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usb: ulpi: Fix compile warning in read/write on 64-bit machines.

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ulpi_read and ulpi_write are used to read/write registers via ULPI bus.
Code generates compilation warnings on 64-bit machines where pointer
is cast to u32.

This patch drops all but last 8 bits of register address.
It is possible, because addresses on ULPI bus are 6- or 8-bit.

It is not possible (according to ULPI 1.1 spec) to have more
than 8-bit addressing.

This patch should not cause regressions as all calls to
ulpi_read/write use either structure pointer (@ address 0) or integer
offsets cast to pointer - addresses requested are way below 8-bit range.

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
Acked-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Mateusz Kulikowski 2016-03-31 23:12:21 +02:00 committed by Tom Rini
parent 2cbe57cf26
commit d3d844f84a
2 changed files with 5 additions and 2 deletions
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5
drivers/usb/ulpi/ulpi-viewport.c
View file

@ -92,7 +92,8 @@ static int ulpi_request(struct ulpi_viewport *ulpi_vp, u32 value)
int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
{
u32 val = ULPI_RWRUN | ULPI_RWCTRL | ((u32)reg << 16) | (value & 0xff);
u32 addr = (uintptr_t)reg & 0xFF;
u32 val = ULPI_RWRUN | ULPI_RWCTRL | addr << 16 | (value & 0xff);
val |= (ulpi_vp->port_num & 0x7) << 24;
return ulpi_request(ulpi_vp, val);
@ -101,7 +102,7 @@ int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value)
u32 ulpi_read(struct ulpi_viewport *ulpi_vp, u8 *reg)
{
int err;
u32 val = ULPI_RWRUN | ((u32)reg << 16);
u32 val = ULPI_RWRUN | ((uintptr_t)reg & 0xFF) << 16;
val |= (ulpi_vp->port_num & 0x7) << 24;
err = ulpi_request(ulpi_vp, val);

2
include/usb/ulpi.h
View file

@ -123,6 +123,7 @@ int ulpi_reset(struct ulpi_viewport *ulpi_vp);
/*
* Write to the ULPI PHY register via the viewport.
* @reg - the ULPI register (one of the fields in struct ulpi_regs).
* Due to ULPI design, only 8 lsb of address are used.
* @value - the value - only 8 lower bits are used, others ignored.
*
* returns 0 on success, ULPI_ERROR on failure.
@ -132,6 +133,7 @@ int ulpi_write(struct ulpi_viewport *ulpi_vp, u8 *reg, u32 value);
/*
* Read the ULPI PHY register content via the viewport.
* @reg - the ULPI register (one of the fields in struct ulpi_regs).
* Due to ULPI design, only 8 lsb of address are used.
*
* returns register content on success, ULPI_ERROR on failure.
*/