From: Dmitry Osipenko <digetx@gmail.com>
Date: Wed, 18 Dec 2019 21:23:01 +0300
Subject: soc/tegra: fuse: Cache values of straps and Chip ID registers
Git-commit: 221c057a84c4d13a2990d3f3ac59f2d6fe00d613
Patch-mainline: v5.6-rc1
References: jsc#SLE-15847
There is no need to re-read Chip ID and HW straps out from hardware each
time, it is a bit nicer to cache the values in memory.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/soc/tegra/fuse/tegra-apbmisc.c | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)
diff --git a/drivers/soc/tegra/fuse/tegra-apbmisc.c b/drivers/soc/tegra/fuse/tegra-apbmisc.c
index 6aa6c9877b41..984f42c80112 100644
--- a/drivers/soc/tegra/fuse/tegra-apbmisc.c
+++ b/drivers/soc/tegra/fuse/tegra-apbmisc.c
@@ -21,18 +21,15 @@
#define PMC_STRAPPING_OPT_A_RAM_CODE_MASK_SHORT \
(0x3 << PMC_STRAPPING_OPT_A_RAM_CODE_SHIFT)
-static void __iomem *apbmisc_base;
-static void __iomem *strapping_base;
static bool long_ram_code;
+static u32 strapping;
+static u32 chipid;
u32 tegra_read_chipid(void)
{
- if (!apbmisc_base) {
- WARN(1, "Tegra Chip ID not yet available\n");
- return 0;
- }
+ WARN(!chipid, "Tegra Chip ID not yet available\n");
- return readl_relaxed(apbmisc_base + 4);
+ return chipid;
}
u8 tegra_get_chip_id(void)
@@ -42,10 +39,7 @@ u8 tegra_get_chip_id(void)
u32 tegra_read_straps(void)
{
- if (strapping_base)
- return readl_relaxed(strapping_base);
- else
- return 0;
+ return strapping;
}
u32 tegra_read_ram_code(void)
@@ -104,6 +98,7 @@ void __init tegra_init_revision(void)
void __init tegra_init_apbmisc(void)
{
+ void __iomem *apbmisc_base, *strapping_base;
struct resource apbmisc, straps;
struct device_node *np;
@@ -163,10 +158,14 @@ void __init tegra_init_apbmisc(void)
apbmisc_base = ioremap_nocache(apbmisc.start, resource_size(&apbmisc));
if (!apbmisc_base)
pr_err("failed to map APBMISC registers\n");
+ else
+ chipid = readl_relaxed(apbmisc_base + 4);
strapping_base = ioremap_nocache(straps.start, resource_size(&straps));
if (!strapping_base)
pr_err("failed to map strapping options registers\n");
+ else
+ strapping = readl_relaxed(strapping_base);
long_ram_code = of_property_read_bool(np, "nvidia,long-ram-code");
}
--
2.26.2