| Message ID | 20220529071156.2511568-1-victor.liu@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | clk: imx: clk-fracn-gppll: Return rate in rate table properly in ->recalc_rate() | expand |
> Subject: [PATCH] clk: imx: clk-fracn-gppll: Return rate in rate table properly in > ->recalc_rate() > > The PLL parameters in rate table should be directly compared with those read > from PLL registers instead of the cooked ones. > > Fixes: 1b26cb8a77a4 ("clk: imx: support fracn gppll") > Cc: Abel Vesa <abel.vesa@nxp.com> > Cc: Michael Turquette <mturquette@baylibre.com> > Cc: Stephen Boyd <sboyd@kernel.org> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Sascha Hauer <s.hauer@pengutronix.de> > Cc: Pengutronix Kernel Team <kernel@pengutronix.de> > Cc: Fabio Estevam <festevam@gmail.com> > Cc: NXP Linux Team <linux-imx@nxp.com> > Cc: Peng Fan <peng.fan@nxp.com> > Signed-off-by: Liu Ying <victor.liu@nxp.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> > --- > drivers/clk/imx/clk-fracn-gppll.c | 24 +++++++++++++----------- > 1 file changed, 13 insertions(+), 11 deletions(-) > > diff --git a/drivers/clk/imx/clk-fracn-gppll.c b/drivers/clk/imx/clk-fracn-gppll.c > index 71c102d950ab..762b07dd5a6d 100644 > --- a/drivers/clk/imx/clk-fracn-gppll.c > +++ b/drivers/clk/imx/clk-fracn-gppll.c > @@ -131,18 +131,7 @@ static unsigned long > clk_fracn_gppll_recalc_rate(struct clk_hw *hw, unsigned lon > mfi = FIELD_GET(PLL_MFI_MASK, pll_div); > > rdiv = FIELD_GET(PLL_RDIV_MASK, pll_div); > - rdiv = rdiv + 1; > odiv = FIELD_GET(PLL_ODIV_MASK, pll_div); > - switch (odiv) { > - case 0: > - odiv = 2; > - break; > - case 1: > - odiv = 3; > - break; > - default: > - break; > - } > > /* > * Sometimes, the recalculated rate has deviation due to @@ -160,6 > +149,19 @@ static unsigned long clk_fracn_gppll_recalc_rate(struct clk_hw > *hw, unsigned lon > if (rate) > return (unsigned long)rate; > > + rdiv = rdiv + 1; > + > + switch (odiv) { > + case 0: > + odiv = 2; > + break; > + case 1: > + odiv = 3; > + break; > + default: > + break; > + } > + > /* Fvco = Fref * (MFI + MFN / MFD) */ > fvco = fvco * mfi * mfd + fvco * mfn; > do_div(fvco, mfd * rdiv * odiv); > -- > 2.25.1
> Subject: RE: [PATCH] clk: imx: clk-fracn-gppll: Return rate in rate table properly > in ->recalc_rate() > > > Subject: [PATCH] clk: imx: clk-fracn-gppll: Return rate in rate table > > properly in > > ->recalc_rate() > > > > The PLL parameters in rate table should be directly compared with > > those read from PLL registers instead of the cooked ones. > > > > Fixes: 1b26cb8a77a4 ("clk: imx: support fracn gppll") > > Cc: Abel Vesa <abel.vesa@nxp.com> > > Cc: Michael Turquette <mturquette@baylibre.com> > > Cc: Stephen Boyd <sboyd@kernel.org> > > Cc: Shawn Guo <shawnguo@kernel.org> > > Cc: Sascha Hauer <s.hauer@pengutronix.de> > > Cc: Pengutronix Kernel Team <kernel@pengutronix.de> > > Cc: Fabio Estevam <festevam@gmail.com> > > Cc: NXP Linux Team <linux-imx@nxp.com> > > Cc: Peng Fan <peng.fan@nxp.com> > > Signed-off-by: Liu Ying <victor.liu@nxp.com> > > Reviewed-by: Peng Fan <peng.fan@nxp.com> > > > --- > > drivers/clk/imx/clk-fracn-gppll.c | 24 +++++++++++++----------- > > 1 file changed, 13 insertions(+), 11 deletions(-) > > > > diff --git a/drivers/clk/imx/clk-fracn-gppll.c > > b/drivers/clk/imx/clk-fracn-gppll.c > > index 71c102d950ab..762b07dd5a6d 100644 > > --- a/drivers/clk/imx/clk-fracn-gppll.c > > +++ b/drivers/clk/imx/clk-fracn-gppll.c > > @@ -131,18 +131,7 @@ static unsigned long > > clk_fracn_gppll_recalc_rate(struct clk_hw *hw, unsigned lon > > mfi = FIELD_GET(PLL_MFI_MASK, pll_div); > > > > rdiv = FIELD_GET(PLL_RDIV_MASK, pll_div); > > - rdiv = rdiv + 1; > > odiv = FIELD_GET(PLL_ODIV_MASK, pll_div); > > - switch (odiv) { > > - case 0: > > - odiv = 2; > > - break; > > - case 1: > > - odiv = 3; > > - break; > > - default: > > - break; > > - } > > > > /* > > * Sometimes, the recalculated rate has deviation due to @@ -160,6 > > +149,19 @@ static unsigned long clk_fracn_gppll_recalc_rate(struct > > +clk_hw > > *hw, unsigned lon > > if (rate) > > return (unsigned long)rate; > > > > + rdiv = rdiv + 1; After check more: According to doc, needs add a check here: if (!rdiv) rdiv = rdiv + 1; Regards, Peng. > > + > > + switch (odiv) { > > + case 0: > > + odiv = 2; > > + break; > > + case 1: > > + odiv = 3; > > + break; > > + default: > > + break; > > + } > > + > > /* Fvco = Fref * (MFI + MFN / MFD) */ > > fvco = fvco * mfi * mfd + fvco * mfn; > > do_div(fvco, mfd * rdiv * odiv); > > -- > > 2.25.1
Hi Peng, On Mon, 2022-05-30 at 17:08 +0800, Peng Fan wrote: > > Subject: RE: [PATCH] clk: imx: clk-fracn-gppll: Return rate in rate > > table properly > > in ->recalc_rate() > > > > > Subject: [PATCH] clk: imx: clk-fracn-gppll: Return rate in rate > > > table > > > properly in > > > ->recalc_rate() > > > > > > The PLL parameters in rate table should be directly compared with > > > those read from PLL registers instead of the cooked ones. > > > > > > Fixes: 1b26cb8a77a4 ("clk: imx: support fracn gppll") > > > Cc: Abel Vesa <abel.vesa@nxp.com> > > > Cc: Michael Turquette <mturquette@baylibre.com> > > > Cc: Stephen Boyd <sboyd@kernel.org> > > > Cc: Shawn Guo <shawnguo@kernel.org> > > > Cc: Sascha Hauer <s.hauer@pengutronix.de> > > > Cc: Pengutronix Kernel Team <kernel@pengutronix.de> > > > Cc: Fabio Estevam <festevam@gmail.com> > > > Cc: NXP Linux Team <linux-imx@nxp.com> > > > Cc: Peng Fan <peng.fan@nxp.com> > > > Signed-off-by: Liu Ying <victor.liu@nxp.com> > > > > Reviewed-by: Peng Fan <peng.fan@nxp.com> > > > > > --- > > > drivers/clk/imx/clk-fracn-gppll.c | 24 +++++++++++++----------- > > > 1 file changed, 13 insertions(+), 11 deletions(-) > > > > > > diff --git a/drivers/clk/imx/clk-fracn-gppll.c > > > b/drivers/clk/imx/clk-fracn-gppll.c > > > index 71c102d950ab..762b07dd5a6d 100644 > > > --- a/drivers/clk/imx/clk-fracn-gppll.c > > > +++ b/drivers/clk/imx/clk-fracn-gppll.c > > > @@ -131,18 +131,7 @@ static unsigned long > > > clk_fracn_gppll_recalc_rate(struct clk_hw *hw, unsigned lon > > > mfi = FIELD_GET(PLL_MFI_MASK, pll_div); > > > > > > rdiv = FIELD_GET(PLL_RDIV_MASK, pll_div); > > > - rdiv = rdiv + 1; > > > odiv = FIELD_GET(PLL_ODIV_MASK, pll_div); > > > - switch (odiv) { > > > - case 0: > > > - odiv = 2; > > > - break; > > > - case 1: > > > - odiv = 3; > > > - break; > > > - default: > > > - break; > > > - } > > > > > > /* > > > * Sometimes, the recalculated rate has deviation due to @@ > > > -160,6 > > > +149,19 @@ static unsigned long > > > clk_fracn_gppll_recalc_rate(struct > > > +clk_hw > > > *hw, unsigned lon > > > if (rate) > > > return (unsigned long)rate; > > > > > > + rdiv = rdiv + 1; > > After check more: > According to doc, needs add a check here: > if (!rdiv) > rdiv = rdiv + 1; This new check is not something this patch tries to deal with. Maybe, you may send a separate patch to add the check. Regards, Liu Ying > > Regards, > Peng. > > > + > > > + switch (odiv) { > > > + case 0: > > > + odiv = 2; > > > + break; > > > + case 1: > > > + odiv = 3; > > > + break; > > > + default: > > > + break; > > > + } > > > + > > > /* Fvco = Fref * (MFI + MFN / MFD) */ > > > fvco = fvco * mfi * mfd + fvco * mfn; > > > do_div(fvco, mfd * rdiv * odiv); > > > -- > > > 2.25.1 > >
diff --git a/drivers/clk/imx/clk-fracn-gppll.c b/drivers/clk/imx/clk-fracn-gppll.c index 71c102d950ab..762b07dd5a6d 100644 --- a/drivers/clk/imx/clk-fracn-gppll.c +++ b/drivers/clk/imx/clk-fracn-gppll.c @@ -131,18 +131,7 @@ static unsigned long clk_fracn_gppll_recalc_rate(struct clk_hw *hw, unsigned lon mfi = FIELD_GET(PLL_MFI_MASK, pll_div); rdiv = FIELD_GET(PLL_RDIV_MASK, pll_div); - rdiv = rdiv + 1; odiv = FIELD_GET(PLL_ODIV_MASK, pll_div); - switch (odiv) { - case 0: - odiv = 2; - break; - case 1: - odiv = 3; - break; - default: - break; - } /* * Sometimes, the recalculated rate has deviation due to @@ -160,6 +149,19 @@ static unsigned long clk_fracn_gppll_recalc_rate(struct clk_hw *hw, unsigned lon if (rate) return (unsigned long)rate; + rdiv = rdiv + 1; + + switch (odiv) { + case 0: + odiv = 2; + break; + case 1: + odiv = 3; + break; + default: + break; + } + /* Fvco = Fref * (MFI + MFN / MFD) */ fvco = fvco * mfi * mfd + fvco * mfn; do_div(fvco, mfd * rdiv * odiv);
The PLL parameters in rate table should be directly compared with those read from PLL registers instead of the cooked ones. Fixes: 1b26cb8a77a4 ("clk: imx: support fracn gppll") Cc: Abel Vesa <abel.vesa@nxp.com> Cc: Michael Turquette <mturquette@baylibre.com> Cc: Stephen Boyd <sboyd@kernel.org> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Pengutronix Kernel Team <kernel@pengutronix.de> Cc: Fabio Estevam <festevam@gmail.com> Cc: NXP Linux Team <linux-imx@nxp.com> Cc: Peng Fan <peng.fan@nxp.com> Signed-off-by: Liu Ying <victor.liu@nxp.com> --- drivers/clk/imx/clk-fracn-gppll.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-)