ARM: OMAP2+: gpmc: fix gpmc_hwecc_bch_capable()

This patch adds bch8 ecc software fallback which is mostly used by
omap3s because they lack hardware elm support.

Fixes: 0611c41934ab35ce84dea34ab291897ad3cbc7be (ARM: OMAP2+: gpmc:
update gpmc_hwecc_bch_capable() for new platforms and ECC schemes)
Cc: <stable@vger.kernel.org> # 3.15.x+
Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Reviewed-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c
index 17cd39360afe..93914d220069 100644
--- a/arch/arm/mach-omap2/gpmc-nand.c
+++ b/arch/arm/mach-omap2/gpmc-nand.c
@@ -50,6 +50,16 @@ static bool gpmc_hwecc_bch_capable(enum omap_ecc ecc_opt)
                  soc_is_omap54xx() || soc_is_dra7xx())
                 return 1;
 
+        if (ecc_opt == OMAP_ECC_BCH4_CODE_HW_DETECTION_SW ||
+                 ecc_opt == OMAP_ECC_BCH8_CODE_HW_DETECTION_SW) {
+                if (cpu_is_omap24xx())
+                        return 0;
+                else if (cpu_is_omap3630() && (GET_OMAP_REVISION() == 0))
+                        return 0;
+                else
+                        return 1;
+        }
+
         /* OMAP3xxx do not have ELM engine, so cannot support ECC schemes
          * which require H/W based ECC error detection */
         if ((cpu_is_omap34xx() || cpu_is_omap3630()) &&
@@ -57,14 +67,6 @@ static bool gpmc_hwecc_bch_capable(enum omap_ecc ecc_opt)
                  (ecc_opt == OMAP_ECC_BCH8_CODE_HW)))
                 return 0;
 
-        /*
-         * For now, assume 4-bit mode is only supported on OMAP3630 ES1.x, x>=1
-         * and AM33xx derivates. Other chips may be added if confirmed to work.
-         */
-        if ((ecc_opt == OMAP_ECC_BCH4_CODE_HW_DETECTION_SW) &&
-            (!cpu_is_omap3630() || (GET_OMAP_REVISION() == 0)))
-                return 0;
-
         /* legacy platforms support only HAM1 (1-bit Hamming) ECC scheme */
         if (ecc_opt == OMAP_ECC_HAM1_CODE_HW)
                 return 1;