linux-kernel - [PATCH 8/9] drm/bridge: tc358767: Introduce tc_pllupdate

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Message-Id: <20190226193609.9862-9-andrew.smirnov@gmail.com>
Date:   Tue, 26 Feb 2019 11:36:08 -0800
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>,
        Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 8/9] drm/bridge: tc358767: Introduce tc_pllupdate_pllen()

Tc_wait_pll_lock() is always called as a follow-up for updating
PLLUPDATE and PLLEN bit of a given PLL control register. To simplify
things, merge the two operation into a single helper function
tc_pllupdate_pllen() and convert the rest of the code to use it. No
functional 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: 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 | 36 +++++++++++++++++++------------
 1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 227f14cd2d3d..239b3aaa255d 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -390,10 +390,18 @@ static u32 tc_srcctrl(struct tc_data *tc)
 	return reg;
 }
 
-static void tc_wait_pll_lock(struct tc_data *tc)
+static int tc_pllupdate_pllen(struct tc_data *tc, unsigned int pllctrl)
 {
+	int ret;
+
+	ret = regmap_write(tc->regmap, pllctrl, PLLUPDATE | PLLEN);
+	if (ret)
+		return ret;
+
 	/* Wait for PLL to lock: up to 2.09 ms, depending on refclk */
 	usleep_range(3000, 6000);
+
+	return 0;
 }
 
 static int tc_pxl_pll_en(struct tc_data *tc, u32 refclk, u32 pixelclock)
@@ -487,11 +495,7 @@ static int tc_pxl_pll_en(struct tc_data *tc, u32 refclk, u32 pixelclock)
 		 (best_mul << 0));		/* Multiplier for PLL */
 
 	/* Force PLL parameter update and disable bypass */
-	tc_write(PXL_PLLCTRL, PLLUPDATE | PLLEN);
-
-	tc_wait_pll_lock(tc);
-
-	return 0;
+	return tc_pllupdate_pllen(tc, PXL_PLLCTRL);
 err:
 	return ret;
 }
@@ -568,11 +572,13 @@ static int tc_aux_link_setup(struct tc_data *tc)
 	 * Initially PLLs are in bypass. Force PLL parameter update,
 	 * disable PLL bypass, enable PLL
 	 */
-	tc_write(DP0_PLLCTRL, PLLUPDATE | PLLEN);
-	tc_wait_pll_lock(tc);
+	ret = tc_pllupdate_pllen(tc, DP0_PLLCTRL);
+	if (ret)
+		return ret;
 
-	tc_write(DP1_PLLCTRL, PLLUPDATE | PLLEN);
-	tc_wait_pll_lock(tc);
+	ret = tc_pllupdate_pllen(tc, DP1_PLLCTRL);
+	if (ret)
+		return ret;
 
 	ret = tc_poll_timeout(tc->regmap, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 1,
 			      1000);
@@ -846,11 +852,13 @@ static int tc_main_link_setup(struct tc_data *tc)
 	msleep(100);
 
 	/* PLL setup */
-	tc_write(DP0_PLLCTRL, PLLUPDATE | PLLEN);
-	tc_wait_pll_lock(tc);
+	ret = tc_pllupdate_pllen(tc, DP0_PLLCTRL);
+	if (ret)
+		return ret;
 
-	tc_write(DP1_PLLCTRL, PLLUPDATE | PLLEN);
-	tc_wait_pll_lock(tc);
+	ret = tc_pllupdate_pllen(tc, DP1_PLLCTRL);
+	if (ret)
+		return ret;
 
 	/* PXL PLL setup */
 	if (tc_test_pattern) {
-- 
2.20.1