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usb: r8a66597-udc buffer management update 

This patch updates the r8a66597-udc buffer management code.

Use fixed buffers for bulk and isochronous pipes, also make
sure to handle the isochronous-as-bulk case. With fixed buffers
there is no need to keep track of used buffers with bi_bufnum.

Also, this fixes a potential buffer offset problem where the
base offset incorrectly varies with the number of pipes used.

The m66592 driver recently got fixed in a similar way.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2009-08-19 14:19:08 +00:00 committed by Paul Mundt
parent d2e27bdf28
commit ef5ce3b690
2 changed files with 11 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/usb/gadget/r8a66597-udc.c
View File

@ -252,24 +252,27 @@ static int pipe_buffer_setting(struct r8a66597 *r8a66597,
buf_bsize = 0;
break;
case R8A66597_BULK:
bufnum = r8a66597->bi_bufnum +
(info->pipe - R8A66597_BASE_PIPENUM_BULK) * 16;
r8a66597->bi_bufnum += 16;
/* isochronous pipes may be used as bulk pipes */
if (info->pipe > R8A66597_BASE_PIPENUM_BULK)
bufnum = info->pipe - R8A66597_BASE_PIPENUM_BULK;
else
bufnum = info->pipe - R8A66597_BASE_PIPENUM_ISOC;
bufnum = R8A66597_BASE_BUFNUM + (bufnum * 16);
buf_bsize = 7;
pipecfg |= R8A66597_DBLB;
if (!info->dir_in)
pipecfg |= R8A66597_SHTNAK;
break;
case R8A66597_ISO:
bufnum = r8a66597->bi_bufnum +
bufnum = R8A66597_BASE_BUFNUM +
(info->pipe - R8A66597_BASE_PIPENUM_ISOC) * 16;
r8a66597->bi_bufnum += 16;
buf_bsize = 7;
break;
}
if (r8a66597->bi_bufnum > R8A66597_MAX_BUFNUM) {
printk(KERN_ERR "r8a66597 pipe memory is insufficient(%d)\n",
r8a66597->bi_bufnum);
if (buf_bsize && ((bufnum + 16) >= R8A66597_MAX_BUFNUM)) {
pr_err(KERN_ERR "r8a66597 pipe memory is insufficient\n");
return -ENOMEM;
}
@ -289,17 +292,6 @@ static void pipe_buffer_release(struct r8a66597 *r8a66597,
if (info->pipe == 0)
return;
switch (info->type) {
case R8A66597_BULK:
if (is_bulk_pipe(info->pipe))
r8a66597->bi_bufnum -= 16;
break;
case R8A66597_ISO:
if (is_isoc_pipe(info->pipe))
r8a66597->bi_bufnum -= 16;
break;
}
if (is_bulk_pipe(info->pipe))
r8a66597->bulk--;
else if (is_interrupt_pipe(info->pipe))
@ -1553,8 +1545,6 @@ static int __init r8a66597_probe(struct platform_device *pdev)
r8a66597->timer.data = (unsigned long)r8a66597;
r8a66597->reg = (unsigned long)reg;
r8a66597->bi_bufnum = R8A66597_BASE_BUFNUM;
#ifdef CONFIG_HAVE_CLK
if (r8a66597->pdata->on_chip) {
snprintf(clk_name, sizeof(clk_name), "usb%d", pdev->id);

1
drivers/usb/gadget/r8a66597-udc.h
View File

@ -112,7 +112,6 @@ struct r8a66597 {
u16 old_dvsq;
/* pipe config */
unsigned short bi_bufnum; /* bulk and isochronous's bufnum */
unsigned char bulk;
unsigned char interrupt;
unsigned char isochronous;