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arm64: zynqmp: Fix split mode reset functionality

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This patch fixes two issues in the set_r5_reset function.

1. When in split mode, the lpd_amba_rst bit should only be set when
both r5 cpu cores are in reset. Otherwise, if one r5 core is still
running, setting the lpd_amba_rst bit will cause an error for the
running core. The set_r5_reset function has been modified to check
if the other r5 core is still running before setting the lpd_amba_rst
bit.

2. The cpu_disable function was always assuming that the r5 cores
are in split mode when resetting either core 4 or 5. This is
incorrect for lockstep functionality. This patch adds a function
check_r5_mode to handle the cpu_disable function correctly for
the r5 cores by checking the mode and handling the reset appropriately.

Signed-off-by: Neal Frager <neal.frager@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/d99cbd7f2394ac055ef27457298f554ff0747ba7.1651648344.git.michal.simek@amd.com
This commit is contained in:
Neal Frager 2022-05-04 09:12:26 +02:00 committed by Michal Simek
parent 2946c551f1
commit 67bdaa0165
1 changed files with 25 additions and 6 deletions
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31
arch/arm/mach-zynqmp/mp.c
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@ -102,13 +102,21 @@ static void set_r5_reset(u32 nr, u8 mode)
u32 tmp;
tmp = readl(&crlapb_base->rst_lpd_top);
if (mode == LOCK || nr == ZYNQMP_CORE_RPU0)
tmp |= (ZYNQMP_CRLAPB_RST_LPD_AMBA_RST_MASK |
ZYNQMP_CRLAPB_RST_LPD_R50_RST_MASK);
if (mode == LOCK || nr == ZYNQMP_CORE_RPU1)
if (mode == LOCK) {
tmp |= (ZYNQMP_CRLAPB_RST_LPD_AMBA_RST_MASK |
ZYNQMP_CRLAPB_RST_LPD_R50_RST_MASK |
ZYNQMP_CRLAPB_RST_LPD_R51_RST_MASK);
} else {
if (nr == ZYNQMP_CORE_RPU0) {
tmp |= ZYNQMP_CRLAPB_RST_LPD_R50_RST_MASK;
if (tmp & ZYNQMP_CRLAPB_RST_LPD_R51_RST_MASK)
tmp |= ZYNQMP_CRLAPB_RST_LPD_AMBA_RST_MASK;
} else {
tmp |= ZYNQMP_CRLAPB_RST_LPD_R51_RST_MASK;
if (tmp & ZYNQMP_CRLAPB_RST_LPD_R50_RST_MASK)
tmp |= ZYNQMP_CRLAPB_RST_LPD_AMBA_RST_MASK;
}
}
writel(tmp, &crlapb_base->rst_lpd_top);
}
@ -142,6 +150,17 @@ static void enable_clock_r5(void)
udelay(0x500);
}
static int check_r5_mode(void)
{
u32 tmp;
tmp = readl(&rpu_base->rpu_glbl_ctrl);
if (tmp & ZYNQMP_RPU_GLBL_CTRL_SPLIT_LOCK_MASK)
return SPLIT;
return LOCK;
}
int cpu_disable(u32 nr)
{
if (nr >= ZYNQMP_CORE_APU0 && nr <= ZYNQMP_CORE_APU3) {
@ -149,7 +168,7 @@ int cpu_disable(u32 nr)
val |= 1 << nr;
writel(val, &crfapb_base->rst_fpd_apu);
} else {
set_r5_reset(nr, SPLIT);
set_r5_reset(nr, check_r5_mode());
}
return 0;