From: Pierre-Louis Bossart Date: Tue, 26 Mar 2024 09:01:20 +0000 (+0000) Subject: soundwire: clarify maximum allowed address X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=bc13cf3f6e63dd708ccd160a28e6bb696af7e9f6;p=linux.git soundwire: clarify maximum allowed address 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 Reviewed-by: Rander Wang Signed-off-by: Bard Liao Link: https://lore.kernel.org/r/20240326090122.1051806-6-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul --- diff --git a/include/linux/soundwire/sdw_registers.h b/include/linux/soundwire/sdw_registers.h index 138bec908c40c..658b10fa5b20a 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