linux-kernel - [PATCH v2 5/7] phy: uniphier-usb3hs: Change Rx sync mode to avoid communication failure

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Date:   Thu, 30 Jan 2020 15:52:43 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
Subject: [PATCH v2 5/7] phy: uniphier-usb3hs: Change Rx sync mode to avoid communication failure

In case of using default parameters, communication failure might occur
in rare cases. This sets Rx sync mode parameter to avoid the issue.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
---
 drivers/phy/socionext/phy-uniphier-usb3hs.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/socionext/phy-uniphier-usb3hs.c b/drivers/phy/socionext/phy-uniphier-usb3hs.c
index bdf696e..a9bc741 100644
--- a/drivers/phy/socionext/phy-uniphier-usb3hs.c
+++ b/drivers/phy/socionext/phy-uniphier-usb3hs.c
@@ -41,10 +41,12 @@
 
 #define PHY_F(regno, msb, lsb) { (regno), (msb), (lsb) }
 
+#define RX_CHK_SYNC	PHY_F(0, 5, 5)	/* RX sync mode */
+#define RX_SYNC_SEL	PHY_F(1, 1, 0)	/* RX sync length */
 #define LS_SLEW		PHY_F(10, 6, 6)	/* LS mode slew rate */
 #define FS_LS_DRV	PHY_F(10, 5, 5)	/* FS/LS slew rate */
 
-#define MAX_PHY_PARAMS	2
+#define MAX_PHY_PARAMS	4
 
 struct uniphier_u3hsphy_param {
 	struct {
@@ -395,13 +397,19 @@ static const struct uniphier_u3hsphy_soc_data uniphier_pro5_data = {
 
 static const struct uniphier_u3hsphy_soc_data uniphier_pxs2_data = {
 	.is_legacy = false,
-	.nparams = 0,
+	.nparams = 2,
+	.param = {
+		{ RX_CHK_SYNC, 1 },
+		{ RX_SYNC_SEL, 1 },
+	},
 };
 
 static const struct uniphier_u3hsphy_soc_data uniphier_ld20_data = {
 	.is_legacy = false,
-	.nparams = 2,
+	.nparams = 4,
 	.param = {
+		{ RX_CHK_SYNC, 1 },
+		{ RX_SYNC_SEL, 1 },
 		{ LS_SLEW, 1 },
 		{ FS_LS_DRV, 1 },
 	},
@@ -412,7 +420,11 @@ static const struct uniphier_u3hsphy_soc_data uniphier_ld20_data = {
 
 static const struct uniphier_u3hsphy_soc_data uniphier_pxs3_data = {
 	.is_legacy = false,
-	.nparams = 0,
+	.nparams = 2,
+	.param = {
+		{ RX_CHK_SYNC, 1 },
+		{ RX_SYNC_SEL, 1 },
+	},
 	.trim_func = uniphier_u3hsphy_trim_ld20,
 	.config0 = 0x92316680,
 	.config1 = 0x00000106,
-- 
2.7.4