[PATCH v1 1/4] irqchip/gic-v3: Add Rockchip 3568002 erratum workaround

[Dmitry Osipenko <dmitry.osipenko@collabora.com>]

Rockchip RK3566/RK3568 GIC600 integration has DDR addressing
limited to first 4GB of DRAM. Rockchip assigned Erratum ID #3568002
for this issue. Add driver quirk for this Rockchip GIC Erratum.

Note, that the 0x0201743b ID is not Rockchip 356x specific and thus
there is an extra of_machine_is_compatible() check. Rockchip 3588 uses
same ID and it is not affected by this errata.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 Documentation/arch/arm64/silicon-errata.rst |  2 ++
 arch/arm64/Kconfig                          |  9 ++++++++
 drivers/irqchip/irq-gic-v3-its.c            | 23 ++++++++++++++++++++-
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/Documentation/arch/arm64/silicon-errata.rst b/Documentation/arch/arm64/silicon-errata.rst
index f074f6219f5c..f968c13b46a7 100644
--- a/Documentation/arch/arm64/silicon-errata.rst
+++ b/Documentation/arch/arm64/silicon-errata.rst
@@ -284,6 +284,8 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | Rockchip       | RK3588          | #3588001        | ROCKCHIP_ERRATUM_3588001    |
 +----------------+-----------------+-----------------+-----------------------------+
+| Rockchip       | RK3568          | #3568002        | ROCKCHIP_ERRATUM_3568002    |
++----------------+-----------------+-----------------+-----------------------------+
 +----------------+-----------------+-----------------+-----------------------------+
 | Fujitsu        | A64FX           | E#010001        | FUJITSU_ERRATUM_010001      |
 +----------------+-----------------+-----------------+-----------------------------+
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c997b27b7da1..0428ad8f324d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1302,6 +1302,15 @@ config NVIDIA_CARMEL_CNP_ERRATUM
 
 	  If unsure, say Y.
 
+config ROCKCHIP_ERRATUM_3568002
+	bool "Rockchip 3568002: can not support DDR addresses higher than 4G"
+	default y
+	help
+	  The Rockchip RK3566 and RK3568 GIC600 SoC integrations have DDR
+	  addressing limited to first 4GB.
+
+	  If unsure, say Y.
+
 config ROCKCHIP_ERRATUM_3588001
 	bool "Rockchip 3588001: GIC600 can not support shareability attributes"
 	default y
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 8c3ec5734f1e..f30ed281882f 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -205,13 +205,15 @@ static DEFINE_IDA(its_vpeid_ida);
 #define gic_data_rdist_rd_base()	(gic_data_rdist()->rd_base)
 #define gic_data_rdist_vlpi_base()	(gic_data_rdist_rd_base() + SZ_128K)
 
+static gfp_t gfp_flags_quirk;
+
 static struct page *its_alloc_pages_node(int node, gfp_t gfp,
 					 unsigned int order)
 {
 	struct page *page;
 	int ret = 0;
 
-	page = alloc_pages_node(node, gfp, order);
+	page = alloc_pages_node(node, gfp | gfp_flags_quirk, order);
 
 	if (!page)
 		return NULL;
@@ -4887,6 +4889,17 @@ static bool __maybe_unused its_enable_quirk_hip09_162100801(void *data)
 	return true;
 }
 
+static bool __maybe_unused its_enable_rk3568002(void *data)
+{
+	if (!of_machine_is_compatible("rockchip,rk3566") &&
+	    !of_machine_is_compatible("rockchip,rk3568"))
+		return false;
+
+	gfp_flags_quirk |= GFP_DMA32;
+
+	return true;
+}
+
 static const struct gic_quirk its_quirks[] = {
 #ifdef CONFIG_CAVIUM_ERRATUM_22375
 	{
@@ -4954,6 +4967,14 @@ static const struct gic_quirk its_quirks[] = {
 		.property = "dma-noncoherent",
 		.init   = its_set_non_coherent,
 	},
+#ifdef CONFIG_ROCKCHIP_ERRATUM_3568002
+	{
+		.desc   = "ITS: Rockchip erratum RK3568002",
+		.iidr   = 0x0201743b,
+		.mask   = 0xffffffff,
+		.init   = its_enable_rk3568002,
+	},
+#endif
 	{
 	}
 };
-- 
2.48.1