diff mbox series

[v4,3/5] drm: rcar-du: dsi: Improve DSI shutdown

Message ID 20220824124726.187224-4-tomi.valkeinen@ideasonboard.com (mailing list archive)
State New, archived
Headers show
Series drm: rcar-du: DSI fixes | expand

Commit Message

Tomi Valkeinen Aug. 24, 2022, 12:47 p.m. UTC 
From: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>

Improve the DSI shutdown procedure by clearing various bits that were
set while enabling the DSI output. There has been no clear issues caused
by these, but it's safer to ensure that the features are disabled at the
start of the next DSI enable.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
index 7f2be490fcf8..9c79fe2fc70b 100644
--- a/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
+++ b/drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c
@@ -441,9 +441,21 @@  static int rcar_mipi_dsi_startup(struct rcar_mipi_dsi *dsi,
 
 static void rcar_mipi_dsi_shutdown(struct rcar_mipi_dsi *dsi)
 {
+	/* Disable VCLKEN */
+	rcar_mipi_dsi_write(dsi, VCLKSET, 0);
+
+	/* Disable DOT clock */
+	rcar_mipi_dsi_write(dsi, VCLKSET, 0);
+
 	rcar_mipi_dsi_clr(dsi, PHYSETUP, PHYSETUP_RSTZ);
 	rcar_mipi_dsi_clr(dsi, PHYSETUP, PHYSETUP_SHUTDOWNZ);
 
+	/* CFGCLK disable */
+	rcar_mipi_dsi_clr(dsi, CFGCLKSET, CFGCLKSET_CKEN);
+
+	/* LPCLK disable */
+	rcar_mipi_dsi_clr(dsi, LPCLKSET, LPCLKSET_CKEN);
+
 	dev_dbg(dsi->dev, "DSI device is shutdown\n");
 }