ARM: PL08x: avoid duplicating registers in txd and phychan structures

As we now have all the code accessing the phychan {csrc,cdst,clli,cctl,
ccfg} members in one function, there's no point storing the data into
the struct.  Get rid of the struct members.  Re-order the register dump
in the dev_dbg() to reflect the order we write the registers to the DMA
device.

The txd {csrc,cdst,clli,cctl} values are duplicates of the lli[0]
values, so there's no point duplicating these either.  Program the DMAC
registers directly from the lli[0] values.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

2 files changed, 19 insertions, 51 deletions

diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index c025a4b4bae4..a1a18bde6b7f 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -193,33 +193,25 @@ static void pl08x_start_txd(struct pl08x_dma_chan *plchan,
 {
         struct pl08x_driver_data *pl08x = plchan->host;
         struct pl08x_phy_chan *phychan = plchan->phychan;
-        u32 val;
+        struct pl08x_lli *lli = &txd->llis_va[0];
+        u32 val, ccfg;
 
         plchan->at = txd;
 
-        /* Copy the basic control register calculated at transfer config */
-        phychan->csrc = txd->csrc;
-        phychan->cdst = txd->cdst;
-        phychan->clli = txd->clli;
-        phychan->cctl = txd->cctl;
-
         /* Assign the signal to the proper control registers */
-        phychan->ccfg = plchan->cd->ccfg;
-        phychan->ccfg &= ~PL080_CONFIG_SRC_SEL_MASK;
-        phychan->ccfg &= ~PL080_CONFIG_DST_SEL_MASK;
+        ccfg = plchan->cd->ccfg;
+        ccfg &= ~(PL080_CONFIG_SRC_SEL_MASK | PL080_CONFIG_DST_SEL_MASK);
+
         /* If it wasn't set from AMBA, ignore it */
         if (txd->direction == DMA_TO_DEVICE)
                 /* Select signal as destination */
-                phychan->ccfg |=
-                        (phychan->signal << PL080_CONFIG_DST_SEL_SHIFT);
+                ccfg |= phychan->signal << PL080_CONFIG_DST_SEL_SHIFT;
         else if (txd->direction == DMA_FROM_DEVICE)
                 /* Select signal as source */
-                phychan->ccfg |=
-                        (phychan->signal << PL080_CONFIG_SRC_SEL_SHIFT);
-        /* Always enable error interrupts */
-        phychan->ccfg |= PL080_CONFIG_ERR_IRQ_MASK;
-        /* Always enable terminal interrupts */
-        phychan->ccfg |= PL080_CONFIG_TC_IRQ_MASK;
+                ccfg |= phychan->signal << PL080_CONFIG_SRC_SEL_SHIFT;
+
+        /* Always enable error and terminal interrupts */
+        ccfg |= PL080_CONFIG_ERR_IRQ_MASK | PL080_CONFIG_TC_IRQ_MASK;
 
         /* Wait for channel inactive */
         while (pl08x_phy_channel_busy(phychan))
@@ -227,19 +219,15 @@ static void pl08x_start_txd(struct pl08x_dma_chan *plchan,
 
         dev_vdbg(&pl08x->adev->dev,
                 "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, "
-                 "cctl=0x%08x, clli=0x%08x, ccfg=0x%08x\n",
-                phychan->id,
-                phychan->csrc,
-                phychan->cdst,
-                phychan->cctl,
-                phychan->clli,
-                phychan->ccfg);
-
-        writel(phychan->csrc, phychan->base + PL080_CH_SRC_ADDR);
-        writel(phychan->cdst, phychan->base + PL080_CH_DST_ADDR);
-        writel(phychan->clli, phychan->base + PL080_CH_LLI);
-        writel(phychan->cctl, phychan->base + PL080_CH_CONTROL);
-        writel(phychan->ccfg, phychan->base + PL080_CH_CONFIG);
+                "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n",
+                phychan->id, lli->src, lli->dst, lli->lli, lli->cctl,
+                ccfg);
+
+        writel(lli->src, phychan->base + PL080_CH_SRC_ADDR);
+        writel(lli->dst, phychan->base + PL080_CH_DST_ADDR);
+        writel(lli->lli, phychan->base + PL080_CH_LLI);
+        writel(lli->cctl, phychan->base + PL080_CH_CONTROL);
+        writel(ccfg, phychan->base + PL080_CH_CONFIG);
 
         /* Enable the DMA channel */
         /* Do not access config register until channel shows as disabled */
@@ -920,13 +908,6 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
          */
         llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN;
 
-        /* Now store the channel register values */
-        txd->csrc = llis_va[0].src;
-        txd->cdst = llis_va[0].dst;
-        txd->clli = llis_va[0].lli;
-        txd->cctl = llis_va[0].cctl;
-        /* ccfg will be set at physical channel allocation time */
-
 #ifdef VERBOSE_DEBUG
         {
                 int i;
diff --git a/include/linux/amba/pl08x.h b/include/linux/amba/pl08x.h
index 2c834ed5f41f..29d974562df9 100644
--- a/include/linux/amba/pl08x.h
+++ b/include/linux/amba/pl08x.h
@@ -95,11 +95,6 @@ struct pl08x_phy_chan {
         spinlock_t lock;
         int signal;
         struct pl08x_dma_chan *serving;
-        u32 csrc;
-        u32 cdst;
-        u32 clli;
-        u32 cctl;
-        u32 ccfg;
 };
 
 /**
@@ -118,14 +113,6 @@ struct pl08x_txd {
         void *llis_va;
         struct pl08x_channel_data *cd;
         bool active;
-        /*
-         * Settings to be put into the physical channel when we
-         * trigger this txd
-         */
-        u32 csrc;
-        u32 cdst;
-        u32 clli;
-        u32 cctl;
 };
 
 /**