From: Robert Richter Date: Mon, 21 Sep 2015 20:58:36 +0000 (+0200) Subject: irqchip/gicv3-its: Read typer register outside the loop X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c14e36733b8a63894db9ca0b486ce14299ef2fda;p=linux-beck.git irqchip/gicv3-its: Read typer register outside the loop No need to read the typer register in the loop. Values do not change. This patch is basically a prerequisite for a follow-on patch that adds errata code for Cavium ThunderX. It moves the calculation of the number of id entries to the beginning of the function close to other setup values that are needed to allocate the its table. Now we have a central location to modify the setup parameters and the errata code can be implemented in a single block. Signed-off-by: Robert Richter Acked-by: Marc Zyngier Acked-by: Catalin Marinas Cc: Tirumalesh Chalamarla Cc: linux-arm-kernel@lists.infradead.org Cc: Jason Cooper Link: http://lkml.kernel.org/r/1442869119-1814-4-git-send-email-rric@kernel.org Signed-off-by: Thomas Gleixner --- diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index d9052fdf98d7..549e71670f23 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -815,6 +815,8 @@ static int its_alloc_tables(const char *node_name, struct its_node *its) int psz = SZ_64K; u64 shr = GITS_BASER_InnerShareable; u64 cache = GITS_BASER_WaWb; + u64 typer = readq_relaxed(its->base + GITS_TYPER); + u32 ids = GITS_TYPER_DEVBITS(typer); for (i = 0; i < GITS_BASER_NR_REGS; i++) { u64 val = readq_relaxed(its->base + GITS_BASER + i * 8); @@ -838,9 +840,6 @@ static int its_alloc_tables(const char *node_name, struct its_node *its) * For other tables, only allocate a single page. */ if (type == GITS_BASER_TYPE_DEVICE) { - u64 typer = readq_relaxed(its->base + GITS_TYPER); - u32 ids = GITS_TYPER_DEVBITS(typer); - /* * 'order' was initialized earlier to the default page * granule of the the ITS. We can't have an allocation