linux-kernel - [PATCH 2/3] drm/bridge/sii8620: Fix display of packed pixel modes

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Date:   Thu, 28 Jun 2018 18:44:02 +0200
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 2/3] drm/bridge/sii8620: Fix display of packed pixel modes

Current implementation does not guarantee packed pixel modes working
with every dongle. There are some dongles, which require selecting
the output mode explicitly.

Write proper values to registers in packed_pixel mode, based on how it
is done in vendor's code. Select output color space: RGB
(no packed pixel) or YCBCR422 (packed pixel).

This reverts commit e8b92efa629dac0e70ea4145c5e70616de5f89c8
("drm/bridge/sii8620: fix display of packed pixel modes in MHL2").

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

diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
index bd30ccf..16fe7ea 100644
--- a/drivers/gpu/drm/bridge/sil-sii8620.c
+++ b/drivers/gpu/drm/bridge/sil-sii8620.c
@@ -1015,21 +1015,36 @@ 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,
 				REG_MHLTX_CTL6, 0xa0
 			);
+		}
 	}
 
+	if (ctx->use_packed_pixel)
+		out_fmt = VAL_TPI_FORMAT(YCBCR422, FULL);
+	else
+		out_fmt = VAL_TPI_FORMAT(RGB, FULL);
+
 	sii8620_write_seq(ctx,
 		REG_TPI_INPUT, VAL_TPI_FORMAT(RGB, FULL),
-		REG_TPI_OUTPUT, VAL_TPI_FORMAT(RGB, FULL),
+		REG_TPI_OUTPUT, out_fmt,
 	);
 }
 
-- 
2.7.4