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| author | Marek Vasut <marek.vasut+renesas@mailbox.org> | 2026-07-07 22:35:42 +0200 |
|---|---|---|
| committer | Manivannan Sadhasivam <mani@kernel.org> | 2026-07-15 16:01:59 +0200 |
| commit | a8818827486cd303f63be6ceadd949f64665938f (patch) | |
| tree | 77e80bd083c704b8be82b8b3fd0270aabf8aa0c0 /drivers | |
| parent | ee83126141801f5109b6ea39afe64f7c9a29015a (diff) | |
| download | linux-next-a8818827486cd303f63be6ceadd949f64665938f.tar.gz linux-next-a8818827486cd303f63be6ceadd949f64665938f.zip | |
irqchip/gic-v3: Add Renesas R-Car Gen4 erratum workaround
Renesas R-Car S4/V4H/V4M GIC600 integration has address width for AXI
or APB interface configured to 32 bit, it can therefore access only
the first 4 GiB of physical address space. This information comes from
R-Car V4H Interface Specification sheet; there is currently no technical
update number assigned to this limitation. Further input from hardware
engineer indicates that this limitation also applies to R-Car S4 and V4M.
Name the limitation GEN4GICITS1, and add a driver quirk to mitigate this
limitation.
The quirk is keyed on the combination of the GIC implementation
and the platform identification in the device tree.
Co-developed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Acked-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260707203743.88299-5-marek.vasut+renesas@mailbox.org
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 6409d37d7871..fdc693602b4e 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -4891,6 +4891,11 @@ static bool __maybe_unused its_enable_quirk_hip09_162100801(void *data) } static const char * const dma_32bit_impaired_platforms[] = { +#ifdef CONFIG_RENESAS_ERRATUM_GEN4GICITS1 + "renesas,r8a779f0", + "renesas,r8a779g0", + "renesas,r8a779h0", +#endif #ifdef CONFIG_ROCKCHIP_ERRATUM_3568002 "rockchip,rk3566", "rockchip,rk3568", |