linux-kernel - [PATCH v1 03/20] ACPICA: SPCR: Update the SPCR table to version 4

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Message-ID: <2203218.irdbgypaU6@rjwysocki.net>
Date: Thu, 29 Aug 2024 20:27:40 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux ACPI <linux-acpi@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Bob Moore <robert.moore@...el.com>,
 Saket Dumbre <saket.dumbre@...el.com>
Subject: [PATCH v1 03/20] ACPICA: SPCR: Update the SPCR table to version 4

From: Sia Jee Heng <jeeheng.sia@...rfivetech.com>

ACPICA commit 1eeff52124a45d5cd887ba5687bbad0116e4d211

The Microsoft Serial Port Console Redirection (SPCR) specification
revision 1.09 comprises additional fields [1]. The newly added fields
are:
- RISC-V SBI
- Precise Baud Rate
- namespace_string_length
- namespace_string_offset
- namespace_string

Additionaly, this code will support up to SPCR revision 1.10, as it
includes only minor wording changes.

Link: https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table # [1]
Link: https://github.com/acpica/acpica/commit/1eeff521
Signed-off-by: Sia Jee Heng <jeeheng.sia@...rfivetech.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 include/acpi/actbl3.h | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h
index 8f775e3a08fd..5cd755143b7d 100644
--- a/include/acpi/actbl3.h
+++ b/include/acpi/actbl3.h
@@ -92,10 +92,10 @@ struct acpi_table_slit {
 /*******************************************************************************
  *
  * SPCR - Serial Port Console Redirection table
- *        Version 2
+ *        Version 4
  *
  * Conforms to "Serial Port Console Redirection Table",
- * Version 1.03, August 10, 2015
+ * Version 1.10, Jan 5, 2023
  *
  ******************************************************************************/
 
@@ -112,7 +112,7 @@ struct acpi_table_spcr {
 	u8 stop_bits;
 	u8 flow_control;
 	u8 terminal_type;
-	u8 reserved1;
+	u8 language;
 	u16 pci_device_id;
 	u16 pci_vendor_id;
 	u8 pci_bus;
@@ -120,7 +120,11 @@ struct acpi_table_spcr {
 	u8 pci_function;
 	u32 pci_flags;
 	u8 pci_segment;
-	u32 reserved2;
+	u32 uart_clk_freq;
+	u32 precise_baudrate;
+	u16 name_space_string_length;
+	u16 name_space_string_offset;
+	char name_space_string[];
 };
 
 /* Masks for pci_flags field above */
-- 
2.43.0