[2/9] phy: add Rockchip Innosilicon hdmi phy

[heiko@sntech.de (Heiko Stuebner)]

Am Freitag, 9. Februar 2018, 11:06:49 CET schrieb Andrzej Hajda:
> On 09.02.2018 10:24, Heiko Stuebner wrote:
> > Hi Martin,
> >
> > Am Montag, 5. Februar 2018, 22:32:08 CET schrieb Martin Cerveny:
> >> On Mon, 5 Feb 2018, Heiko Stuebner wrote:
> >>> From: Zheng Yang <zhengyang@rock-chips.com>
> >>>
> >>> Add a driver for the Innosilicon hdmi phy used on rk3228/rk3229
> >>> and rk3328 socs from Rockchip.
> >>>
> >>> Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
> >>> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
> >>> ---
> >>> +++ b/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
> >>> +static u32 inno_hdmi_phy_get_tmdsclk(struct inno_hdmi_phy *inno, int rate)
> >>> +{
> >>> +	int bus_width = phy_get_bus_width(inno->phy);
> >>> +	u32 tmdsclk;
> >>> +
> >>> +	switch (bus_width) {
> >>> +	case 4:
> >>> +		tmdsclk = rate / 2;
> >>> +		break;
> >>> +	case 5:
> >>> +		tmdsclk = rate * 5 / 8;
> >>> +		break;
> >>> +	case 6:
> >>> +		tmdsclk = rate * 3 / 4;
> >>> +		break;
> >>> +	case 10:
> >>> +		tmdsclk = rate * 5 / 4;
> >>> +		break;
> >>> +	case 12:
> >>> +		tmdsclk = rate * 3 / 2;
> >>> +		break;
> >>> +	case 16:
> >>> +		tmdsclk = rate * 2;
> >>> +		break;
> >>> +	default:
> >>> +		tmdsclk = rate;
> >>> +	}
> >>> +
> >>> +	return tmdsclk;
> >>> +}
> >> Please corrects integer overflow 
> >> like https://github.com/mcerveny/rockchip-linux/commit/b4bc703f2dca4e5115b22155920d2277671a9f00
> > thanks for finding that possible issue. I've adapted the phy driver
> > in a similar way (using u64 though) and will include that change in the
> > next version.
> 
> Btw, wouldn't be simpler to just use:
> switch (bus_width) {
> case 4:
> case 5:
> case 6:
> case 10:
> case 12:
> case 16:
>     return (u64)rate * bus_width / 8;
> default:
>     return rate;
> }

you're a genius ;-) .
I must be looking at this code for way to long to not see this relation.


Thanks
Heiko