of: also handle dma-noncoherent in of_dma_is_coherent()

of_dma_is_coherent() currently expects the architecture to be
non-coherent and some devices being coherent getting marked
as such with the dma-coherent devicetree property.

For PowerPC CONFIG_OF_DMA_DEFAULT_COHERENT was added which currently
makes of_dma_is_coherent() always return true but doesn't handle
the case of the architecture being coherent but some devices not.

So modify the function to also check for dma-noncoherent and
set a suitable default return value. If CONFIG_OF_DMA_DEFAULT_COHERENT
is set the value starts with true and finding dma-noncoherent will
set it to false and without CONFIG_OF_DMA_DEFAULT_COHERENT, the
behaviour is reversed.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220706231536.2041855-2-heiko@sntech.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 94f017d..96f0a12 100644 (file)
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -1045,26 +1045,29 @@ phys_addr_t __init of_dma_get_max_cpu_address(struct device_node *np)
  *
  * It returns true if "dma-coherent" property was found
  * for this device in the DT, or if DMA is coherent by
- * default for OF devices on the current platform.
+ * default for OF devices on the current platform and no
+ * "dma-noncoherent" property was found for this device.
  */
 bool of_dma_is_coherent(struct device_node *np)
 {
        struct device_node *node;
-
-       if (IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT))
-               return true;
+       bool is_coherent = IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT);
 
        node = of_node_get(np);
 
        while (node) {
                if (of_property_read_bool(node, "dma-coherent")) {
-                       of_node_put(node);
-                       return true;
+                       is_coherent = true;
+                       break;
+               }
+               if (of_property_read_bool(node, "dma-noncoherent")) {
+                       is_coherent = false;
+                       break;
                }
                node = of_get_next_dma_parent(node);
        }
        of_node_put(node);
-       return false;
+       return is_coherent;
 }
 EXPORT_SYMBOL_GPL(of_dma_is_coherent);