C_PDN | DPHY_CMN_PDN |
DPHY_D_RSTB(output->dev->lanes) | DPHY_C_RSTB,
dsi->regs + MCTL_DPHY_CFG0);
+ dsi->phy_initialized = true;
}
static void cdns_dsi_init_link(struct cdns_dsi *dsi)
@@ -914,11 +926,25 @@ static void cdns_dsi_bridge_enable(struct drm_bridge *bridge)
writel(tmp, dsi->regs + MCTL_MAIN_EN);
}
+static void cdns_dsi_bridge_pre_enable(struct drm_bridge *bridge)
+{
+ struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
+ struct cdns_dsi *dsi = input_to_dsi(input);
+
+ if (WARN_ON(pm_runtime_get_sync(dsi->base.dev) < 0))
+ return;
+
+ cdns_dsi_init_link(dsi);
+ cdns_dsi_hs_init(dsi);
+}
+
static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
.attach = cdns_dsi_bridge_attach,
.mode_valid = cdns_dsi_bridge_mode_valid,
.disable = cdns_dsi_bridge_disable,
+ .pre_enable = cdns_dsi_bridge_pre_enable,
.enable = cdns_dsi_bridge_enable,
+ .post_disable = cdns_dsi_bridge_post_disable,
};
static int cdns_dsi_attach(struct mipi_dsi_host *host,
--
2.38.1