Merge tag 'davinci-fixes-for-v3.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci into next/drivers

The patch fixes EDMA crossbar mapping to actually
make it work. The patch has been tagged for stable.

* tag 'davinci-fixes-for-v3.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci:
  ARM: common: edma: Fix xbar mapping

2 files changed, 16 insertions, 34 deletions

diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
index cb6811e5ae5a..7ad75b4e0663 100644
--- a/arch/arm/boot/dts/am33xx.dtsi
+++ b/arch/arm/boot/dts/am33xx.dtsi
@@ -144,7 +144,7 @@
                         compatible = "ti,edma3";
                         ti,hwmods = "tpcc", "tptc0", "tptc1", "tptc2";
                         reg =   <0x49000000 0x10000>,
-                                <0x44e10f90 0x10>;
+                                <0x44e10f90 0x40>;
                         interrupts = <12 13 14>;
                         #dma-cells = <1>;
                         dma-channels = <64>;
diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 41bca32409fc..5339009b3c0c 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -1423,55 +1423,38 @@ EXPORT_SYMBOL(edma_clear_event);
 
 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DMADEVICES)
 
-static int edma_of_read_u32_to_s16_array(const struct device_node *np,
-                                         const char *propname, s16 *out_values,
-                                         size_t sz)
+static int edma_xbar_event_map(struct device *dev, struct device_node *node,
+                               struct edma_soc_info *pdata, size_t sz)
 {
-        int ret;
-
-        ret = of_property_read_u16_array(np, propname, out_values, sz);
-        if (ret)
-                return ret;
-
-        /* Terminate it */
-        *out_values++ = -1;
-        *out_values++ = -1;
-
-        return 0;
-}
-
-static int edma_xbar_event_map(struct device *dev,
-                               struct device_node *node,
-                               struct edma_soc_info *pdata, int len)
-{
-        int ret, i;
+        const char pname[] = "ti,edma-xbar-event-map";
         struct resource res;
         void __iomem *xbar;
-        const s16 (*xbar_chans)[2];
+        s16 (*xbar_chans)[2];
+        size_t nelm = sz / sizeof(s16);
         u32 shift, offset, mux;
+        int ret, i;
 
-        xbar_chans = devm_kzalloc(dev,
-                                  len/sizeof(s16) + 2*sizeof(s16),
-                                  GFP_KERNEL);
+        xbar_chans = devm_kzalloc(dev, (nelm + 2) * sizeof(s16), GFP_KERNEL);
         if (!xbar_chans)
                 return -ENOMEM;
 
         ret = of_address_to_resource(node, 1, &res);
         if (ret)
-                return -EIO;
+                return -ENOMEM;
 
         xbar = devm_ioremap(dev, res.start, resource_size(&res));
         if (!xbar)
                 return -ENOMEM;
 
-        ret = edma_of_read_u32_to_s16_array(node,
-                                            "ti,edma-xbar-event-map",
-                                            (s16 *)xbar_chans,
-                                            len/sizeof(u32));
+        ret = of_property_read_u16_array(node, pname, (u16 *)xbar_chans, nelm);
         if (ret)
                 return -EIO;
 
-        for (i = 0; xbar_chans[i][0] != -1; i++) {
+        /* Invalidate last entry for the other user of this mess */
+        nelm >>= 1;
+        xbar_chans[nelm][0] = xbar_chans[nelm][1] = -1;
+
+        for (i = 0; i < nelm; i++) {
                 shift = (xbar_chans[i][1] & 0x03) << 3;
                 offset = xbar_chans[i][1] & 0xfffffffc;
                 mux = readl(xbar + offset);
@@ -1480,8 +1463,7 @@ static int edma_xbar_event_map(struct device *dev,
                 writel(mux, (xbar + offset));
         }
 
-        pdata->xbar_chans = xbar_chans;
-
+        pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
         return 0;
 }