The first variants of Armada XP SoCs (A0 stepping) have issues related to the i2c controller which prevent to use the offload mechanism and lead to a kernel hang during boot.
This commit add quirk in the mvebu platform code to check the SoC version and then add the "offload-broken" property for the i2c controller according to the revision of the SoC. Signed-off-by: Gregory CLEMENT <[email protected]> --- arch/arm/mach-mvebu/armada-370-xp.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/arm/mach-mvebu/armada-370-xp.c b/arch/arm/mach-mvebu/armada-370-xp.c index e2acff98e750..c93ac68779e0 100644 --- a/arch/arm/mach-mvebu/armada-370-xp.c +++ b/arch/arm/mach-mvebu/armada-370-xp.c @@ -21,6 +21,7 @@ #include <linux/clocksource.h> #include <linux/dma-mapping.h> #include <linux/mbus.h> +#include <linux/mvebu-soc-id.h> #include <asm/hardware/cache-l2x0.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> @@ -45,8 +46,31 @@ static void __init armada_370_xp_timer_and_clk_init(void) #endif } +static struct property i2c_offload_broken = { + .name = "offload-broken", +}; + +static void __init i2c_quirk(void) +{ + struct device_node *np; + u32 dev, rev; + + /* + * Only revisons more recent than A0 support the offload + * mechanism. We can exit only if we are sure that we can + * get the SoC revision and it is more recent than A0. + */ + if (mvebu_get_soc_id(&rev, &dev) == 0 && dev > MV78XX0_A0_REV) + return; + + for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") + of_add_property(np, &i2c_offload_broken); + return; +} + static void __init armada_370_xp_dt_init(void) { + i2c_quirk(); of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); } -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
