[coreboot-gerrit] Patch set updated for coreboot: soc/broadwell/igd.c: limit max CD clock to 450MHz

[Matt DeVillier (matt.devillier@gmail.com)]

Matt DeVillier (matt.devillier at gmail.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17456

-gerrit

commit e56548e56f39347a97b2b18c7f2ef75248d425de
Author: Matt DeVillier <matt.devillier at gmail.com>
Date:   Wed Nov 16 23:37:43 2016 -0600

    soc/broadwell/igd.c: limit max CD clock to 450MHz
    
    limit the max CD clock frequency to 450MHz for ULT SoCs, as
    higher values result in HDMI audio speedup, failure to pass
    HD audio bitstreams, and other related issues under Windows
    (8/8.1/10).
    The Linux i915 driver already does this for Broadwell ULT,
    which is why it wasn't affected by the higher default in firmware.
    
    Change-Id: Ibf253f7ab3ba340b4ab6fd97225155ffb112d74d
    Signed-off-by: Matt DeVillier <matt.devillier at gmail.com>
---
 src/soc/intel/broadwell/igd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/soc/intel/broadwell/igd.c b/src/soc/intel/broadwell/igd.c
index ccb1e93..cb0ed11 100644
--- a/src/soc/intel/broadwell/igd.c
+++ b/src/soc/intel/broadwell/igd.c
@@ -421,9 +421,9 @@ static void igd_cdclk_init_broadwell(struct device *dev)
 			cdclk = GT_CDCLK_675;
 	}
 
-	/* CD clock frequency 675MHz not supported on ULT */
-	if (cpu_is_ult() && cdclk == GT_CDCLK_675)
-		cdclk = GT_CDCLK_540;
+	/* CD clock frequency 540/675MHz not supported on ULT */
+	if (cpu_is_ult() && cdclk > GT_CDCLK_450)
+		cdclk = GT_CDCLK_450;
 
 	/* Set variables based on CD Clock setting */
 	switch (cdclk) {