This is a note to let you know that I've just added the patch titled
soundwire: intel_ace2x: fix AC timing setting for ACE2.x
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
soundwire-intel_ace2x-fix-ac-timing-setting-for-ace2.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b35ca5facae65e4708b0b11ecf04eeb406f57d03
Author: Chao Song <chao.song@xxxxxxxxxxxxxxx>
Date: Mon Nov 27 20:47:35 2023 +0800
soundwire: intel_ace2x: fix AC timing setting for ACE2.x
[ Upstream commit 393cae5f32d640b9798903702018a48c7a45e59f ]
Start from ACE1.x, DOAISE is added to AC timing control
register bit 5, it combines with DOAIS to get effective
timing, and has the default value 1.
The current code fills DOAIS, DACTQE and DODS bits to a
variable initialized to zero, and updates the variable
to AC timing control register. With this operation, We
change DOAISE to 0, and force a much more aggressive
timing. The timing is even unable to form a working
waveform on SDA pin.
This patch uses read-modify-write operation for the AC
timing control register access, thus makes sure those
bits not supposed and intended to change are not touched.
Signed-off-by: Chao Song <chao.song@xxxxxxxxxxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Signed-off-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231127124735.2080562-1-yung-chuan.liao@xxxxxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/soundwire/intel_ace2x.c b/drivers/soundwire/intel_ace2x.c
index a9d25ae0b73f..e320c9128913 100644
--- a/drivers/soundwire/intel_ace2x.c
+++ b/drivers/soundwire/intel_ace2x.c
@@ -23,8 +23,9 @@
static void intel_shim_vs_init(struct sdw_intel *sdw)
{
void __iomem *shim_vs = sdw->link_res->shim_vs;
- u16 act = 0;
+ u16 act;
+ act = intel_readw(shim_vs, SDW_SHIM2_INTEL_VS_ACTMCTL);
u16p_replace_bits(&act, 0x1, SDW_SHIM2_INTEL_VS_ACTMCTL_DOAIS);
act |= SDW_SHIM2_INTEL_VS_ACTMCTL_DACTQE;
act |= SDW_SHIM2_INTEL_VS_ACTMCTL_DODS;
