Re: [PATCH 2/2] phy: mediatek: hdmi: mt8195: fix wrong pll calculus
From: AngeloGioacchino Del Regno
Date: Fri Apr 14 2023 - 06:34:45 EST
Il 13/04/23 14:46, Guillaume Ranquet ha scritto:
The clock rate calculus in mtk_hdmi_pll_calc() was wrong when it has
been replaced by 'div_u64'.
Fix the issue by multiplying the values in the denominator instead of
dividing them.
Fixes: 45810d486bb44 ("phy: mediatek: add support for phy-mtk-hdmi-mt8195")
Signed-off-by: Guillaume Ranquet <granquet@xxxxxxxxxxxx>
---
drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
index e10da6c4147e..5e84b294a43e 100644
--- a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
+++ b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
@@ -271,7 +271,7 @@ static int mtk_hdmi_pll_calc(struct mtk_hdmi_phy *hdmi_phy, struct clk_hw *hw,
* [32,24] 9bit integer, [23,0]:24bit fraction
*/
pcw = div_u64(((u64)ns_hdmipll_ck) << PCW_DECIMAL_WIDTH,
- da_hdmitx21_ref_ck / PLL_FBKDIV_HS3);
+ da_hdmitx21_ref_ck * PLL_FBKDIV_HS3);
How did that even work?!?!?!? Because ... it worked, I did test it. Bah!
Luck was on your side :-P
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>