From: jpawar jpawar@cadence.com
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: jpawar jpawar@cadence.com --- 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,