drm/tegra: dsi: Set up PHY_TIMING & BTA_TIMING registers earlier

Make sure the DSI PHY_TIMING and BTA_TIMING registers are initialized
when the clocks are set up as opposed to when the output is enabled.
This makes sure that the PHY timings are properly set up when the panel
is prepared and that DCS commands sent at that time use the appropriate
timings.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index 8940360ccc9c..33f67fd601c6 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -389,6 +389,9 @@ static int tegra_dsi_set_phy_timing(struct tegra_dsi *dsi)
 		DSI_TIMING_FIELD(timing.tago, period, 1);
 	tegra_dsi_writel(dsi, value, DSI_BTA_TIMING);
 
+	if (dsi->slave)
+		return tegra_dsi_set_phy_timing(dsi->slave);
+
 	return 0;
 }
 
@@ -536,10 +539,6 @@ static int tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe,
 	value &= ~DSI_CONTROL_HOST_ENABLE;
 	tegra_dsi_writel(dsi, value, DSI_CONTROL);
 
-	err = tegra_dsi_set_phy_timing(dsi);
-	if (err < 0)
-		return err;
-
 	for (i = 0; i < NUM_PKT_SEQ; i++)
 		tegra_dsi_writel(dsi, pkt_seq[i], DSI_PKT_SEQ_0_LO + i);
 
@@ -860,6 +859,10 @@ static int tegra_output_dsi_setup_clock(struct tegra_output *output,
 	 */
 	tegra_dsi_set_timeout(dsi, bclk, vrefresh);
 
+	err = tegra_dsi_set_phy_timing(dsi);
+	if (err < 0)
+		return err;
+
 	return 0;
 }