From: Adam Ford Date: Sun, 4 May 2025 20:40:42 +0000 (-0500) Subject: phy: freescale: fsl-samsung-hdmi: Improve LUT search for best clock X-Git-Tag: v6.16-rc1~43^2~5 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=46a87260fc4f719f58e07a53cc1b70a38d98da37;p=thirdparty%2Fkernel%2Flinux.git phy: freescale: fsl-samsung-hdmi: Improve LUT search for best clock Searching the look-up-table runs so long as the frequency in the table is at or below the desired rate. This works well in most cases, but the next entry in the LUT might be closer to the nominal value than the lower one. Add some logic to check the higer value is any closer to the nominal value and use it. Signed-off-by: Adam Ford Link: https://lore.kernel.org/r/20250504204043.418924-3-aford173@gmail.com Signed-off-by: Vinod Koul --- diff --git a/drivers/phy/freescale/phy-fsl-samsung-hdmi.c b/drivers/phy/freescale/phy-fsl-samsung-hdmi.c index a081f07681db0..191c282246d96 100644 --- a/drivers/phy/freescale/phy-fsl-samsung-hdmi.c +++ b/drivers/phy/freescale/phy-fsl-samsung-hdmi.c @@ -510,7 +510,14 @@ static const struct phy_config *fsl_samsung_hdmi_phy_lookup_rate(unsigned long r if (phy_pll_cfg[i].pixclk <= rate) break; - return &phy_pll_cfg[i]; + /* If there is an exact match, or the array has been searched, return the value*/ + if (phy_pll_cfg[i].pixclk == rate || i + 1 > ARRAY_SIZE(phy_pll_cfg) - 1) + return &phy_pll_cfg[i]; + + /* See if the next entry is closer to nominal than this one */ + return (abs((long) rate - (long) phy_pll_cfg[i].pixclk) < + abs((long) rate - (long) phy_pll_cfg[i+1].pixclk) ? + &phy_pll_cfg[i] : &phy_pll_cfg[i+1]); } static void fsl_samsung_hdmi_calculate_phy(struct phy_config *cal_phy, unsigned long rate,