linux-kernel - RE: [PATCH v2] USB: ehci-pci: USB host controller support for Intel Quark X1000

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D17267F31@AcuExch.aculab.com>
Date:	Fri, 27 Jun 2014 08:08:09 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Jingoo Han' <jg1.han@...sung.com>,
	"'Chen, Alvin'" <alvin.chen@...el.com>,
	'Alan Stern' <stern@...land.harvard.edu>
CC:	'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"'Sergei Shtylyov'" <sergei.shtylyov@...entembedded.com>,
	'Boon Leong Ong' <boon.leong.ong@...el.com>
Subject: RE: [PATCH v2] USB: ehci-pci: USB host controller support for Intel
 Quark X1000

From: Jingoo Han

...
> /* The maximal threshold value is 0x80, which means 512 bytes */
> #define EHCI_THRESHOLD_512BYTES		0x80
> #define EHCI_THRESHOLD_508BYTES		0x79

It would be better to define these using expressions. So:
#define EHCI_THRESHOLD_512BYTES		(512u / 8u)
#define EHCI_THRESHOLD_508BYTES		(508u / 8u)

Then you might decide to use:
#define EHCI_THRESHOLD(size) ((size) / 8u)

Then realise that the names are not generic EHCI, so need some
driver-specific prefix (for namespace reasons).

And that the defines are probably limit values, and should
be named as such.

	David



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