Hi Simon,
On Wed, Jul 8, 2020 at 3:13 AM Simon Glass sjg@chromium.org wrote:
Add a /chosen property to control the order in which the data appears in the SSDT. This allows matching up U-Boot's output from a dump of the known-good data obtained from within Linux.
Signed-off-by: Simon Glass sjg@chromium.org Reviewed-by: Wolfgang Wallner wolfgang.wallner@br-automation.com
Changes in v4:
- Explain in sort_acpi_item_type() why ctx->current is not updated
Changes in v3:
- Make find_item() static and rename to find_acpi_item()
- Rename build_type() and add a comment
Changes in v1:
- Generalise the ACPI function recursion with acpi_recurse_method()
arch/sandbox/dts/test.dts | 5 +- doc/device-tree-bindings/chosen.txt | 9 ++++ drivers/core/acpi.c | 84 +++++++++++++++++++++++++++++ test/dm/acpi.c | 15 +++--- 4 files changed, 105 insertions(+), 8 deletions(-)
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts index ea686f0cb3..6687efe2ae 100644 --- a/arch/sandbox/dts/test.dts +++ b/arch/sandbox/dts/test.dts @@ -254,7 +254,7 @@ compatible = "denx,u-boot-devres-test"; };
acpi-test {
acpi_test1: acpi-test { compatible = "denx,u-boot-acpi-test"; acpi-ssdt-test-data = "ab"; child {@@ -262,7 +262,7 @@ }; };
acpi-test2 {
acpi_test2: acpi-test2 { compatible = "denx,u-boot-acpi-test"; acpi-ssdt-test-data = "cd"; };@@ -904,6 +904,7 @@ setting = "sunrise ohoka"; other-node = "/some-bus/c-test@5"; int-values = <0x1937 72993>;
u-boot,acpi-ssdt-order = <&acpi_test2 &acpi_test1>; chosen-test { compatible = "denx,u-boot-fdt-test"; reg = <9 1>;diff --git a/doc/device-tree-bindings/chosen.txt b/doc/device-tree-bindings/chosen.txt index 395c9501e3..d4dfc05847 100644 --- a/doc/device-tree-bindings/chosen.txt +++ b/doc/device-tree-bindings/chosen.txt @@ -134,3 +134,12 @@ Example phandlepart = <&mmc 1>; }; };
+u-boot,acpi-ssdt-order +----------------------
+This provides the ordering to use when writing device data to the ACPI SSDT +(Secondary System Descriptor Table). Each cell is a phandle pointer to a device +node to add. The ACPI information is written in this order.
+If the ordering does not include all nodes, an error is generated. diff --git a/drivers/core/acpi.c b/drivers/core/acpi.c index df3d7ba417..a9b7fc1d9a 100644 --- a/drivers/core/acpi.c +++ b/drivers/core/acpi.c @@ -108,6 +108,85 @@ static int acpi_add_item(struct acpi_ctx *ctx, struct udevice *dev, return 0; }
+static struct acpi_item *find_acpi_item(const char *devname) +{
int i;for (i = 0; i < item_count; i++) {struct acpi_item *item = &acpi_item[i];if (!strcmp(devname, item->dev->name))return item;}return NULL;+}
+/**
- sort_acpi_item_type - Sort the ACPI items into the desired order
- This looks up the ordering in the device tree and then adds each item one by
- one into the supplied buffer
- @ctx: ACPI context
- @start: Start position to put the sorted items. The items will follow each
other in sorted order
- @type: Type of items to sort
- @return 0 if OK, -ve on error
- */
+static int sort_acpi_item_type(struct acpi_ctx *ctx, void *start,
enum gen_type_t type)+{
const u32 *order;int size;int count;void *ptr;void *end = ctx->current;ptr = start;order = ofnode_read_chosen_prop("u-boot,acpi-ssdt-order", &size);if (!order) {log_warning("Failed to find ordering, leaving as is\n");
This warning is showing 4 times when booting to U-Boot shell on Minnowmax. I think we should suppress it by default.
If you agree, please send a version of this patch only, so I can apply it in u-boot-x86.
return 0;}/** This algorithm rewrites the context buffer without changing its* length. So there is no need to update ctx-current*/
Regards, Bin