mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-13 07:09:20 +03:00
fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
59 lines
2.1 KiB
Diff
59 lines
2.1 KiB
Diff
From 87ffb9bd9691230e919a306979217e572fd02690 Mon Sep 17 00:00:00 2001
|
|
From: Andy Green <andy@openmoko.com>
|
|
Date: Thu, 24 Jul 2008 00:04:44 +0100
|
|
Subject: [PATCH] fix-glamo-mci-possible-timeout-overflow.patch
|
|
|
|
The MMC stack hands us a timeout calibrated in SD_CLK clocks, but the
|
|
Glamo can only deal with up to 65520 clocks of timeout. If the stack
|
|
handed us a request bigger than this, it would just wrap and the
|
|
timeout we actually used would be way too short.
|
|
|
|
With this patch if that happens, we use the longest timeout we can,
|
|
65520 clocks and give it our best shot.
|
|
|
|
Signed-off-by: Andy Green <andy@openmoko.com>
|
|
---
|
|
drivers/mfd/glamo/glamo-mci.c | 19 ++++++++++---------
|
|
1 files changed, 10 insertions(+), 9 deletions(-)
|
|
|
|
diff --git a/drivers/mfd/glamo/glamo-mci.c b/drivers/mfd/glamo/glamo-mci.c
|
|
index 45b0afc..264a6bc 100644
|
|
--- a/drivers/mfd/glamo/glamo-mci.c
|
|
+++ b/drivers/mfd/glamo/glamo-mci.c
|
|
@@ -338,6 +338,7 @@ static int glamo_mci_send_command(struct glamo_mci_host *host,
|
|
{
|
|
u8 u8a[6];
|
|
u16 fire = 0;
|
|
+ u16 timeout = 0xfff; /* max glamo MMC timeout, in units of 16 clocks */
|
|
|
|
/* if we can't do it, reject as busy */
|
|
if (!readw_dly(host->base + GLAMO_REG_MMC_RB_STAT1) &
|
|
@@ -447,15 +448,15 @@ static int glamo_mci_send_command(struct glamo_mci_host *host,
|
|
fire |= GLAMO_FIRE_MMC_CC_BASIC; /* "basic command" */
|
|
break;
|
|
}
|
|
- /* enforce timeout */
|
|
- if (cmd->data) {
|
|
- if (cmd->data->timeout_clks)
|
|
- writew_dly(cmd->data->timeout_clks >> 4, /* / 16 clks */
|
|
- host->base + GLAMO_REG_MMC_TIMEOUT);
|
|
- else
|
|
- writew_dly(0xfff, host->base + GLAMO_REG_MMC_TIMEOUT);
|
|
- } else
|
|
- writew(0xfff, host->base + GLAMO_REG_MMC_TIMEOUT);
|
|
+ /* enforce timeout, clipping at default 65520 clocks if larger */
|
|
+ if (cmd->data)
|
|
+ /* so long as there is one... */
|
|
+ if (cmd->data->timeout_clks &&
|
|
+ /* ... and it is not longer than we can handle */
|
|
+ (cmd->data->timeout_clks <= 0xffff))
|
|
+ timeout = cmd->data->timeout_clks >> 4; /* / 16 clks */
|
|
+
|
|
+ writew(timeout, host->base + GLAMO_REG_MMC_TIMEOUT);
|
|
|
|
/* Generate interrupt on txfer */
|
|
writew_dly((readw_dly(host->base + GLAMO_REG_MMC_BASIC) & 0x3e) |
|
|
--
|
|
1.5.6.5
|
|
|