linux-kernel - [PATCH 5.1 293/405] drm: rcar-du: lvds: Set LVEN and LVRES bits together on D3

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Date:   Wed, 29 May 2019 20:04:51 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.1 293/405] drm: rcar-du: lvds: Set LVEN and LVRES bits together on D3

[ Upstream commit 00d082cc4ea6e42ec4fed832a1020231bb1ca150 ]

On the D3 SoC the LVDS PHY must be enabled in the same register write
that enables the LVDS output. Skip writing the LVEN bit independently
on that platform, it will be set by the write that sets LVRES.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Reviewed-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/rcar-du/rcar_lvds.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 7ef97b2a6edaa..f0314790333ba 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -485,9 +485,13 @@ static void rcar_lvds_enable(struct drm_bridge *bridge)
 	}
 
 	if (lvds->info->quirks & RCAR_LVDS_QUIRK_GEN3_LVEN) {
-		/* Turn on the LVDS PHY. */
+		/*
+		 * Turn on the LVDS PHY. On D3, the LVEN and LVRES bit must be
+		 * set at the same time, so don't write the register yet.
+		 */
 		lvdcr0 |= LVDCR0_LVEN;
-		rcar_lvds_write(lvds, LVDCR0, lvdcr0);
+		if (!(lvds->info->quirks & RCAR_LVDS_QUIRK_PWD))
+			rcar_lvds_write(lvds, LVDCR0, lvdcr0);
 	}
 
 	if (!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL)) {
-- 
2.20.1