Commit b22fd0b9 authored by Diogo Ivo's avatar Diogo Ivo Committed by Thierry Reding
Browse files

drm/tegra: dsi: Clear enable register if powered by bootloader 



In cases where the DSI module is left on by the bootloader
some panels may fail to initialize if the enable register is not cleared
before the panel's initialization sequence is sent, so clear it if that
is the case.

Signed-off-by: default avatarDiogo Ivo <diogo.ivo@tecnico.ulisboa.pt>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent e752eef0

drivers/gpu/drm/tegra/dsi.c

+9 −0
Original line number Diff line number Diff line
@@ -912,6 +912,15 @@ static void tegra_dsi_encoder_enable(struct drm_encoder *encoder) 
	u32 value;

	int err;



	/* If the bootloader enabled DSI it needs to be disabled

	 * in order for the panel initialization commands to be

	 * properly sent.

	 */

	value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);



	if (value & DSI_POWER_CONTROL_ENABLE)

		tegra_dsi_disable(dsi);



	err = tegra_dsi_prepare(dsi);

	if (err < 0) {

		dev_err(dsi->dev, "failed to prepare: %d\n", err);