linux-kernel - [PATCH v3 14/15] drm/bridge: tc358767: Drop unnecessary 8 byte buffer

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Message-Id: <20190605070507.11417-15-andrew.smirnov@gmail.com>
Date:   Wed,  5 Jun 2019 00:05:06 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Andrey Gusakov <andrey.gusakov@...entembedded.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Cory Tusar <cory.tusar@....aero>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 14/15] drm/bridge: tc358767: Drop unnecessary 8 byte buffer

tc_get_display_props() never reads more than a byte via AUX, so
there's no need to reserve 8 for that purpose. No function change
intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Archit Taneja <architt@...eaurora.org>
Cc: Andrzej Hajda <a.hajda@...sung.com>
Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: Andrey Gusakov <andrey.gusakov@...entembedded.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Cory Tusar <cory.tusar@....aero>
Cc: Chris Healy <cphealy@...il.com>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/gpu/drm/bridge/tc358767.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 4fe7641f84ee..41a976dff13b 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -680,8 +680,7 @@ static int tc_aux_link_setup(struct tc_data *tc)
 static int tc_get_display_props(struct tc_data *tc)
 {
 	int ret;
-	/* temp buffer */
-	u8 tmp[8];
+	u8 reg;
 
 	/* Read DP Rx Link Capability */
 	ret = drm_dp_link_probe(&tc->aux, &tc->link.base);
@@ -697,21 +696,21 @@ static int tc_get_display_props(struct tc_data *tc)
 		tc->link.base.num_lanes = 2;
 	}
 
-	ret = drm_dp_dpcd_readb(&tc->aux, DP_MAX_DOWNSPREAD, tmp);
+	ret = drm_dp_dpcd_readb(&tc->aux, DP_MAX_DOWNSPREAD, &reg);
 	if (ret < 0)
 		goto err_dpcd_read;
-	tc->link.spread = tmp[0] & DP_MAX_DOWNSPREAD_0_5;
+	tc->link.spread = reg & DP_MAX_DOWNSPREAD_0_5;
 
-	ret = drm_dp_dpcd_readb(&tc->aux, DP_MAIN_LINK_CHANNEL_CODING, tmp);
+	ret = drm_dp_dpcd_readb(&tc->aux, DP_MAIN_LINK_CHANNEL_CODING, &reg);
 	if (ret < 0)
 		goto err_dpcd_read;
 
 	tc->link.scrambler_dis = false;
 	/* read assr */
-	ret = drm_dp_dpcd_readb(&tc->aux, DP_EDP_CONFIGURATION_SET, tmp);
+	ret = drm_dp_dpcd_readb(&tc->aux, DP_EDP_CONFIGURATION_SET, &reg);
 	if (ret < 0)
 		goto err_dpcd_read;
-	tc->link.assr = tmp[0] & DP_ALTERNATE_SCRAMBLER_RESET_ENABLE;
+	tc->link.assr = reg & DP_ALTERNATE_SCRAMBLER_RESET_ENABLE;
 
 	dev_dbg(tc->dev, "DPCD rev: %d.%d, rate: %s, lanes: %d, framing: %s\n",
 		tc->link.base.revision >> 4, tc->link.base.revision & 0x0f,
-- 
2.21.0