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From: Douglas Anderson <dianders@chromium.org>
To: 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>,
	Sam Ravnborg <sam@ravnborg.org>
Cc: Stephen Boyd <swboyd@chromium.org>,
	linux-arm-msm@vger.kernel.org, robdclark@chromium.org,
	Douglas Anderson <dianders@chromium.org>,
	Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/3] drm/bridge: ti-sn65dsi86: Simplify refclk handling
Date: Thu,  4 Mar 2021 15:51:59 -0800	[thread overview]
Message-ID: <20210304155144.1.Ic9c04f960190faad5290738b2a35d73661862735@changeid> (raw)

The clock framework makes it simple to deal with an optional clock.
You can call clk_get_optional() and if the clock isn't specified it'll
just return NULL without complaint. It's valid to pass NULL to
enable/disable/prepare/unprepare. Let's make use of this to simplify
things a tiny bit.

NOTE: this makes things look a tad bit asymmetric now since we check
for NULL before clk_prepare_enable() but not for
clk_disable_unprepare(). This seemed OK to me. We already have to
check for NULL in the enable case anyway so why not avoid the extra
call?

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index f27306c51e4d..942019842ff4 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -1261,14 +1261,9 @@ static int ti_sn_bridge_probe(struct i2c_client *client,
 		return ret;
 	}
 
-	pdata->refclk = devm_clk_get(pdata->dev, "refclk");
-	if (IS_ERR(pdata->refclk)) {
-		ret = PTR_ERR(pdata->refclk);
-		if (ret == -EPROBE_DEFER)
-			return ret;
-		DRM_DEBUG_KMS("refclk not found\n");
-		pdata->refclk = NULL;
-	}
+	pdata->refclk = devm_clk_get_optional(pdata->dev, "refclk");
+	if (IS_ERR(pdata->refclk))
+		return PTR_ERR(pdata->refclk);
 
 	ret = ti_sn_bridge_parse_dsi_host(pdata);
 	if (ret)
-- 
2.30.1.766.gb4fecdf3b7-goog


WARNING: multiple messages have this Message-ID (diff)
From: Douglas Anderson <dianders@chromium.org>
To: 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>,
	Sam Ravnborg <sam@ravnborg.org>
Cc: robdclark@chromium.org, David Airlie <airlied@linux.ie>,
	linux-arm-msm@vger.kernel.org,
	Douglas Anderson <dianders@chromium.org>,
	dri-devel@lists.freedesktop.org,
	Stephen Boyd <swboyd@chromium.org>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 1/3] drm/bridge: ti-sn65dsi86: Simplify refclk handling
Date: Thu,  4 Mar 2021 15:51:59 -0800	[thread overview]
Message-ID: <20210304155144.1.Ic9c04f960190faad5290738b2a35d73661862735@changeid> (raw)

The clock framework makes it simple to deal with an optional clock.
You can call clk_get_optional() and if the clock isn't specified it'll
just return NULL without complaint. It's valid to pass NULL to
enable/disable/prepare/unprepare. Let's make use of this to simplify
things a tiny bit.

NOTE: this makes things look a tad bit asymmetric now since we check
for NULL before clk_prepare_enable() but not for
clk_disable_unprepare(). This seemed OK to me. We already have to
check for NULL in the enable case anyway so why not avoid the extra
call?

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index f27306c51e4d..942019842ff4 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -1261,14 +1261,9 @@ static int ti_sn_bridge_probe(struct i2c_client *client,
 		return ret;
 	}
 
-	pdata->refclk = devm_clk_get(pdata->dev, "refclk");
-	if (IS_ERR(pdata->refclk)) {
-		ret = PTR_ERR(pdata->refclk);
-		if (ret == -EPROBE_DEFER)
-			return ret;
-		DRM_DEBUG_KMS("refclk not found\n");
-		pdata->refclk = NULL;
-	}
+	pdata->refclk = devm_clk_get_optional(pdata->dev, "refclk");
+	if (IS_ERR(pdata->refclk))
+		return PTR_ERR(pdata->refclk);
 
 	ret = ti_sn_bridge_parse_dsi_host(pdata);
 	if (ret)
-- 
2.30.1.766.gb4fecdf3b7-goog

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             reply	other threads:[~2021-03-04 23:53 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-04 23:51 Douglas Anderson [this message]
2021-03-04 23:51 ` [PATCH 1/3] drm/bridge: ti-sn65dsi86: Simplify refclk handling Douglas Anderson
2021-03-04 23:52 ` [PATCH 2/3] drm/bridge: ti-sn65dsi86: Move code in prep for EDID read fix Douglas Anderson
2021-03-04 23:52   ` Douglas Anderson
2021-03-05 10:07   ` Robert Foss
2021-03-05 10:07     ` Robert Foss
2021-03-12  2:50   ` Bjorn Andersson
2021-03-12  2:50     ` Bjorn Andersson
2021-03-13 20:25   ` Stephen Boyd
2021-03-13 20:25     ` Stephen Boyd
2021-03-13 21:12   ` Laurent Pinchart
2021-03-13 21:12     ` Laurent Pinchart
2021-03-15 16:31     ` Doug Anderson
2021-03-15 16:31       ` Doug Anderson
2021-03-15 16:41       ` Laurent Pinchart
2021-03-15 16:41         ` Laurent Pinchart
2021-03-04 23:52 ` [PATCH 3/3] drm/bridge: ti-sn65dsi86: Properly get the EDID, but only if refclk Douglas Anderson
2021-03-04 23:52   ` Douglas Anderson
2021-03-12  2:59   ` Bjorn Andersson
2021-03-12  2:59     ` Bjorn Andersson
2021-03-13 21:16   ` Laurent Pinchart
2021-03-13 21:16     ` Laurent Pinchart
2021-03-15 16:25     ` Doug Anderson
2021-03-15 16:25       ` Doug Anderson
2021-03-16 21:46       ` Laurent Pinchart
2021-03-16 21:46         ` Laurent Pinchart
2021-03-17  0:44         ` Doug Anderson
2021-03-17  0:44           ` Doug Anderson
2021-03-30  2:57           ` Doug Anderson
2021-03-30  2:57             ` Doug Anderson
2021-03-30  3:19             ` Laurent Pinchart
2021-03-30  3:19               ` Laurent Pinchart
2021-03-05 10:00 ` [PATCH 1/3] drm/bridge: ti-sn65dsi86: Simplify refclk handling Robert Foss
2021-03-05 10:00   ` Robert Foss
2021-03-12  2:49 ` Bjorn Andersson
2021-03-12  2:49   ` Bjorn Andersson
2021-03-13 20:23 ` Stephen Boyd
2021-03-13 20:23   ` Stephen Boyd
2021-03-13 21:02 ` Laurent Pinchart
2021-03-13 21:02   ` Laurent Pinchart

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