From: Vinod Koul <vinod.koul@intel.com>
To: Andy Shevchenko <andriy.shevchenko@linux.jf.intel.com>
Cc: linux-kernel@vger.kernel.org,
Viresh Kumar <viresh.kumar@linaro.org>,
spear-devel <spear-devel@list.st.com>
Subject: Re: [resend][PATCH 11/16] dw_dmac: backlink to dw_dma in dw_dma_chan is superfluous
Date: Wed, 9 Jan 2013 06:24:43 -0800 [thread overview]
Message-ID: <20130109142443.GQ19691@intel.com> (raw)
In-Reply-To: <1357719435-29955-12-git-send-email-andriy.shevchenko@linux.intel.com>
On Wed, Jan 09, 2013 at 10:17:10AM +0200, Andy Shevchenko wrote:
> The same information could be exctracted from the struct dma_chan.
typo... ^^^^^^^^^^
> The patch introduces helper function dwc_get_data_width() as well.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
> 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 ff9d68b..39a6506 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
>
> +#define SRC_MASTER 0
> +#define DST_MASTER 1
> +
> +static inline unsigned int dwc_get_data_width(struct dma_chan *chan, int master)
> +{
> + struct dw_dma *dw = to_dw_dma(chan->device);
> + struct dw_dma_slave *dws = chan->private;
> +
> + if (master == SRC_MASTER)
> + return dw->data_width[dwc_get_sms(dws)];
> + else if (master == DST_MASTER)
> + return dw->data_width[dwc_get_dms(dws)];
> +
> + return 0;
> +}
> +
> /*----------------------------------------------------------------------*/
>
> /*
> @@ -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_t(unsigned int, dwc_get_data_width(chan, SRC_MASTER),
> + dwc_get_data_width(chan, DST_MASTER));
>
> 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_data_width(chan, SRC_MASTER);
>
> 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_data_width(chan, DST_MASTER);
>
> 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 prev parent reply other threads:[~2013-01-09 14:49 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-07 12:54 dw_dmac patches Andy Shevchenko
2013-01-08 15:54 ` Vinod Koul
2013-01-09 8:16 ` [resend][PATCH 00/16] dw_dmac related patchset Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 01/16] dw_dmac: call .probe after we have a device in place Andy Shevchenko
2013-01-09 13:47 ` Vinod Koul
2013-01-09 14:56 ` Andy Shevchenko
2013-01-09 15:38 ` Vinod Koul
2013-01-09 18:04 ` Mika Westerberg
2013-01-12 12:28 ` Vinod Koul
2013-01-10 8:34 ` Viresh Kumar
2013-01-12 12:30 ` Vinod Koul
2013-01-09 8:17 ` [resend][PATCH 02/16] dw_dmac: absence of pdata isn't critical when autocfg is set Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 03/16] dmaengine: introduce is_slave_xfer function Andy Shevchenko
2013-01-09 13:50 ` Vinod Koul
2013-01-09 14:19 ` Viresh Kumar
2013-01-09 14:58 ` Andy Shevchenko
2013-01-09 15:10 ` Vinod Koul
2013-01-09 15:51 ` Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 04/16] dma: at_hdmac: check direction properly for cyclic transfers Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 05/16] dma: dw_dmac: check direction properly in dw_dma_cyclic_prep Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 06/16] dma: ep93xx_dma: reuse is_slave_xfer helper Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 07/16] dma: ipu_idmac: " Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 08/16] dma: ste_dma40: " Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 09/16] dw_dmac: store direction in the custom channel structure Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 10/16] dw_dmac: make usage of dw_dma_slave optional Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 11/16] dw_dmac: backlink to dw_dma in dw_dma_chan is superfluous Andy Shevchenko
2013-01-09 14:24 ` Vinod Koul [this message]
2013-01-09 15:02 ` Andy Shevchenko
2013-01-09 15:11 ` Vinod Koul
2013-01-09 8:17 ` [resend][PATCH 12/16] dw_dmac: check for mapping errors Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 13/16] dw_dmac: remove redundant check Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 14/16] dw_dmac: update tx_node_active in dwc_do_single_block Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 15/16] dma: dw_dmac: add dwc_chan_pause and dwc_chan_resume Andy Shevchenko
2013-01-09 8:17 ` [resend][PATCH 16/16] dma: dw_dmac: clear suspend bit during termination Andy Shevchenko
2013-01-09 14:18 ` Vinod Koul
2013-01-09 15:07 ` Andy Shevchenko
2013-01-09 15:44 ` [resend][PATCH 00/16] dw_dmac related patchset Vinod Koul
2013-01-10 8:28 ` Andy Shevchenko
2013-01-09 11:26 ` dw_dmac patches Andy Shevchenko
2013-01-11 12:01 ` Andy Shevchenko
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