drm/bridge: cdns-dsi: Add support for pre_enable and post_enable control functions.

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

diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
index 829e1a1446567d5d66a751fb06e5c7b0bb681d01..20bece84ff8cc77cd88f01bfb2b252187e3c2efb 100644 (file)
--- 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,