[PATCH 2/4] host1x: mipi: Preserve the contents of MIPI_CAL_CTRL

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Preserve the contents of MIPI_CAL_CTRL when starting mipi
calibration.

Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
---
 drivers/gpu/host1x/mipi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/host1x/mipi.c b/drivers/gpu/host1x/mipi.c
index 4dd91fd..0af2892 100644
--- a/drivers/gpu/host1x/mipi.c
+++ b/drivers/gpu/host1x/mipi.c
@@ -215,7 +215,9 @@ int tegra_mipi_calibrate(struct tegra_mipi_device *device)
 		tegra_mipi_writel(device->mipi, value, modules[i].reg);
 	}
 
-	tegra_mipi_writel(device->mipi, MIPI_CAL_CTRL_START, MIPI_CAL_CTRL);
+	value = tegra_mipi_readl(device->mipi, MIPI_CAL_CTRL);
+	value |= MIPI_CAL_CTRL_START;
+	tegra_mipi_writel(device->mipi, value, MIPI_CAL_CTRL);
 
 	err = tegra_mipi_wait(device->mipi);
 
-- 
2.0.0

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