Add transpose operations on two 32-bit words, using normal or reverse
order.
To be used by the Atari DRM driver.
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
drivers/video/fbdev/c2p_core.h | 38 ++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/video/fbdev/c2p_core.h b/drivers/video/fbdev/c2p_core.h
index cf5f1ebce65e6afd..480bd80fb31b57c0 100644
--- a/drivers/video/fbdev/c2p_core.h
+++ b/drivers/video/fbdev/c2p_core.h
@@ -142,6 +142,44 @@ static __always_inline void transp4x(u32 d[], unsigned int n, unsigned int m)
}
+ /*
+ * Transpose operations on 2 32-bit words
+ */
+
+static __always_inline void transp2(u32 d[], unsigned int n, unsigned int m)
+{
+ u32 mask = get_mask(n);
+
+ switch (m) {
+ case 1:
+ /* Single n x 1 block */
+ _transp(d, 0, 1, n, mask);
+ return;
+ }
+
+ BUILD_BUG();
+}
+
+
+ /*
+ * Transpose operations on 2 32-bit words (reverse order)
+ */
+
+static __always_inline void transp2x(u32 d[], unsigned int n, unsigned int m)
+{
+ u32 mask = get_mask(n);
+
+ switch (m) {
+ case 1:
+ /* Single n x 1 block */
+ _transp(d, 1, 0, n, mask);
+ return;
+ }
+
+ BUILD_BUG();
+}
+
+
/*
* Compose two values, using a bitmask as decision value
* This is equivalent to (a & mask) | (b & ~mask)
--
2.25.1
