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mach-snapdragon: fixup power-domains

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We don't support the RPM(h)PD power domains in U-Boot, and we don't need
to - the necessary resources are on, and we aren't going to enter any
low power modes.

We could try using a no-op device, but this requires adding a compatible
for every platform, and just pollutes the driver model. So instead let's
just remove every "power-domains" property that references the RPM(h)pd
power controller. This takes <1ms as we're using OF_LIVE.

Of note, this only applies to drivers which are loading post-relocation.
Drivers loaded pre-reloc that reference the rpm(h)pd still need
DM_FLAG_DEFAULT_PD_CTRL_OFF in their flags.

Acked-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Caleb Connolly
2024-04-03 14:07:46 +02:00
parent 06db7f962f
commit b2f2c7b526
1 changed files with 32 additions and 0 deletions
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32
arch/arm/mach-snapdragon/of_fixup.c
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@@ -22,6 +22,7 @@
#include <dm/of.h>
#include <fdt_support.h>
#include <linux/errno.h>
#include <stdlib.h>
#include <time.h>
/* U-Boot only supports USB high-speed mode on Qualcomm platforms with DWC3
@@ -110,6 +111,36 @@ static void fixup_usb_nodes(void)
}
}
/* Remove all references to the rpmhpd device */
static void fixup_power_domains(void)
{
struct device_node *pd = NULL, *np = NULL;
struct property *prop;
const __be32 *val;
/* All Qualcomm platforms name the rpm(h)pd "power-controller" */
for_each_of_allnodes(pd) {
if (pd->name && !strcmp("power-controller", pd->name))
break;
}
/* Sanity check that this is indeed a power domain controller */
if (!of_find_property(pd, "#power-domain-cells", NULL)) {
log_err("Found power-controller but it doesn't have #power-domain-cells\n");
return;
}
/* Remove all references to the power domain controller */
for_each_of_allnodes(np) {
if (!(prop = of_find_property(np, "power-domains", NULL)))
continue;
val = prop->value;
if (val[0] == cpu_to_fdt32(pd->phandle))
of_remove_property(np, prop);
}
}
#define time_call(func, ...) \
do { \
u64 start = timer_get_us(); \
@@ -120,4 +151,5 @@ static void fixup_usb_nodes(void)
void qcom_of_fixup_nodes(void)
{
time_call(fixup_usb_nodes);
time_call(fixup_power_domains);
}