lkml.org 
[lkml]   [2015]   [May]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/4] arm64: gicv3: its: Read typer register outside the loop
Date
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


\
 
 \ /
  Last update: 2015-05-03 23:21    [W:0.119 / U:0.960 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site