fsl_esdhc: Add the workaround for erratum ESDHC135 (enable on P4080)

The default value of the SRS, VS18 and VS30 and ADMAS fields in the host
controller capabilities register (HOSTCAPBLT) are incorrect. The default
of these bits should be zero instead of one.

Clear these bits out when we read HOSTCAPBLT.

Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/cpu/mpc85xx/cmd_errata.c

@@ -53,6 +53,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #if defined(CONFIG_SYS_FSL_ERRATUM_ESDHC111)
 	puts("Work-around for Erratum ESDHC111 enabled\n");
 #endif
+#if defined(CONFIG_SYS_FSL_ERRATUM_ESDHC135)
+	puts("Work-around for Erratum ESDHC135 enabled\n");
+#endif
 	return 0;
 }
 

drivers/mmc/fsl_esdhc.c

@@ -472,6 +472,11 @@ int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg *cfg)
 
 	voltage_caps = 0;
 	caps = regs->hostcapblt;
+
+#ifdef CONFIG_SYS_FSL_ERRATUM_ESDHC135
+	caps = caps & ~(ESDHC_HOSTCAPBLT_SRS |
+			ESDHC_HOSTCAPBLT_VS18 | ESDHC_HOSTCAPBLT_VS30);
+#endif
 	if (caps & ESDHC_HOSTCAPBLT_VS18)
 		voltage_caps |= MMC_VDD_165_195;
 	if (caps & ESDHC_HOSTCAPBLT_VS30)

include/configs/P4080DS.h

@@ -36,6 +36,7 @@
 #define CONFIG_ICS307_REFCLK_HZ		33333000  /* ICS307 ref clk freq */
 
 #define CONFIG_SYS_FSL_ERRATUM_ESDHC111
+#define CONFIG_SYS_FSL_ERRATUM_ESDHC135
 
 #define CONFIG_SYS_P4080_ERRATUM_CPU22
 #define CONFIG_SYS_P4080_ERRATUM_SERDES8