Messages in this thread Patch in this message | | | From | Robert Richter <> | Subject | [PATCH 3/4] arm64: gicv3: its: Read typer register outside the loop | Date | Sun, 3 May 2015 22:49:31 +0200 |
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From: Robert Richter <rrichter@cavium.com>
No need to read the typer register in the loop. Values do not change.
Signed-off-by: Robert Richter <rrichter@cavium.com> --- drivers/irqchip/irq-gic-v3-its.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index a2619a1d5bb3..916c4724c771 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -803,6 +803,8 @@ static int its_alloc_tables(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); @@ -826,9 +828,6 @@ static int its_alloc_tables(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 = get_order((1UL << ids) * entry_size); if (order >= MAX_ORDER) { order = MAX_ORDER - 1; -- 2.1.1
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