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- From 367747c7813cecf19b46ef7134691f903ab76dc9 Mon Sep 17 00:00:00 2001
- From: Fabian Vogt <[email protected]>
- Date: Mon, 23 Jan 2023 08:35:08 +0100
- Subject: [PATCH 23/29] fotg210-udc: Improve device initialization
- Reset the device explicitly to get into a known state and also set the chip
- enable bit. Additionally, mask interrupts which aren't handled.
- Signed-off-by: Fabian Vogt <[email protected]>
- Signed-off-by: Linus Walleij <[email protected]>
- Link: https://lore.kernel.org/r/[email protected]
- Signed-off-by: Greg Kroah-Hartman <[email protected]>
- ---
- --- a/drivers/usb/fotg210/fotg210-udc.c
- +++ b/drivers/usb/fotg210/fotg210-udc.c
- @@ -7,6 +7,7 @@
- * Author : Yuan-Hsin Chen <[email protected]>
- */
-
- +#include <linux/delay.h>
- #include <linux/dma-mapping.h>
- #include <linux/err.h>
- #include <linux/interrupt.h>
- @@ -1022,6 +1023,11 @@ static int fotg210_udc_start(struct usb_
- dev_err(fotg210->dev, "can't bind to phy\n");
- }
-
- + /* chip enable */
- + value = ioread32(fotg210->reg + FOTG210_DMCR);
- + value |= DMCR_CHIP_EN;
- + iowrite32(value, fotg210->reg + FOTG210_DMCR);
- +
- /* enable device global interrupt */
- value = ioread32(fotg210->reg + FOTG210_DMCR);
- value |= DMCR_GLINT_EN;
- @@ -1038,6 +1044,15 @@ static void fotg210_init(struct fotg210_
- iowrite32(GMIR_MHC_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY,
- fotg210->reg + FOTG210_GMIR);
-
- + /* mask interrupts for groups other than 0-2 */
- + iowrite32(~(DMIGR_MINT_G0 | DMIGR_MINT_G1 | DMIGR_MINT_G2),
- + fotg210->reg + FOTG210_DMIGR);
- +
- + /* udc software reset */
- + iowrite32(DMCR_SFRST, fotg210->reg + FOTG210_DMCR);
- + /* Better wait a bit, but without a datasheet, no idea how long. */
- + usleep_range(100, 200);
- +
- /* disable device global interrupt */
- value = ioread32(fotg210->reg + FOTG210_DMCR);
- value &= ~DMCR_GLINT_EN;
- --- a/drivers/usb/fotg210/fotg210-udc.h
- +++ b/drivers/usb/fotg210/fotg210-udc.h
- @@ -58,6 +58,8 @@
-
- /* Device Mask of Interrupt Group Register (0x130) */
- #define FOTG210_DMIGR 0x130
- +#define DMIGR_MINT_G2 (1 << 2)
- +#define DMIGR_MINT_G1 (1 << 1)
- #define DMIGR_MINT_G0 (1 << 0)
-
- /* Device Mask of Interrupt Source Group 0(0x134) */
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