linux-kernel - Re: [PATCH] phy: freescale: fsl-samsung-hdmi: fix build error in fsl_samsung_hdmi_phy_configure_pll_lock

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Message-ID: <CAHCN7x+UzXQz+2zs+qvvWfWCmhsxsZoxP+2WHpfdZGnzwDPNQg@mail.gmail.com>
Date: Mon, 30 Dec 2024 20:11:16 -0600
From: Adam Ford <aford173@...il.com>
To: Pei Xiao <xiaopei01@...inos.cn>
Cc: geert@...ux-m68k.org, aford@...conembedded.com, arnd@...db.de, 
	dominique.martinet@...ark-techno.com, frieder.schrempf@...tron.de, 
	kishon@...nel.org, l.stach@...gutronix.de, linux-kernel@...r.kernel.org, 
	linux-phy@...ts.infradead.org, m.felsch@...gutronix.de, sandor.yu@....com, 
	u.kleine-koenig@...libre.com, vkoul@...nel.org
Subject: Re: [PATCH] phy: freescale: fsl-samsung-hdmi: fix build error in fsl_samsung_hdmi_phy_configure_pll_lock_det

On Sun, Dec 29, 2024 at 8:11 PM Pei Xiao <xiaopei01@...inos.cn> wrote:
>
> FIELD_PREP() checks that a constant fits into the available bitfield,
> but the index div equals to 4,is out of range, which gcc
> correctly complains about:
>
> In function ‘fsl_samsung_hdmi_phy_configure_pll_lock_det’,
> inlined from ‘fsl_samsung_hdmi_phy_configure’ at
> drivers/phy/freescale/phy-fsl-samsung-hdmi.c :470:2:
> ././include/linux/compiler_types.h:542:38: error: call to ‘__compiletime_assert_538’
> declared with attribute error: FIELD_PREP: value too large for the field
>   542 |  _compiletime_assert(condition, msg, __compiletime_assert_,
> __COUNTER__)
>       |                                      ^
> ././include/linux/compiler_types.h:523:4: note: in definition of
> macro ‘__compiletime_assert’ 523 |    prefix ## suffix();
>       |    ^~~~~~
> ././include/linux/compiler_types.h:542:2: note: in expansion of macro
> ‘_compiletime_assert’
>   542 |  _compiletime_assert(condition, msg, __compiletime_assert_,
>  __COUNTER__)
>
> Rework this so the field value which is restricted to the range of 0 to 3,
> so build error will fix.
>
> Fixes: d567679f2b6a ("phy: freescale: fsl-samsung-hdmi: Clean up fld_tg_code calculation")
> Signed-off-by: Pei Xiao <xiaopei01@...inos.cn>
> ---
>  drivers/phy/freescale/phy-fsl-samsung-hdmi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/phy/freescale/phy-fsl-samsung-hdmi.c b/drivers/phy/freescale/phy-fsl-samsung-hdmi.c
> index 5eac70a1e858..3e4d1a5160ea 100644
> --- a/drivers/phy/freescale/phy-fsl-samsung-hdmi.c
> +++ b/drivers/phy/freescale/phy-fsl-samsung-hdmi.c
> @@ -341,7 +341,7 @@ fsl_samsung_hdmi_phy_configure_pll_lock_det(struct fsl_samsung_hdmi_phy *phy,
>                         break;
>         }
>
> -       writeb(FIELD_PREP(REG12_CK_DIV_MASK, div), phy->regs + PHY_REG(12));
> +       writeb(FIELD_PREP(REG12_CK_DIV_MASK, div == 4 ? div - 1 : div), phy->regs + PHY_REG(12));

The for-loop above this line states:   for (div = 0; div < 4; div++)
How could this ever reach 4?  If it did reach 4, the calculation for
int_pllclk would need to be recalculated since int_pllclk = pclk / (1
<< div);

adam
>         /*
>          * Calculation for the frequency lock detector target code (fld_tg_code)
> --
> 2.25.1
>