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firmware: tf: Different way of L2 cache enabling after LP2 suspend 

ASUS TF300T device may not work properly if firmware is asked to fully
re-initialize L2 cache after resume from LP2 suspend. The downstream
kernel of TF300T uses different opcode to enable cache after resuming
from LP2, this opcode also works fine on Nexus 7 and Ouya devices.
Supposedly, this may be needed by an older firmware versions.

Reported-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Tested-by: Jasper Korten <jja2000@gmail.com>
Tested-by: David Heidelberg <david@ixit.cz>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2020-03-25 01:43:34 +03:00 committed by Thierry Reding
parent d70f5e541a
commit b720aaa347
2 changed files with 20 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/firmware/trusted_foundations.c
View File

@ -19,6 +19,7 @@
#define TF_CACHE_ENABLE 1
#define TF_CACHE_DISABLE 2
#define TF_CACHE_REENABLE 4
#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
@ -29,6 +30,7 @@
#define TF_CPU_PM_S1 0xffffffe4
#define TF_CPU_PM_S1_NOFLUSH_L2 0xffffffe7
static unsigned long tf_idle_mode = TF_PM_MODE_NONE;
static unsigned long cpu_boot_addr;
static void tf_generic_smc(u32 type, u32 arg1, u32 arg2)
@ -85,25 +87,40 @@ static int tf_prepare_idle(unsigned long mode)
cpu_boot_addr);
break;
case TF_PM_MODE_NONE:
break;
default:
return -EINVAL;
}
tf_idle_mode = mode;
return 0;
}
#ifdef CONFIG_CACHE_L2X0
static void tf_cache_write_sec(unsigned long val, unsigned int reg)
{
u32 l2x0_way_mask = 0xff;
u32 enable_op, l2x0_way_mask = 0xff;
switch (reg) {
case L2X0_CTRL:
if (l2x0_saved_regs.aux_ctrl & L310_AUX_CTRL_ASSOCIATIVITY_16)
l2x0_way_mask = 0xffff;
switch (tf_idle_mode) {
case TF_PM_MODE_LP2:
enable_op = TF_CACHE_REENABLE;
break;
default:
enable_op = TF_CACHE_ENABLE;
break;
}
if (val == L2X0_CTRL_EN)
tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_ENABLE,
tf_generic_smc(TF_CACHE_MAINT, enable_op,
l2x0_saved_regs.aux_ctrl);
else
tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_DISABLE,

1
include/linux/firmware/trusted_foundations.h
View File

@ -32,6 +32,7 @@
#define TF_PM_MODE_LP1_NO_MC_CLK 2
#define TF_PM_MODE_LP2 3
#define TF_PM_MODE_LP2_NOFLUSH_L2 4
#define TF_PM_MODE_NONE 5
struct trusted_foundations_platform_data {
unsigned int version_major;