From a19efb5265c3043f5598192a3493bc3c47a393c6 Mon Sep 17 00:00:00 2001
From: Bard Liao <yung-chuan.liao@linux.intel.com>
Date: Mon, 13 Jan 2020 17:11:29 -0600
Subject: [PATCH] soundwire: intel: fix factor of two in MCLK handling
Git-commit: a19efb5265c3043f5598192a3493bc3c47a393c6
Patch-mainline: v5.6-rc1
References: jsc#SLE-16518
Somehow Intel folks were confused, the property is 2x what the mclk
frequency actually is (checked the actual bus frequency with a scope)
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200113231129.19049-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/soundwire/intel.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 0371d3d5501a..06ef3a3ac080 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -880,6 +880,9 @@ static int sdw_master_read_intel_prop(struct sdw_bus *bus)
"intel-sdw-ip-clock",
&prop->mclk_freq);
+ /* the values reported by BIOS are the 2x clock, not the bus clock */
+ prop->mclk_freq /= 2;
+
fwnode_property_read_u32(link,
"intel-quirk-mask",
&quirk_mask);
--
2.16.4