ENGR00290361-1 IPUv3 IC:Add check for a IDMAC errata

[karo-tx-linux.git] / drivers / mxc / ipu3 / ipu_param_mem.h

diff --git a/drivers/mxc/ipu3/ipu_param_mem.h b/drivers/mxc/ipu3/ipu_param_mem.h
index f0e2f17a5f37ab286145295078b5a3c5f74cfb08..2ff622b54824a7a9c2b2e6c5ab7455e005b3f5de 100644 (file)
--- a/drivers/mxc/ipu3/ipu_param_mem.h
+++ b/drivers/mxc/ipu3/ipu_param_mem.h
@@ -898,4 +898,24 @@ static inline void _ipu_ch_param_set_bandmode(struct ipu_soc *ipu,
        dev_dbg(ipu->dev, "BNDM 0x%x, ",
                 ipu_ch_param_read_field_io(ipu_ch_param_addr(ipu, ch), 0, 114, 3));
 }
+
+/*
+ * The IPUv3 IDMAC has a bug to read 32bpp pixels from a graphics plane
+ * whose alpha component is at the most significant 8 bits. The bug only
+ * impacts on cases in which the relevant separate alpha channel is enabled.
+ *
+ * Return true on bad alpha component position, otherwise, return false.
+ */
+static inline bool _ipu_ch_param_bad_alpha_pos(uint32_t pixel_fmt)
+{
+       switch (pixel_fmt) {
+       case IPU_PIX_FMT_BGRA32:
+       case IPU_PIX_FMT_BGR32:
+       case IPU_PIX_FMT_RGBA32:
+       case IPU_PIX_FMT_RGB32:
+               return true;
+       }
+
+       return false;
+}
 #endif