driver/ddr/fsl: Add workaround for erratum A-009801
The initial training for the DDRC may provide results that are not
optimized. The workaround provides better read timing margins.
Signed-off-by: Shengzhou Liu <Shengzhou.Liu@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/include/fsl_ddr_sdram.h b/include/fsl_ddr_sdram.h
index acddf14..486e47e 100644
--- a/include/fsl_ddr_sdram.h
+++ b/include/fsl_ddr_sdram.h
@@ -189,6 +189,10 @@
#define DDR_MR5_CA_PARITY_LAT_4_CLK 0x1 /* for DDR4-1600/1866/2133 */
#define DDR_MR5_CA_PARITY_LAT_5_CLK 0x2 /* for DDR4-2400 */
+/* DEBUG_26 register */
+#define DDR_CAS_TO_PRE_SUB_MASK 0x0000f000 /* CAS to preamble subtract value */
+#define DDR_CAS_TO_PRE_SUB_SHIFT 12
+
/* DEBUG_29 register */
#define DDR_TX_BD_DIS (1 << 10) /* Transmit Bit Deskew Disable */