linux-kernel - [PATCH v3 11/15] drm/bridge: tc358767: Introduce tc_set

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Date:   Wed,  5 Jun 2019 00:05:03 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.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>,
        Chris Healy <cphealy@...il.com>,
        Cory Tusar <cory.tusar@....aero>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 11/15] drm/bridge: tc358767: Introduce tc_set_syspllparam()

Move common code converting clock rate to an appropriate constant and
configuring SYS_PLLPARAM register into a separate routine and convert
the rest of the code to use it. No functional change intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.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: Chris Healy <cphealy@...il.com>
Cc: Cory Tusar <cory.tusar@....aero>
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 | 46 +++++++++++--------------------
 1 file changed, 16 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 7b84fbb72973..c58714daa0a1 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -601,35 +601,40 @@ static int tc_stream_clock_calc(struct tc_data *tc)
 	return regmap_write(tc->regmap, DP0_VIDMNGEN1, 32768);
 }
 
-static int tc_aux_link_setup(struct tc_data *tc)
+static int tc_set_syspllparam(struct tc_data *tc)
 {
 	unsigned long rate;
-	u32 dp0_auxcfg1;
-	u32 value;
-	int ret;
+	u32 pllparam = SYSCLK_SEL_LSCLK | LSCLK_DIV_2;
 
 	rate = clk_get_rate(tc->refclk);
 	switch (rate) {
 	case 38400000:
-		value = REF_FREQ_38M4;
+		pllparam |= REF_FREQ_38M4;
 		break;
 	case 26000000:
-		value = REF_FREQ_26M;
+		pllparam |= REF_FREQ_26M;
 		break;
 	case 19200000:
-		value = REF_FREQ_19M2;
+		pllparam |= REF_FREQ_19M2;
 		break;
 	case 13000000:
-		value = REF_FREQ_13M;
+		pllparam |= REF_FREQ_13M;
 		break;
 	default:
 		dev_err(tc->dev, "Invalid refclk rate: %lu Hz\n", rate);
 		return -EINVAL;
 	}
 
+	return regmap_write(tc->regmap, SYS_PLLPARAM, pllparam);
+}
+
+static int tc_aux_link_setup(struct tc_data *tc)
+{
+	int ret;
+	u32 dp0_auxcfg1;
+
 	/* Setup DP-PHY / PLL */
-	value |= SYSCLK_SEL_LSCLK | LSCLK_DIV_2;
-	ret = regmap_write(tc->regmap, SYS_PLLPARAM, value);
+	ret = tc_set_syspllparam(tc);
 	if (ret)
 		goto err;
 
@@ -887,7 +892,6 @@ static int tc_main_link_enable(struct tc_data *tc)
 {
 	struct drm_dp_aux *aux = &tc->aux;
 	struct device *dev = tc->dev;
-	unsigned int rate;
 	u32 dp_phy_ctrl;
 	u32 value;
 	int ret;
@@ -915,25 +919,7 @@ static int tc_main_link_enable(struct tc_data *tc)
 	if (ret)
 		return ret;
 
-	rate = clk_get_rate(tc->refclk);
-	switch (rate) {
-	case 38400000:
-		value = REF_FREQ_38M4;
-		break;
-	case 26000000:
-		value = REF_FREQ_26M;
-		break;
-	case 19200000:
-		value = REF_FREQ_19M2;
-		break;
-	case 13000000:
-		value = REF_FREQ_13M;
-		break;
-	default:
-		return -EINVAL;
-	}
-	value |= SYSCLK_SEL_LSCLK | LSCLK_DIV_2;
-	ret = regmap_write(tc->regmap, SYS_PLLPARAM, value);
+	ret = tc_set_syspllparam(tc);
 	if (ret)
 		return ret;
 
-- 
2.21.0