[PATCH 1/1] usb: gadget: tegra-xudc: Do not program SPARAM

From: Wayne Chang <waynec@nvidia.com>
To: <balbi@kernel.org>, <gregkh@linuxfoundation.org>,
	<thierry.reding@gmail.com>, <jonathanh@nvidia.com>
Cc: <zhangqilong3@huawei.com>, <yangyingliang@huawei.com>,
	<rikard.falkeborn@gmail.com>, <chunfeng.yun@mediatek.com>,
	<waynec@nvidia.com>, <linux-usb@vger.kernel.org>,
	<linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH 1/1] usb: gadget: tegra-xudc: Do not program SPARAM
Date: Fri, 7 Jan 2022 17:04:43 +0800	[thread overview]
Message-ID: <20220107090443.149021-1-waynec@nvidia.com> (raw)

According to the Tegra Technical Reference Manual, SPARAM
is a read-only register and should not be programmed in
the driver.

The change removes the wrong SPARAM usage.

Signed-off-by: Wayne Chang <waynec@nvidia.com>
---
 drivers/usb/gadget/udc/tegra-xudc.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
index 43f1b0d461c1..716d9ab2d2ff 100644
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -32,9 +32,6 @@
 #include <linux/workqueue.h>
 
 /* XUSB_DEV registers */
-#define SPARAM 0x000
-#define  SPARAM_ERSTMAX_MASK GENMASK(20, 16)
-#define  SPARAM_ERSTMAX(x) (((x) << 16) & SPARAM_ERSTMAX_MASK)
 #define DB 0x004
 #define  DB_TARGET_MASK GENMASK(15, 8)
 #define  DB_TARGET(x) (((x) << 8) & DB_TARGET_MASK)
@@ -3295,11 +3292,6 @@ static void tegra_xudc_init_event_ring(struct tegra_xudc *xudc)
 	unsigned int i;
 	u32 val;
 
-	val = xudc_readl(xudc, SPARAM);
-	val &= ~(SPARAM_ERSTMAX_MASK);
-	val |= SPARAM_ERSTMAX(XUDC_NR_EVENT_RINGS);
-	xudc_writel(xudc, val, SPARAM);
-
 	for (i = 0; i < ARRAY_SIZE(xudc->event_ring); i++) {
 		memset(xudc->event_ring[i], 0, XUDC_EVENT_RING_SIZE *
 		       sizeof(*xudc->event_ring[i]));
-- 
2.25.1

