[PATCH 5.4 144/320] phy: uniphier-usb3ss: fix unintended writing zeros to PHY register

Greg Kroah-Hartman
2022-01-24T19:33:41Z

From: Ryuta NAKANISHI <nakanishi.ryuta@socionext.com>

[ Upstream commit 898c7a9ec81620125f2463714a0f4dea18ad6e54 ]

Similar to commit 4a90bbb478db ("phy: uniphier-pcie: Fix updating phy
parameters"), in function uniphier_u3ssphy_set_param(), unintentionally
write zeros to other fields when writing PHY registers.

Fixes: 5ab43d0f8697 ("phy: socionext: add USB3 PHY driver for UniPhier SoC")
Signed-off-by: Ryuta NAKANISHI <nakanishi.ryuta@socionext.com>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/1640150369-4134-1-git-send-email-hayashi.kunihiko@socionext.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/phy/socionext/phy-uniphier-usb3ss.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/socionext/phy-uniphier-usb3ss.c b/drivers/phy/socionext/phy-uniphier-usb3ss.c
index a7577e316baf5..e63648b5c7547 100644
--- a/drivers/phy/socionext/phy-uniphier-usb3ss.c
+++ b/drivers/phy/socionext/phy-uniphier-usb3ss.c
@@ -22,11 +22,13 @@
#include <linux/reset.h>

#define SSPHY_TESTI 0x0
-#define SSPHY_TESTO 0x4
#define TESTI_DAT_MASK GENMASK(13, 6)
#define TESTI_ADR_MASK GENMASK(5, 1)
#define TESTI_WR_EN BIT(0)

+#define SSPHY_TESTO 0x4
+#define TESTO_DAT_MASK GENMASK(7, 0)
+
#define PHY_F(regno, msb, lsb) { (regno), (msb), (lsb) }

#define CDR_CPD_TRIM PHY_F(7, 3, 0) /* RxPLL charge pump current */
@@ -84,12 +86,12 @@ static void uniphier_u3ssphy_set_param(struct uniphier_u3ssphy_priv *priv,
val = FIELD_PREP(TESTI_DAT_MASK, 1);
val |= FIELD_PREP(TESTI_ADR_MASK, p->field.reg_no);
uniphier_u3ssphy_testio_write(priv, val);
- val = readl(priv->base + SSPHY_TESTO);
+ val = readl(priv->base + SSPHY_TESTO) & TESTO_DAT_MASK;

/* update value */
- val &= ~FIELD_PREP(TESTI_DAT_MASK, field_mask);
+ val &= ~field_mask;
data = field_mask & (p->value << p->field.lsb);
- val = FIELD_PREP(TESTI_DAT_MASK, data);
+ val = FIELD_PREP(TESTI_DAT_MASK, data | val);
val |= FIELD_PREP(TESTI_ADR_MASK, p->field.reg_no);
uniphier_u3ssphy_testio_write(priv, val);
uniphier_u3ssphy_testio_write(priv, val | TESTI_WR_EN);
--
2.34.1