[PATCH v6 15/18] video: tegra20: dsi: add reset support

Svyatoslav Ryhel
2024-01-23T17:19:57Z

Implement reset use to discard any changes which could have been
applied to DSI before and can interfere with current configuration.

Tested-by: Ion Agorria <ion@agorria.com> # HTC One X
Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # Nvidia Tegratab T114
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
drivers/video/tegra20/tegra-dsi.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/drivers/video/tegra20/tegra-dsi.c b/drivers/video/tegra20/tegra-dsi.c
index 25a629535e..fc9ca1310a 100644
--- a/drivers/video/tegra20/tegra-dsi.c
+++ b/drivers/video/tegra20/tegra-dsi.c
@@ -12,6 +12,7 @@
#include <mipi_dsi.h>
#include <backlight.h>
#include <panel.h>
+#include <reset.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/time.h>
@@ -863,6 +864,7 @@ static int tegra_dsi_bridge_probe(struct udevice *dev)
struct tegra_dsi_priv *priv = dev_get_priv(dev);
struct mipi_dsi_device *device = &priv->device;
struct mipi_dsi_panel_plat *mipi_plat;
+ struct reset_ctl reset_ctl;
int ret;

priv->version = dev_get_driver_data(dev);
@@ -876,6 +878,13 @@ static int tegra_dsi_bridge_probe(struct udevice *dev)
priv->video_fifo_depth = 480;
priv->host_fifo_depth = 64;

+ ret = reset_get_by_name(dev, "dsi", &reset_ctl);
+ if (ret) {
+ log_debug("%s: reset_get_by_name() failed: %d\n",
+ __func__, ret);
+ return ret;
+ }
+
ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
"avdd-dsi-csi-supply", &priv->avdd);
if (ret)
@@ -914,12 +923,17 @@ static int tegra_dsi_bridge_probe(struct udevice *dev)

tegra_dsi_get_format(device->format, &priv->format);

+ reset_assert(&reset_ctl);
+
ret = regulator_set_enable_if_allowed(priv->avdd, true);
if (ret && ret != -ENOSYS)
return ret;

tegra_dsi_init_clocks(dev);

+ mdelay(2);
+ reset_deassert(&reset_ctl);
+
return 0;
}

--
2.40.1