linux-kernel - [PATCH 4.14 29/62] drm/bridge: tc358767: fix initial DP0/1

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Message-Id: <20190218133508.457746998@linuxfoundation.org>
Date:   Mon, 18 Feb 2019 14:43:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tomi Valkeinen <tomi.valkeinen@...com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 29/62] drm/bridge: tc358767: fix initial DP0/1_SRCCTRL value

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 9a63bd6fe1b5590ffa42ae2ed22ee21363293e31 ]

Initially DP0_SRCCTRL is set to a static value which includes
DP0_SRCCTRL_LANES_2 and DP0_SRCCTRL_BW27, even when only 1 lane of
1.62Gbps speed is used. DP1_SRCCTRL is configured to a magic number.

This patch changes the configuration as follows:

Configure DP0_SRCCTRL by using tc_srcctrl() which provides the correct
value.

DP1_SRCCTRL needs two bits to be set to the same value as DP0_SRCCTRL:
SSCG and BW27. All other bits can be zero.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190103115954.12785-5-tomi.valkeinen@ti.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/tc358767.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index acac2c1769ad..24bb6bfa36f3 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -834,12 +834,11 @@ static int tc_main_link_setup(struct tc_data *tc)
 	if (!tc->mode)
 		return -EINVAL;
 
-	/* from excel file - DP0_SrcCtrl */
-	tc_write(DP0_SRCCTRL, DP0_SRCCTRL_SCRMBLDIS | DP0_SRCCTRL_EN810B |
-		 DP0_SRCCTRL_LANESKEW | DP0_SRCCTRL_LANES_2 |
-		 DP0_SRCCTRL_BW27 | DP0_SRCCTRL_AUTOCORRECT);
-	/* from excel file - DP1_SrcCtrl */
-	tc_write(DP1_SRCCTRL, 0x00003083);
+	tc_write(DP0_SRCCTRL, tc_srcctrl(tc));
+	/* SSCG and BW27 on DP1 must be set to the same as on DP0 */
+	tc_write(DP1_SRCCTRL,
+		 (tc->link.spread ? DP0_SRCCTRL_SSCG : 0) |
+		 ((tc->link.base.rate != 162000) ? DP0_SRCCTRL_BW27 : 0));
 
 	rate = clk_get_rate(tc->refclk);
 	switch (rate) {
-- 
2.19.1