video: tegra: dc: When DSI is disabled, set PAD_PDVREG in MIPI_BIAS_PAD_CFG2

As per recommendation from HW team, when DSI is disabled, power down voltage regulator
in MIPI bias pad configuration register 2.

Bug 200149284

Change-Id: I026c72010972e33e8adc71207c2891ed5daf92df
Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Reviewed-on: http://git-master/r/1182695
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>

1 files changed, 27 insertions, 4 deletions

diff --git a/drivers/video/tegra/dc/dsi.c b/drivers/video/tegra/dc/dsi.c
index c499f1d69..234de06ce 100644
--- a/drivers/video/tegra/dc/dsi.c
+++ b/drivers/video/tegra/dc/dsi.c
@@ -4574,12 +4574,30 @@ static void tegra_dc_dsi_enable(struct tegra_dc *dc)
 {
         struct tegra_dc_dsi_data *dsi = tegra_dc_get_outdata(dc);
         int err = 0;
+#if defined(CONFIG_ARCH_TEGRA_18x_SOC)
+        int val;
+#endif
+
 #ifdef CONFIG_SYSEDP_FRAMEWORK
         sysedp_set_state(dsi->sysedpc, 1);
 #endif
         mutex_lock(&dsi->lock);
         tegra_dc_io_start(dc);
 
+#if defined(CONFIG_ARCH_TEGRA_18x_SOC)
+        if (dsi->pad_ctrl)
+                tegra_dsi_padctrl_enable(dsi->pad_ctrl);
+
+        /* Disable mipi bias pad power down */
+        tegra_mipi_cal_clk_enable(dsi->mipi_cal);
+        val = tegra_mipi_cal_read(dsi->mipi_cal,
+                        MIPI_CAL_MIPI_BIAS_PAD_CFG2_0);
+        val &= ~PAD_PDVREG(1);
+        tegra_mipi_cal_write(dsi->mipi_cal, val,
+                        MIPI_CAL_MIPI_BIAS_PAD_CFG2_0);
+        tegra_mipi_cal_clk_disable(dsi->mipi_cal);
+#endif
+
         /*
          * Do not program this panel as the bootloader as has already
          * initialized it. This avoids periods of blanking during boot.
@@ -4589,10 +4607,6 @@ static void tegra_dc_dsi_enable(struct tegra_dc *dc)
                 goto fail;
         }
 
-#if defined(CONFIG_ARCH_TEGRA_18x_SOC)
-        if (dsi->pad_ctrl)
-                tegra_dsi_padctrl_enable(dsi->pad_ctrl);
-#endif
         /* Stop DC stream before configuring DSI registers
          * to avoid visible glitches on panel during transition
          * from bootloader to kernel driver
@@ -5565,6 +5579,15 @@ static int tegra_dsi_deep_sleep(struct tegra_dc *dc,
 #if defined(CONFIG_ARCH_TEGRA_18x_SOC)
         if (dsi->pad_ctrl)
                 tegra_dsi_padctrl_disable(dsi->pad_ctrl);
+
+        /* Enable mipi bias pad power down */
+        tegra_mipi_cal_clk_enable(dsi->mipi_cal);
+        val = tegra_mipi_cal_read(dsi->mipi_cal,
+                        MIPI_CAL_MIPI_BIAS_PAD_CFG2_0);
+        val |= PAD_PDVREG(1);
+        tegra_mipi_cal_write(dsi->mipi_cal, val,
+                        MIPI_CAL_MIPI_BIAS_PAD_CFG2_0);
+        tegra_mipi_cal_clk_disable(dsi->mipi_cal);
 #endif
 
         dsi->enabled = false;