From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Vinod Koul <vinod.koul@intel.com>,
spear-devel <spear-devel@list.st.com>,
linux-kernel@vger.kernel.org,
Viresh Kumar <viresh.kumar@linaro.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: [PATCH 1/2] dw_dmac: backlink to dw_dma in dw_dma_chan is superfluous
Date: Mon, 10 Dec 2012 13:36:32 +0200 [thread overview]
Message-ID: <1355139393-6718-1-git-send-email-andriy.shevchenko@linux.intel.com> (raw)
The same information could be exctracted from the struct dma_chan.
The patch introduces two helpers dwc_get_src_data_width() and
dwc_get_dst_data_width() as well.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/dma/dw_dmac.c | 27 ++++++++++++++++++++-------
drivers/dma/dw_dmac_regs.h | 3 ---
2 files changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index fdae96f..a9e9a07 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -73,6 +73,22 @@ static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
*/
#define NR_DESCS_PER_CHANNEL 64
+static inline unsigned int dwc_get_src_data_width(struct dma_chan *chan)
+{
+ struct dw_dma *dw = to_dw_dma(chan->device);
+ struct dw_dma_slave *dws = chan->private;
+
+ return dw->data_width[dwc_get_sms(dws)];
+}
+
+static inline unsigned int dwc_get_dst_data_width(struct dma_chan *chan)
+{
+ struct dw_dma *dw = to_dw_dma(chan->device);
+ struct dw_dma_slave *dws = chan->private;
+
+ return dw->data_width[dwc_get_dms(dws)];
+}
+
/*----------------------------------------------------------------------*/
/*
@@ -703,7 +719,6 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
- struct dw_dma_slave *dws = chan->private;
struct dw_desc *desc;
struct dw_desc *first;
struct dw_desc *prev;
@@ -726,8 +741,8 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
dwc->direction = DMA_MEM_TO_MEM;
- data_width = min_t(unsigned int, dwc->dw->data_width[dwc_get_sms(dws)],
- dwc->dw->data_width[dwc_get_dms(dws)]);
+ data_width = min(dwc_get_src_data_width(chan),
+ dwc_get_dst_data_width(chan));
src_width = dst_width = min_t(unsigned int, data_width,
dwc_fast_fls(src | dest | len));
@@ -792,7 +807,6 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned long flags, void *context)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
- struct dw_dma_slave *dws = chan->private;
struct dma_slave_config *sconfig = &dwc->dma_sconfig;
struct dw_desc *prev;
struct dw_desc *first;
@@ -826,7 +840,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
DWC_CTLL_FC(DW_DMA_FC_D_M2P);
- data_width = dwc->dw->data_width[dwc_get_sms(dws)];
+ data_width = dwc_get_src_data_width(chan);
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
@@ -889,7 +903,7 @@ slave_sg_todev_fill_desc:
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
DWC_CTLL_FC(DW_DMA_FC_D_P2M);
- data_width = dwc->dw->data_width[dwc_get_dms(dws)];
+ data_width = dwc_get_dst_data_width(chan);
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
@@ -1720,7 +1734,6 @@ static int dw_probe(struct platform_device *pdev)
channel_clear_bit(dw, CH_EN, dwc->mask);
- dwc->dw = dw;
dwc->direction = DMA_TRANS_NONE;
/* hardware configuration */
diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
index f9532c2..577f2dd 100644
--- a/drivers/dma/dw_dmac_regs.h
+++ b/drivers/dma/dw_dmac_regs.h
@@ -214,9 +214,6 @@ struct dw_dma_chan {
/* configuration passed via DMA_SLAVE_CONFIG */
struct dma_slave_config dma_sconfig;
-
- /* backlink to dw_dma */
- struct dw_dma *dw;
};
static inline struct dw_dma_chan_regs __iomem *
--
1.7.10.4
next reply other threads:[~2012-12-10 11:36 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-10 11:36 Andy Shevchenko [this message]
2012-12-10 11:36 ` [PATCH 2/2] dw_dmac: check for mapping errors Andy Shevchenko
2012-12-10 13:57 ` Viresh Kumar
2012-12-10 13:50 ` [PATCH 1/2] dw_dmac: backlink to dw_dma in dw_dma_chan is superfluous Viresh Kumar
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