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 f4743e8458..6408026808 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> @@ -849,6 +850,7 @@ 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); @@ -862,6 +864,13 @@ 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) @@ -900,12 +909,17 @@ 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; }