github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-27 09:36:22 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

memory: tegra: Wire up system sleep PM ops

Browse Source 
The tegra-mc platform driver does not register any dev_pm_ops, so the
SoC-specific ->resume() is never invoked (e.g. tegra186_mc_resume) on
system wake. On Tegra186 and later this means MC client Stream-ID
override registers are not reprogrammed, and clients behind the ARM
SMMU fault on the first DMA after resume.

Register a dev_pm_ops on the tegra-mc driver and route the system
resume callback into mc->soc->ops->resume() so the existing SID
restore path runs again on wake.

No suspend callback is needed as the resume path reprograms all MC
state from the static SoC tables, so there is nothing to save.

Fixes: fe3b082a6e ("memory: tegra: Add SID override programming for MC clients")
Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://patch.msgid.link/20260430095202.1167651-3-amhetre@nvidia.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Ashish Mhetre 2026-04-30 09:52:01 +00:00 committed by Krzysztof Kozlowski
parent 4f42beeb97
commit 2411c8d1e3
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/memory/tegra/mc.c
View File

@ -13,6 +13,7 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/sort.h>
#include <linux/tegra-icc.h>
@ -1010,10 +1011,23 @@ static void tegra_mc_sync_state(struct device *dev)
icc_sync_state(dev);
}
static int tegra_mc_resume(struct device *dev)
{
struct tegra_mc *mc = dev_get_drvdata(dev);
if (mc->soc->ops && mc->soc->ops->resume)
mc->soc->ops->resume(mc);
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(tegra_mc_pm_ops, NULL, tegra_mc_resume);
static struct platform_driver tegra_mc_driver = {
.driver = {
.name = "tegra-mc",
.of_match_table = tegra_mc_of_match,
.pm = pm_sleep_ptr(&tegra_mc_pm_ops),
.suppress_bind_attrs = true,
.sync_state = tegra_mc_sync_state,
},