mmc: sh_mmcif: simplify IRQ processing

The classical way to process IRQs is read out the status, ack all triggered
IRQs, possibly mask them, then process them. Follow this simple procesure
instead of the current complex custom algorithm.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index b4180c7bffc444c5caead0609b5e60069dec0abf..0189efcb9e125dfb1042964fb85c3a2512293497 100644 (file)
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -129,6 +129,10 @@
                                 INT_CCSTO | INT_CRCSTO | INT_WDATTO |    \
                                 INT_RDATTO | INT_RBSYTO | INT_RSPTO)
 
+#define INT_ALL                        (INT_RBSYE | INT_CRSPE | INT_BUFREN |    \
+                                INT_BUFWEN | INT_CMD12DRE | INT_BUFRE | \
+                                INT_DTRANE | INT_CMD12RBE | INT_CMD12CRE)
+
 /* CE_INT_MASK */
 #define MASK_ALL               0x00000000
 #define MASK_MCCSDE            (1 << 29)
@@ -160,6 +164,11 @@
                                 MASK_MCCSTO | MASK_MCRCSTO | MASK_MWDATTO | \
                                 MASK_MRDATTO | MASK_MRBSYTO | MASK_MRSPTO)
 
+#define MASK_CLEAN             (INT_ERR_STS | MASK_MRBSYE | MASK_MCRSPE |      \
+                                MASK_MBUFREN | MASK_MBUFWEN |                  \
+                                MASK_MCMD12DRE | MASK_MBUFRE | MASK_MDTRANE |  \
+                                MASK_MCMD12RBE | MASK_MCMD12CRE)
+
 /* CE_HOST_STS1 */
 #define STS1_CMDSEQ            (1 << 31)
 
@@ -1233,58 +1242,22 @@ static irqreturn_t sh_mmcif_intr(int irq, void *dev_id)
 {
        struct sh_mmcif_host *host = dev_id;
        u32 state;
-       int err = 0;
 
        state = sh_mmcif_readl(host->addr, MMCIF_CE_INT);
+       sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~state);
+       sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state & MASK_CLEAN);
 
-       if (state & INT_ERR_STS) {
-               /* error interrupts - process first */
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~state);
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state);
-               err = 1;
-       } else if (state & INT_RBSYE) {
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT,
-                               ~(INT_RBSYE | INT_CRSPE));
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MRBSYE);
-       } else if (state & INT_CRSPE) {
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_CRSPE);
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCRSPE);
-       } else if (state & INT_BUFREN) {
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFREN);
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
-       } else if (state & INT_BUFWEN) {
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT,
-                               ~(INT_BUFWEN | INT_DTRANE | INT_CMD12DRE |
-                                 INT_CMD12RBE | INT_CMD12CRE));
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
-       } else if (state & INT_CMD12DRE) {
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT,
-                       ~(INT_CMD12DRE | INT_CMD12RBE |
-                         INT_CMD12CRE | INT_BUFRE));
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCMD12DRE);
-       } else if (state & INT_BUFRE) {
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~INT_BUFRE);
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
-       } else if (state & INT_DTRANE) {
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT,
-                       ~(INT_CMD12DRE | INT_CMD12RBE |
-                         INT_CMD12CRE | INT_DTRANE));
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
-       } else if (state & INT_CMD12RBE) {
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT,
-                               ~(INT_CMD12RBE | INT_CMD12CRE));
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, MASK_MCMD12RBE);
-       } else {
-               dev_dbg(&host->pd->dev, "Unsupported interrupt: 0x%x\n", state);
-               sh_mmcif_writel(host->addr, MMCIF_CE_INT, ~state);
-               sh_mmcif_bitclr(host, MMCIF_CE_INT_MASK, state);
-               err = 1;
-       }
-       if (err) {
+       if (state & ~MASK_CLEAN)
+               dev_dbg(&host->pd->dev, "IRQ state = 0x%08x incompletely cleared\n",
+                       state);
+
+       if (state & INT_ERR_STS || state & ~INT_ALL) {
                host->sd_error = true;
-               dev_dbg(&host->pd->dev, "int err state = %08x\n", state);
+               dev_dbg(&host->pd->dev, "int err state = 0x%08x\n", state);
        }
        if (state & ~(INT_CMD12RBE | INT_CMD12CRE)) {
+               if (!host->mrq)
+                       dev_dbg(&host->pd->dev, "NULL IRQ state = 0x%08x\n", state);
                if (!host->dma_active)
                        return IRQ_WAKE_THREAD;
                else if (host->sd_error)