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memory: tegra: Restore MC interrupt masks on resume

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The MC interrupt mask registers lose their state across Tegra low power
suspend state (aka. SC7). Without re-applying them on resume, MC
interrupts that were enabled at probe remain masked after wake, so any
post-resume MC error goes unreported.

Factor the existing intmask programming out of tegra_mc_probe() into
tegra_mc_setup_intmask() and reuse it from the system resume callback
so the mask state is restored on wake.

Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://patch.msgid.link/20260430095202.1167651-4-amhetre@nvidia.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Ashish Mhetre 2026-04-30 09:52:02 +00:00 committed by Krzysztof Kozlowski
parent 2411c8d1e3
commit 35934fd08d
1 changed files with 16 additions and 7 deletions
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23
drivers/memory/tegra/mc.c
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@ -911,6 +911,19 @@ static void tegra_mc_num_channel_enabled(struct tegra_mc *mc)
}
}
static void tegra_mc_setup_intmask(struct tegra_mc *mc)
{
unsigned int i;
for (i = 0; i < mc->soc->num_intmasks; i++) {
if (mc->soc->num_channels)
mc_ch_writel(mc, MC_BROADCAST_CHANNEL, mc->soc->intmasks[i].mask,
mc->soc->intmasks[i].reg);
else
mc_writel(mc, mc->soc->intmasks[i].mask, mc->soc->intmasks[i].reg);
}
}
static int tegra_mc_probe(struct platform_device *pdev)
{
struct tegra_mc *mc;
@ -971,13 +984,7 @@ static int tegra_mc_probe(struct platform_device *pdev)
}
}
for (i = 0; i < mc->soc->num_intmasks; i++) {
if (mc->soc->num_channels)
mc_ch_writel(mc, MC_BROADCAST_CHANNEL, mc->soc->intmasks[i].mask,
mc->soc->intmasks[i].reg);
else
mc_writel(mc, mc->soc->intmasks[i].mask, mc->soc->intmasks[i].reg);
}
tegra_mc_setup_intmask(mc);
}
if (mc->soc->reset_ops) {
@ -1018,6 +1025,8 @@ static int tegra_mc_resume(struct device *dev)
if (mc->soc->ops && mc->soc->ops->resume)
mc->soc->ops->resume(mc);
tegra_mc_setup_intmask(mc);
return 0;
}