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From: Matthias Brugger <matthias.bgg@gmail.com>
To: Tom Rix <trix@redhat.com>,
	chunkuang.hu@kernel.org, p.zabel@pengutronix.de,
	chunfeng.yun@mediatek.com, vkoul@kernel.org, kishon@kernel.org,
	angelogioacchino.delregno@collabora.com
Cc: dri-devel@lists.freedesktop.org,
	linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] phy: mediatek: rework the floating point comparisons to fixed point
Date: Mon, 8 May 2023 10:57:55 +0200	[thread overview]
Message-ID: <0cdd2d49-a2a0-4968-a978-3c3caa5741f8@gmail.com> (raw)
In-Reply-To: <20230502145005.2927101-1-trix@redhat.com>



On 02/05/2023 16:50, Tom Rix wrote:
> gcc on aarch64 reports
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c: In function ‘mtk_hdmi_pll_set_rate’:
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c:240:52: error: ‘-mgeneral-regs-only’
>    is incompatible with the use of floating-point types
>    240 |         else if (tmds_clk >= 54 * MEGA && tmds_clk < 148.35 * MEGA)
> 
> Floating point should not be used, so rework the floating point comparisons
> to fixed point.
> 
> Signed-off-by: Tom Rix <trix@redhat.com>

I think this is worth a fixes tag.

Regards,
Matthias

> ---
> v2: silence robot by casting types to u64
> 
> ---
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> index abfc077fb0a8..093c4d1da557 100644
> --- a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> +++ b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> @@ -237,11 +237,11 @@ static int mtk_hdmi_pll_calc(struct mtk_hdmi_phy *hdmi_phy, struct clk_hw *hw,
>   	 */
>   	if (tmds_clk < 54 * MEGA)
>   		txposdiv = 8;
> -	else if (tmds_clk >= 54 * MEGA && tmds_clk < 148.35 * MEGA)
> +	else if (tmds_clk >= 54 * MEGA && (tmds_clk * 100) < 14835 * MEGA)
>   		txposdiv = 4;
> -	else if (tmds_clk >= 148.35 * MEGA && tmds_clk < 296.7 * MEGA)
> +	else if ((tmds_clk * 100) >= 14835 * MEGA && (tmds_clk * 10) < 2967 * MEGA)
>   		txposdiv = 2;
> -	else if (tmds_clk >= 296.7 * MEGA && tmds_clk <= 594 * MEGA)
> +	else if ((tmds_clk * 10) >= 2967 * MEGA && tmds_clk <= 594 * MEGA)
>   		txposdiv = 1;
>   	else
>   		return -EINVAL;
> @@ -328,12 +328,12 @@ static int mtk_hdmi_pll_drv_setting(struct clk_hw *hw)
>   		clk_channel_bias = 0x34; /* 20mA */
>   		impedance_en = 0xf;
>   		impedance = 0x36; /* 100ohm */
> -	} else if (pixel_clk >= 74.175 * MEGA && pixel_clk <= 300 * MEGA) {
> +	} else if (((u64)pixel_clk * 1000) >= 74175 * MEGA && pixel_clk <= 300 * MEGA) {
>   		data_channel_bias = 0x34; /* 20mA */
>   		clk_channel_bias = 0x2c; /* 16mA */
>   		impedance_en = 0xf;
>   		impedance = 0x36; /* 100ohm */
> -	} else if (pixel_clk >= 27 * MEGA && pixel_clk < 74.175 * MEGA) {
> +	} else if (pixel_clk >= 27 * MEGA && ((u64)pixel_clk * 1000) < 74175 * MEGA) {
>   		data_channel_bias = 0x14; /* 10mA */
>   		clk_channel_bias = 0x14; /* 10mA */
>   		impedance_en = 0x0;


WARNING: multiple messages have this Message-ID (diff)
From: Matthias Brugger <matthias.bgg@gmail.com>
To: Tom Rix <trix@redhat.com>,
	chunkuang.hu@kernel.org, p.zabel@pengutronix.de,
	chunfeng.yun@mediatek.com, vkoul@kernel.org, kishon@kernel.org,
	angelogioacchino.delregno@collabora.com
Cc: dri-devel@lists.freedesktop.org,
	linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] phy: mediatek: rework the floating point comparisons to fixed point
Date: Mon, 8 May 2023 10:57:55 +0200	[thread overview]
Message-ID: <0cdd2d49-a2a0-4968-a978-3c3caa5741f8@gmail.com> (raw)
In-Reply-To: <20230502145005.2927101-1-trix@redhat.com>



On 02/05/2023 16:50, Tom Rix wrote:
> gcc on aarch64 reports
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c: In function ‘mtk_hdmi_pll_set_rate’:
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c:240:52: error: ‘-mgeneral-regs-only’
>    is incompatible with the use of floating-point types
>    240 |         else if (tmds_clk >= 54 * MEGA && tmds_clk < 148.35 * MEGA)
> 
> Floating point should not be used, so rework the floating point comparisons
> to fixed point.
> 
> Signed-off-by: Tom Rix <trix@redhat.com>

I think this is worth a fixes tag.

Regards,
Matthias

> ---
> v2: silence robot by casting types to u64
> 
> ---
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> index abfc077fb0a8..093c4d1da557 100644
> --- a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> +++ b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> @@ -237,11 +237,11 @@ static int mtk_hdmi_pll_calc(struct mtk_hdmi_phy *hdmi_phy, struct clk_hw *hw,
>   	 */
>   	if (tmds_clk < 54 * MEGA)
>   		txposdiv = 8;
> -	else if (tmds_clk >= 54 * MEGA && tmds_clk < 148.35 * MEGA)
> +	else if (tmds_clk >= 54 * MEGA && (tmds_clk * 100) < 14835 * MEGA)
>   		txposdiv = 4;
> -	else if (tmds_clk >= 148.35 * MEGA && tmds_clk < 296.7 * MEGA)
> +	else if ((tmds_clk * 100) >= 14835 * MEGA && (tmds_clk * 10) < 2967 * MEGA)
>   		txposdiv = 2;
> -	else if (tmds_clk >= 296.7 * MEGA && tmds_clk <= 594 * MEGA)
> +	else if ((tmds_clk * 10) >= 2967 * MEGA && tmds_clk <= 594 * MEGA)
>   		txposdiv = 1;
>   	else
>   		return -EINVAL;
> @@ -328,12 +328,12 @@ static int mtk_hdmi_pll_drv_setting(struct clk_hw *hw)
>   		clk_channel_bias = 0x34; /* 20mA */
>   		impedance_en = 0xf;
>   		impedance = 0x36; /* 100ohm */
> -	} else if (pixel_clk >= 74.175 * MEGA && pixel_clk <= 300 * MEGA) {
> +	} else if (((u64)pixel_clk * 1000) >= 74175 * MEGA && pixel_clk <= 300 * MEGA) {
>   		data_channel_bias = 0x34; /* 20mA */
>   		clk_channel_bias = 0x2c; /* 16mA */
>   		impedance_en = 0xf;
>   		impedance = 0x36; /* 100ohm */
> -	} else if (pixel_clk >= 27 * MEGA && pixel_clk < 74.175 * MEGA) {
> +	} else if (pixel_clk >= 27 * MEGA && ((u64)pixel_clk * 1000) < 74175 * MEGA) {
>   		data_channel_bias = 0x14; /* 10mA */
>   		clk_channel_bias = 0x14; /* 10mA */
>   		impedance_en = 0x0;

-- 
linux-phy mailing list
linux-phy@lists.infradead.org
https://lists.infradead.org/mailman/listinfo/linux-phy

WARNING: multiple messages have this Message-ID (diff)
From: Matthias Brugger <matthias.bgg@gmail.com>
To: Tom Rix <trix@redhat.com>,
	chunkuang.hu@kernel.org, p.zabel@pengutronix.de,
	chunfeng.yun@mediatek.com, vkoul@kernel.org, kishon@kernel.org,
	angelogioacchino.delregno@collabora.com
Cc: linux-phy@lists.infradead.org,
	linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] phy: mediatek: rework the floating point comparisons to fixed point
Date: Mon, 8 May 2023 10:57:55 +0200	[thread overview]
Message-ID: <0cdd2d49-a2a0-4968-a978-3c3caa5741f8@gmail.com> (raw)
In-Reply-To: <20230502145005.2927101-1-trix@redhat.com>



On 02/05/2023 16:50, Tom Rix wrote:
> gcc on aarch64 reports
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c: In function ‘mtk_hdmi_pll_set_rate’:
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c:240:52: error: ‘-mgeneral-regs-only’
>    is incompatible with the use of floating-point types
>    240 |         else if (tmds_clk >= 54 * MEGA && tmds_clk < 148.35 * MEGA)
> 
> Floating point should not be used, so rework the floating point comparisons
> to fixed point.
> 
> Signed-off-by: Tom Rix <trix@redhat.com>

I think this is worth a fixes tag.

Regards,
Matthias

> ---
> v2: silence robot by casting types to u64
> 
> ---
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> index abfc077fb0a8..093c4d1da557 100644
> --- a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> +++ b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> @@ -237,11 +237,11 @@ static int mtk_hdmi_pll_calc(struct mtk_hdmi_phy *hdmi_phy, struct clk_hw *hw,
>   	 */
>   	if (tmds_clk < 54 * MEGA)
>   		txposdiv = 8;
> -	else if (tmds_clk >= 54 * MEGA && tmds_clk < 148.35 * MEGA)
> +	else if (tmds_clk >= 54 * MEGA && (tmds_clk * 100) < 14835 * MEGA)
>   		txposdiv = 4;
> -	else if (tmds_clk >= 148.35 * MEGA && tmds_clk < 296.7 * MEGA)
> +	else if ((tmds_clk * 100) >= 14835 * MEGA && (tmds_clk * 10) < 2967 * MEGA)
>   		txposdiv = 2;
> -	else if (tmds_clk >= 296.7 * MEGA && tmds_clk <= 594 * MEGA)
> +	else if ((tmds_clk * 10) >= 2967 * MEGA && tmds_clk <= 594 * MEGA)
>   		txposdiv = 1;
>   	else
>   		return -EINVAL;
> @@ -328,12 +328,12 @@ static int mtk_hdmi_pll_drv_setting(struct clk_hw *hw)
>   		clk_channel_bias = 0x34; /* 20mA */
>   		impedance_en = 0xf;
>   		impedance = 0x36; /* 100ohm */
> -	} else if (pixel_clk >= 74.175 * MEGA && pixel_clk <= 300 * MEGA) {
> +	} else if (((u64)pixel_clk * 1000) >= 74175 * MEGA && pixel_clk <= 300 * MEGA) {
>   		data_channel_bias = 0x34; /* 20mA */
>   		clk_channel_bias = 0x2c; /* 16mA */
>   		impedance_en = 0xf;
>   		impedance = 0x36; /* 100ohm */
> -	} else if (pixel_clk >= 27 * MEGA && pixel_clk < 74.175 * MEGA) {
> +	} else if (pixel_clk >= 27 * MEGA && ((u64)pixel_clk * 1000) < 74175 * MEGA) {
>   		data_channel_bias = 0x14; /* 10mA */
>   		clk_channel_bias = 0x14; /* 10mA */
>   		impedance_en = 0x0;

  parent reply	other threads:[~2023-05-08  8:58 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-02 14:50 [PATCH v2] phy: mediatek: rework the floating point comparisons to fixed point Tom Rix
2023-05-02 14:50 ` Tom Rix
2023-05-02 14:50 ` Tom Rix
2023-05-02 14:50 ` Tom Rix
2023-05-04  7:53 ` Chunfeng Yun (云春峰)
2023-05-04  7:53   ` Chunfeng Yun (云春峰)
2023-05-04  7:53   ` Chunfeng Yun (云春峰)
2023-05-04  7:53   ` Chunfeng Yun (云春峰)
2023-05-08  8:57 ` Matthias Brugger [this message]
2023-05-08  8:57   ` Matthias Brugger
2023-05-08  8:57   ` Matthias Brugger
2023-05-16 14:18 ` Vinod Koul
2023-05-16 14:18   ` Vinod Koul
2023-05-16 14:18   ` Vinod Koul
2023-05-16 14:18   ` Vinod Koul

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