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From: Torsten Duwe <duwe@lst.de>
To: Thierry Reding <thierry.reding@gmail.com>,
	Daniel Vetter <daniel@ffwll.ch>
Cc: Andrzej Hajda <a.hajda@samsung.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Jonas Karlman <jonas@kwiboo.se>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Maxime Ripard <maxime@cerno.tech>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [RESEND][PATCH] drm/bridge: analogix-anx78xx: Fix drm_dp_link helper removal
Date: Tue, 18 Feb 2020 16:57:44 +0100 (CET)	[thread overview]
Message-ID: <20200218155744.9675368BE1@verein.lst.de> (raw)

drm_dp_link_rate_to_bw_code and ...bw_code_to_link_rate simply divide by
and multiply with 27000, respectively. Avoid an overflow in the u8 dpcd[0]
and the multiply+divide alltogether.

fixes: ff1e8fb68ea06027 ("analogix-anx78xx: Avoid drm_dp_link helpers")
Signed-off-by: Torsten Duwe <duwe@suse.de>
Reviewed-by: Thierry Reding <treding@nvidia.com>
---
https://patchwork.freedesktop.org/patch/343003/ (dropped the review mark)
https://lists.freedesktop.org/archives/dri-devel/2020-January/253535.html

---
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
index 41867be03751..864423f59d66 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
@@ -722,10 +722,9 @@ static int anx78xx_dp_link_training(struct anx78xx *anx78xx)
 	if (err)
 		return err;
 
-	dpcd[0] = drm_dp_max_link_rate(anx78xx->dpcd);
-	dpcd[0] = drm_dp_link_rate_to_bw_code(dpcd[0]);
 	err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
-			   SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]);
+			   SP_DP_MAIN_LINK_BW_SET_REG,
+			   anx78xx->dpcd[DP_MAX_LINK_RATE]);
 	if (err)
 		return err;
 

WARNING: multiple messages have this Message-ID (diff)
From: Torsten Duwe <duwe@lst.de>
To: Thierry Reding <thierry.reding@gmail.com>,
	Daniel Vetter <daniel@ffwll.ch>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>,
	Jonas Karlman <jonas@kwiboo.se>, David Airlie <airlied@linux.ie>,
	Neil Armstrong <narmstrong@baylibre.com>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	Andrzej Hajda <a.hajda@samsung.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Maxime Ripard <maxime@cerno.tech>
Subject: [RESEND][PATCH] drm/bridge: analogix-anx78xx: Fix drm_dp_link helper removal
Date: Tue, 18 Feb 2020 16:57:44 +0100 (CET)	[thread overview]
Message-ID: <20200218155744.9675368BE1@verein.lst.de> (raw)

drm_dp_link_rate_to_bw_code and ...bw_code_to_link_rate simply divide by
and multiply with 27000, respectively. Avoid an overflow in the u8 dpcd[0]
and the multiply+divide alltogether.

fixes: ff1e8fb68ea06027 ("analogix-anx78xx: Avoid drm_dp_link helpers")
Signed-off-by: Torsten Duwe <duwe@suse.de>
Reviewed-by: Thierry Reding <treding@nvidia.com>
---
https://patchwork.freedesktop.org/patch/343003/ (dropped the review mark)
https://lists.freedesktop.org/archives/dri-devel/2020-January/253535.html

---
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
index 41867be03751..864423f59d66 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
@@ -722,10 +722,9 @@ static int anx78xx_dp_link_training(struct anx78xx *anx78xx)
 	if (err)
 		return err;
 
-	dpcd[0] = drm_dp_max_link_rate(anx78xx->dpcd);
-	dpcd[0] = drm_dp_link_rate_to_bw_code(dpcd[0]);
 	err = regmap_write(anx78xx->map[I2C_IDX_TX_P0],
-			   SP_DP_MAIN_LINK_BW_SET_REG, dpcd[0]);
+			   SP_DP_MAIN_LINK_BW_SET_REG,
+			   anx78xx->dpcd[DP_MAX_LINK_RATE]);
 	if (err)
 		return err;
 
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             reply	other threads:[~2020-02-18 15:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-18 15:57 Torsten Duwe [this message]
2020-02-18 15:57 ` [RESEND][PATCH] drm/bridge: analogix-anx78xx: Fix drm_dp_link helper removal Torsten Duwe
2020-02-18 19:12 ` Daniel Vetter
2020-02-18 19:12   ` Daniel Vetter
  -- strict thread matches above, loose matches on Subject: below --
2020-02-18 15:47 Torsten Duwe
2020-02-18 15:47 ` Torsten Duwe

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