drm: bridge: samsung-dsim: Drain command transfer FIFO before transfer

[ Upstream commit 14806c6 ]

Wait until the command transfer FIFO is empty before loading in the next
command. The previous behavior where the code waited until command transfer
FIFO was not full suffered from transfer corruption, where the last command
in the FIFO could be overwritten in case the FIFO indicates not full, but
also does not have enough space to store another transfer yet.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> # imx8mm-icore
Link: https://patchwork.freedesktop.org/patch/msgid/20230615201511.565923-1-marex@denx.de
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/gpu/drm/bridge/samsung-dsim.c

@@ -1009,7 +1009,7 @@ static int samsung_dsim_wait_for_hdr_fifo(struct samsung_dsim *dsi)
 	do {
 		u32 reg = samsung_dsim_read(dsi, DSIM_FIFOCTRL_REG);
 
-		if (!(reg & DSIM_SFR_HEADER_FULL))
+		if (reg & DSIM_SFR_HEADER_EMPTY)
 			return 0;
 
 		if (!cond_resched())