From 93ae2b9f6c792d17b691e23e4ba3cf07867e1df1 Mon Sep 17 00:00:00 2001
From: Jack Andersen <jackoalan@gmail.com>
Date: Fri, 26 May 2023 12:19:19 -0700
Subject: [PATCH 0474/1085] panel-sitronix-st7701: Fix panel prepare over SPI

A DSI write is issued in st7701_prepare even when the probed panel
runs on SPI. In practice, this results in a panic with the
vc4-kms-dpi-hyperpixel2r overlay active.

Perform the equivalent write over SPI in this case.

Signed-off-by: Jack Andersen <jackoalan@gmail.com>
---
 drivers/gpu/drm/panel/panel-sitronix-st7701.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/panel/panel-sitronix-st7701.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
@@ -605,7 +605,15 @@ static int st7701_prepare(struct drm_pan
 		st7701->desc->gip_sequence(st7701);
 
 	/* Disable Command2 */
-	st7701_switch_cmd_bkx(st7701, false, 0);
+	switch (st7701->desc->interface) {
+	case ST7701_CTRL_DSI:
+		st7701_switch_cmd_bkx(st7701, false, 0);
+		break;
+	case ST7701_CTRL_SPI:
+		ST7701_SPI(st7701, DSI_CMD2BKX_SEL,
+			   0x177, 0x101, 0x100, 0x100, SPI_CMD2BKX_SEL_NONE);
+		break;
+	}
 
 	return 0;
 }
