irqchip/gic-v3: Disable pseudo NMIs on Mediatek devices w/ firmware issues

[linux-2.6-block.git] / drivers / irqchip / irq-gic-v3.c

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 6fcee221f201720929f1481aa64d3367d6395737..a605aa79435a4dca64dd1eb012f0f1fe7f394ff3 100644 (file)
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -39,6 +39,7 @@
 
 #define FLAGS_WORKAROUND_GICR_WAKER_MSM8996    (1ULL << 0)
 #define FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539  (1ULL << 1)
+#define FLAGS_WORKAROUND_MTK_GICR_SAVE         (1ULL << 2)
 
 #define GIC_IRQ_TYPE_PARTITION (GIC_IRQ_TYPE_LPI + 1)
 
@@ -1720,6 +1721,15 @@ static bool gic_enable_quirk_msm8996(void *data)
        return true;
 }
 
+static bool gic_enable_quirk_mtk_gicr(void *data)
+{
+       struct gic_chip_data *d = data;
+
+       d->flags |= FLAGS_WORKAROUND_MTK_GICR_SAVE;
+
+       return true;
+}
+
 static bool gic_enable_quirk_cavium_38539(void *data)
 {
        struct gic_chip_data *d = data;
@@ -1792,6 +1802,11 @@ static const struct gic_quirk gic_quirks[] = {
                .compatible = "qcom,msm8996-gic-v3",
                .init   = gic_enable_quirk_msm8996,
        },
+       {
+               .desc   = "GICv3: Mediatek Chromebook GICR save problem",
+               .property = "mediatek,broken-save-restore-fw",
+               .init   = gic_enable_quirk_mtk_gicr,
+       },
        {
                .desc   = "GICv3: HIP06 erratum 161010803",
                .iidr   = 0x0204043b,
@@ -1834,6 +1849,11 @@ static void gic_enable_nmi_support(void)
        if (!gic_prio_masking_enabled())
                return;
 
+       if (gic_data.flags & FLAGS_WORKAROUND_MTK_GICR_SAVE) {
+               pr_warn("Skipping NMI enable due to firmware issues\n");
+               return;
+       }
+
        ppi_nmi_refs = kcalloc(gic_data.ppi_nr, sizeof(*ppi_nmi_refs), GFP_KERNEL);
        if (!ppi_nmi_refs)
                return;