Implement reset use to discard any changes which could have been applied to DC before and can interfere with current configuration.
Tested-by: Agneli poczt@protonmail.ch # Toshiba AC100 T20 Tested-by: Robert Eckelmann longnoserob@gmail.com # ASUS TF101 Tested-by: Andreas Westman Dorcsak hedmoo@yahoo.com # ASUS Grouper E1565 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-dc.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/drivers/video/tegra20/tegra-dc.c b/drivers/video/tegra20/tegra-dc.c index 56a23b3c97..35abb6fe46 100644 --- a/drivers/video/tegra20/tegra-dc.c +++ b/drivers/video/tegra20/tegra-dc.c @@ -10,7 +10,9 @@ #include <panel.h> #include <part.h> #include <pwm.h> +#include <reset.h> #include <video.h> +#include <linux/delay.h> #include <asm/cache.h> #include <asm/global_data.h> #include <asm/system.h> @@ -342,6 +344,7 @@ static int tegra_lcd_probe(struct udevice *dev) struct video_uc_plat *plat = dev_get_uclass_plat(dev); struct video_priv *uc_priv = dev_get_uclass_priv(dev); struct tegra_lcd_priv *priv = dev_get_priv(dev); + struct reset_ctl reset_ctl; int ret;
/* Initialize the Tegra display controller */ @@ -349,6 +352,20 @@ static int tegra_lcd_probe(struct udevice *dev) funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT); #endif
+ ret = reset_get_by_name(dev, "dc", &reset_ctl); + if (ret) { + log_err("reset_get_by_name() failed: %d\n", ret); + return ret; + } + + clock_disable(priv->dc_clk[0]); + + /* Reset everything set before */ + reset_assert(&reset_ctl); + mdelay(4); + reset_deassert(&reset_ctl); + mdelay(4); + if (tegra_display_probe(priv, (void *)plat->base)) { debug("%s: Failed to probe display driver\n", __func__); return -1;