Hi vinod
On Tue, Jul 07, 2015 at 09:50:57AM +0530, Vinod Koul wrote:
> On Tue, Jun 23, 2015 at 04:42:54PM +0800, Shengjiu Wang wrote:
> > +static void sdma_set_watermarklevel_for_p2p(struct sdma_channel *sdmac)
> > +{
> > + struct sdma_engine *sdma = sdmac->sdma;
> > +
> > + int lwml = sdmac->watermark_level & 0xff;
> > + int hwml = (sdmac->watermark_level >> 16) & 0xff;
> > +
> > + if (sdmac->event_id0 > 31) {
> > + sdmac->event_mask[0] |= 0;
> > + __set_bit(28, &sdmac->watermark_level);
> why not use set_bit(), you are modifying driver memory
Original driver all use the __set_bit. do you think we need to change
all the __set_bit to set_bit? And from the header file "arch/arm/include/asm
/bitops.h", the set_bit is same as __set_bit.
>
>
> > + sdmac->event_mask[1] |=
> > + BIT(sdmac->event_id0 % 32);
> and then why not use set_bit() here too?
>
> > + } else {
> > + sdmac->event_mask[0] |= 0;
> > + sdmac->event_mask[1] |=
> > + BIT(sdmac->event_id0 % 32);
> > + }
> > + if (sdmac->event_id1 > 31) {
> > + sdmac->event_mask[1] |= 0;
> > + __set_bit(29, &sdmac->watermark_level);
> > + sdmac->event_mask[0] |=
> > + BIT(sdmac->event_id1 % 32);
> > + } else {
> > + sdmac->event_mask[1] |= 0;
> > + sdmac->event_mask[0] |=
> > + BIT(sdmac->event_id1 % 32);
> > + }
> pattern for eventidX is repeated, also in that we can make generic macro to
> handle and reduce code size
I will change this.
>
> > +
> > + /*
> > + * If LWML(src_maxburst) > HWML(dst_maxburst), we need
> > + * swap LWML and HWML of INFO(A.3.2.5.1), also need swap
> > + * r0(event_mask[1]) and r1(event_mask[0]).
> > + */
> > + if (lwml > hwml) {
> > + sdmac->watermark_level &= ~0xff00ff;
> Magic number?
>
> > static int sdma_config_channel(struct dma_chan *chan)
> > {
> > struct sdma_channel *sdmac = to_sdma_chan(chan);
> > @@ -869,6 +945,12 @@ static int sdma_config_channel(struct dma_chan *chan)
> > sdma_event_enable(sdmac, sdmac->event_id0);
> > }
> >
> > + if (sdmac->event_id1) {
> > + if (sdmac->event_id1 >= sdmac->sdma->drvdata->num_events)
> > + return -EINVAL;
> > + sdma_event_enable(sdmac, sdmac->event_id1);
> > + }
> > +
> > switch (sdmac->peripheral_type) {
> > case IMX_DMATYPE_DSP:
> > sdma_config_ownership(sdmac, false, true, true);
> > @@ -887,19 +969,21 @@ static int sdma_config_channel(struct dma_chan *chan)
> > (sdmac->peripheral_type != IMX_DMATYPE_DSP)) {
> > /* Handle multiple event channels differently */
> > if (sdmac->event_id1) {
> > - sdmac->event_mask[1] = BIT(sdmac->event_id1 % 32);
> > - if (sdmac->event_id1 > 31)
> > - __set_bit(31, &sdmac->watermark_level);
> > - sdmac->event_mask[0] = BIT(sdmac->event_id0 % 32);
> > - if (sdmac->event_id0 > 31)
> > - __set_bit(30, &sdmac->watermark_level);
> > - } else {
> > + if (sdmac->peripheral_type == IMX_DMATYPE_ASRC_SP ||
> > + sdmac->peripheral_type == IMX_DMATYPE_ASRC)
> > + sdma_set_watermarklevel_for_p2p(sdmac);
> > + } else
> > __set_bit(sdmac->event_id0, sdmac->event_mask);
> > - }
> > +
> > /* Watermark Level */
> > sdmac->watermark_level |= sdmac->watermark_level;
> > /* Address */
> > - sdmac->shp_addr = sdmac->per_address;
> > + if (sdmac->direction == DMA_DEV_TO_DEV) {
> Okay the direction is depreciated, so can you store both source and
> destination and use them based on direction in prepare()
>
> Also I see driver is not doing this, so while at it, can you fix this is
> current code as well
>
which prepare() do you mean? sdma_prep_dma_cyclic, sdma_prep_slave_sg?
> --
> ~Vinod
>
best regards
wang shengjiu
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