drivers : usb: fsl: Implement usb Erratum A007798 workaround

Set TXFIFOTHRESH to adjust ddr pipeline delay for successful large
usb writes

Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

arch/powerpc/cpu/mpc85xx/cmd_errata.c

@@ -294,6 +294,10 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	if (has_erratum_a007075())
 		puts("Work-around for Erratum A007075 enabled\n");
 #endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A007798
+	if (has_erratum_a007798())
+		puts("Work-around for Erratum A007798 enabled\n");
+#endif
 #ifdef CONFIG_SYS_FSL_ERRATUM_I2C_A004447
 	if ((SVR_SOC_VER(svr) == SVR_8548 && IS_SVR_REV(svr, 3, 1)) ||
 	    (SVR_REV(svr) <= CONFIG_SYS_FSL_A004447_SVR_REV))

arch/powerpc/include/asm/config_mpc85xx.h

@@ -678,6 +678,7 @@
 #define CONFIG_SYS_FSL_ERRATUM_A006379
 #define CONFIG_SYS_FSL_ERRATUM_A007186
 #define CONFIG_SYS_FSL_ERRATUM_A006593
+#define CONFIG_SYS_FSL_ERRATUM_A007798
 #define CONFIG_SYS_CCSRBAR_DEFAULT	0xfe000000
 #define CONFIG_SYS_FSL_SFP_VER_3_0
 #define CONFIG_SYS_FSL_PCI_VER_3_X

drivers/usb/host/ehci-fsl.c

@@ -130,8 +130,7 @@ int ehci_hcd_init(int index, enum usb_init_type init,
 
 	in_le32(&ehci->usbmode);
 
-	if (SVR_SOC_VER(get_svr()) == SVR_T4240 &&
-	    IS_SVR_REV(get_svr(), 2, 0))
+	if (has_erratum_a007798())
 		set_txfifothresh(ehci, TXFIFOTHRESH);
 
 	return 0;

include/fsl_usb.h

@@ -139,6 +139,12 @@ static inline bool has_erratum_a007075(void)
 	}
 	return false;
 }
+
+static inline bool has_erratum_a007798(void)
+{
+	return SVR_SOC_VER(get_svr()) == SVR_T4240 &&
+		IS_SVR_REV(get_svr(), 2, 0);
+}
 #else
 static inline bool has_erratum_a006261(void)
 {
@@ -150,5 +156,10 @@ static inline bool has_erratum_a007075(void)
 	return false;
 }
 
+static inline bool has_erratum_a007798(void)
+{
+	return false;
+}
+
 #endif
 #endif /*_ASM_FSL_USB_H_ */