linux-kernel - [PATCH v2 1/3] soundwire: add override addr ops

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Date:   Tue,  2 Mar 2021 15:51:03 +0800
From:   Bard Liao <yung-chuan.liao@...ux.intel.com>
To:     alsa-devel@...a-project.org, vkoul@...nel.org
Cc:     vinod.koul@...aro.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, srinivas.kandagatla@...aro.org,
        rander.wang@...ux.intel.com, hui.wang@...onical.com,
        pierre-louis.bossart@...ux.intel.com, sanyog.r.kale@...el.com,
        bard.liao@...el.com
Subject: [PATCH v2 1/3] soundwire: add override addr ops

From: Vinod Koul <vkoul@...nel.org>

Platform firmware may have incorrect _ADR values causing the driver
probes to fail. Add the override_ops, which when configured will allow
for quirks based on DMI etc to override the addr values.

Co-developed-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Reviewed-by: Rander Wang <rander.wang@...el.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>
---
 drivers/soundwire/slave.c     | 8 +++++++-
 include/linux/soundwire/sdw.h | 4 +++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/soundwire/slave.c b/drivers/soundwire/slave.c
index 180f38bd003b..112b21967c7a 100644
--- a/drivers/soundwire/slave.c
+++ b/drivers/soundwire/slave.c
@@ -95,7 +95,7 @@ static bool find_slave(struct sdw_bus *bus,
 		       struct acpi_device *adev,
 		       struct sdw_slave_id *id)
 {
-	unsigned long long addr;
+	u64 addr;
 	unsigned int link_id;
 	acpi_status status;
 
@@ -108,6 +108,12 @@ static bool find_slave(struct sdw_bus *bus,
 		return false;
 	}
 
+	if (bus->ops->override_adr)
+		addr = bus->ops->override_adr(bus, addr);
+
+	if (!addr)
+		return false;
+
 	/* Extract link id from ADR, Bit 51 to 48 (included) */
 	link_id = SDW_DISCO_LINK_ID(addr);
 
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index d08039d65825..f0a3895e8faf 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -804,6 +804,7 @@ struct sdw_defer {
 /**
  * struct sdw_master_ops - Master driver ops
  * @read_prop: Read Master properties
+ * @override_adr: Override value read from firmware (quirk for buggy firmware)
  * @xfer_msg: Transfer message callback
  * @xfer_msg_defer: Defer version of transfer message callback
  * @reset_page_addr: Reset the SCP page address registers
@@ -813,7 +814,8 @@ struct sdw_defer {
  */
 struct sdw_master_ops {
 	int (*read_prop)(struct sdw_bus *bus);
-
+	u64 (*override_adr)
+			(struct sdw_bus *bus, u64 addr);
 	enum sdw_command_response (*xfer_msg)
 			(struct sdw_bus *bus, struct sdw_msg *msg);
 	enum sdw_command_response (*xfer_msg_defer)
-- 
2.17.1