By paving the CTRL reg value, the current code changes
MIPI_CAL_PRESCALE ("Auto-cal calibration step prescale")
from 1us to 0.1us (val=0). In the description for phy's noise
filter (MIPI_CAL_NOISE_FLT), the TRM states that if the value
of the prescale is 0 (or 0.1us), the filter should be set
between 2-5. However, the current code sets it to 0.
For now, let's keep the prescale and filter values as-is, which
is most likely the power-on-reset values of 0x2 and 0xa, respectively.
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
---
Changes in v2:
- Improved the commit description
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 9882ea1..0f3b77e 100644
--- a/drivers/gpu/host1x/mipi.c
+++ b/drivers/gpu/host1x/mipi.c
@@ -208,7 +208,9 @@ 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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