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author | Álvaro Fernández Rojas <noltari@gmail.com> | 2021-02-18 18:04:33 +0100 |
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committer | Álvaro Fernández Rojas <noltari@gmail.com> | 2021-02-18 23:42:32 +0100 |
commit | f07e572f6447465d8938679533d604e402b0f066 (patch) | |
tree | cb333bd2a67e59e7c07659514850a0fd55fc825e /target/linux/bcm27xx/patches-5.4/950-0615-vc4_hdmi_phy-Fix-offset-calculation.patch | |
parent | 5d3a6fd970619dfc55f8259035c3027d7613a2a6 (diff) | |
download | upstream-f07e572f6447465d8938679533d604e402b0f066.tar.gz upstream-f07e572f6447465d8938679533d604e402b0f066.tar.bz2 upstream-f07e572f6447465d8938679533d604e402b0f066.zip |
bcm27xx: import latest patches from the RPi foundation
bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0615-vc4_hdmi_phy-Fix-offset-calculation.patch')
-rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0615-vc4_hdmi_phy-Fix-offset-calculation.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0615-vc4_hdmi_phy-Fix-offset-calculation.patch b/target/linux/bcm27xx/patches-5.4/950-0615-vc4_hdmi_phy-Fix-offset-calculation.patch new file mode 100644 index 0000000000..83d8d25e29 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0615-vc4_hdmi_phy-Fix-offset-calculation.patch @@ -0,0 +1,30 @@ +From 9da2d153eb010d3e92083c322e87de9ae066d93e Mon Sep 17 00:00:00 2001 +From: popcornmix <popcornmix@gmail.com> +Date: Thu, 2 Apr 2020 16:46:31 +0100 +Subject: [PATCH] vc4_hdmi_phy: Fix offset calculation + +The original firmware code worked with float and did + offset = ((vco_freq / fref * 2) * (1 << 22)); + offset >>= 2; + +In this code it's all integer so doing the integer divide before the shift loses lots of precision + +This fixes the issue of 1080p59.94 mode having 59.64 fps + +Signed-off-by: popcornmix <popcornmix@gmail.com> +--- + drivers/gpu/drm/vc4/vc4_hdmi_phy.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/drivers/gpu/drm/vc4/vc4_hdmi_phy.c ++++ b/drivers/gpu/drm/vc4/vc4_hdmi_phy.c +@@ -192,8 +192,8 @@ static u32 phy_get_rm_offset(unsigned lo + + /* RM offset is stored as 9.22 format */ + offset = vco_freq * 2; +- do_div(offset, fref); + offset = offset << 22; ++ do_div(offset, fref); + offset >>= 2; + + return offset; |