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Message-ID: <1275394956-26820-1-git-send-email-linus.walleij@stericsson.com>
Date: Tue, 1 Jun 2010 14:22:36 +0200
From: Linus Walleij <linus.walleij@...ricsson.com>
To: Dan Williams <dan.j.williams@...el.com>
Cc: <linux-kernel@...r.kernel.org>,
Jonas Aaberg <jonas.aberg@...ricsson.com>,
Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 16/18] DMAENGINE: ste_dma40: fix suspend bug
From: Jonas Aaberg <jonas.aberg@...ricsson.com>
This fixes a bug when suspending channels: first make the checks,
then suspend the channel, not the other way around.
Signed-off-by: Jonas Aaberg <jonas.aberg@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
drivers/dma/ste_dma40.c | 33 +++++++++++++--------------------
1 files changed, 13 insertions(+), 20 deletions(-)
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index ec092fa..5cde3c3 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -1250,7 +1250,7 @@ static int d40_free_dma(struct d40_chan *d40c)
{
int res = 0;
- u32 event, dir;
+ u32 event;
struct d40_phy_res *phy = d40c->phy_chan;
bool is_src;
struct d40_desc *d;
@@ -1282,21 +1282,12 @@ static int d40_free_dma(struct d40_chan *d40c)
return -EINVAL;
}
- res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
- if (res) {
- dev_err(&d40c->chan.dev->device, "[%s] suspend failed\n",
- __func__);
- return res;
- }
-
if (d40c->dma_cfg.dir == STEDMA40_MEM_TO_PERIPH ||
d40c->dma_cfg.dir == STEDMA40_MEM_TO_MEM) {
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dst_dev_type);
- dir = D40_CHAN_REG_SDLNK;
is_src = false;
} else if (d40c->dma_cfg.dir == STEDMA40_PERIPH_TO_MEM) {
event = D40_TYPE_TO_EVENT(d40c->dma_cfg.src_dev_type);
- dir = D40_CHAN_REG_SSLNK;
is_src = true;
} else {
dev_err(&d40c->chan.dev->device,
@@ -1304,16 +1295,17 @@ static int d40_free_dma(struct d40_chan *d40c)
return -EINVAL;
}
+ res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ);
+ if (res) {
+ dev_err(&d40c->chan.dev->device, "[%s] suspend failed\n",
+ __func__);
+ return res;
+ }
+
if (d40c->log_num != D40_PHY_CHAN) {
- /*
- * Release logical channel, deactivate the event line during
- * the time physical res is suspended.
- */
- writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event)) &
- D40_EVENTLINE_MASK(event),
- d40c->base->virtbase + D40_DREG_PCBASE +
- phy->num * D40_DREG_PCDELTA + dir);
+ /* Release logical channel, deactivate the event line */
+ d40_config_set_event(d40c, false);
d40c->base->lookup_log_chans[d40c->log_num] = NULL;
/*
@@ -1334,8 +1326,9 @@ static int d40_free_dma(struct d40_chan *d40c)
}
return 0;
}
- } else
- d40_alloc_mask_free(phy, is_src, 0);
+ } else {
+ (void) d40_alloc_mask_free(phy, is_src, 0);
+ }
/* Release physical channel */
res = d40_channel_execute_command(d40c, D40_DMA_STOP);
--
1.6.3.3
--
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