linux-kernel - [PATCH] drm/bridge/sii8620: fix display of packed pixel modes in MHL2

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Date:   Tue, 23 Jan 2018 12:17:19 +0100
From:   Maciej Purski <m.purski@...sung.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel@...r.kernel.org, Maciej Purski <m.purski@...sung.com>
Subject: [PATCH] drm/bridge/sii8620: fix display of packed pixel modes in
 MHL2

Currently packed pixel modes in MHL2 can't be displayed. The device
automatically recognizes output format, so setting format other than
RGB causes failure. Fix it by writing proper values to registers.

Tested on MHL1 and MHL2 using various vendors' dongles both in
DVI and HDMI mode.

Signed-off-by: Maciej Purski <m.purski@...sung.com>
---
 drivers/gpu/drm/bridge/sil-sii8620.c | 17 +----------------
 1 file changed, 1 insertion(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
index 1718c2e..e13708d 100644
--- a/drivers/gpu/drm/bridge/sil-sii8620.c
+++ b/drivers/gpu/drm/bridge/sil-sii8620.c
@@ -1005,20 +1005,11 @@ static void sii8620_stop_video(struct sii8620 *ctx)
 
 static void sii8620_set_format(struct sii8620 *ctx)
 {
-	u8 out_fmt;
-
 	if (sii8620_is_mhl3(ctx)) {
 		sii8620_setbits(ctx, REG_M3_P0CTRL,
 				BIT_M3_P0CTRL_MHL3_P0_PIXEL_MODE_PACKED,
 				ctx->use_packed_pixel ? ~0 : 0);
 	} else {
-		if (ctx->use_packed_pixel)
-			sii8620_write_seq_static(ctx,
-				REG_VID_MODE, BIT_VID_MODE_M1080P,
-				REG_MHL_TOP_CTL, BIT_MHL_TOP_CTL_MHL_PP_SEL | 1,
-				REG_MHLTX_CTL6, 0x60
-			);
-		else
 			sii8620_write_seq_static(ctx,
 				REG_VID_MODE, 0,
 				REG_MHL_TOP_CTL, 1,
@@ -1026,15 +1017,9 @@ static void sii8620_set_format(struct sii8620 *ctx)
 			);
 	}
 
-	if (ctx->use_packed_pixel)
-		out_fmt = VAL_TPI_FORMAT(YCBCR422, FULL) |
-			BIT_TPI_OUTPUT_CSCMODE709;
-	else
-		out_fmt = VAL_TPI_FORMAT(RGB, FULL);
-
 	sii8620_write_seq(ctx,
 		REG_TPI_INPUT, VAL_TPI_FORMAT(RGB, FULL),
-		REG_TPI_OUTPUT, out_fmt,
+		REG_TPI_OUTPUT, VAL_TPI_FORMAT(RGB, FULL),
 	);
 }
 
-- 
2.7.4