linux-kernel - [PATCH 5/7] soundwire: clarify maximum allowed address

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Date: Tue, 26 Mar 2024 09:01:20 +0000
From: Bard Liao <yung-chuan.liao@...ux.intel.com>
To: linux-sound@...r.kernel.org,
	vkoul@...nel.org
Cc: vinod.koul@...aro.org,
	linux-kernel@...r.kernel.org,
	pierre-louis.bossart@...ux.intel.com,
	bard.liao@...el.com
Subject: [PATCH 5/7] soundwire: clarify maximum allowed address

From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

The existing code sets the maximum address at 0x80000000, which is not
completely accurate. The last 2 Gbytes are indeed reserved, but so are
the 896 Mbytes just before. The maximum address which can be used with
paging or BRA is 0x47FFFFFF per Table 131 of the SoundWire 1.2.1
specification.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Rander Wang <rander.wang@...el.com>
Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
---
 include/linux/soundwire/sdw_registers.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/soundwire/sdw_registers.h b/include/linux/soundwire/sdw_registers.h
index 138bec908c40..658b10fa5b20 100644
--- a/include/linux/soundwire/sdw_registers.h
+++ b/include/linux/soundwire/sdw_registers.h
@@ -13,7 +13,7 @@
 
 #define SDW_REG_NO_PAGE				0x00008000
 #define SDW_REG_OPTIONAL_PAGE			0x00010000
-#define SDW_REG_MAX				0x80000000
+#define SDW_REG_MAX				0x48000000
 
 #define SDW_DPN_SIZE				0x100
 #define SDW_BANK1_OFFSET			0x10
-- 
2.34.1