linux-kernel - Re: [PATCH v2 2/5] mmc: mediatek: Add Mediatek MMC driver

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Date:	Tue, 7 Apr 2015 16:01:46 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Chaotian Jing <chaotian.jing@...iatek.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	James Liao <jamesjj.liao@...iatek.com>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Arnd Bergmann <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Hongzhou Yang <hongzhou.yang@...iatek.com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-mmc@...r.kernel.org, Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-gpio@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>, bin.zhang@...iatek.com,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 2/5] mmc: mediatek: Add Mediatek MMC driver

2015-03-17 4:13 GMT+01:00 Chaotian Jing <chaotian.jing@...iatek.com>:
> Add Mediatek MMC driver code
>
> Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
> ---
>  drivers/mmc/host/Kconfig  |    8 +
>  drivers/mmc/host/Makefile |    1 +
>  drivers/mmc/host/mtk-sd.c | 1412 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 1421 insertions(+)
>  create mode 100644 drivers/mmc/host/mtk-sd.c
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 61ac63a..8b64377 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -768,3 +768,11 @@ config MMC_TOSHIBA_PCI
>         tristate "Toshiba Type A SD/MMC Card Interface Driver"
>         depends on PCI
>         help
> +
> +config MMC_MTK
> +       tristate "MediaTek SD/MMC Card Interface support"
> +       help
> +         This selects the MediaTek(R) Secure digital and Multimedia card Interface.
> +         If you have a machine with a integrated SD/MMC card reader, say Y or M here.
> +         This is needed if support for any SD/SDIO/MMC devices is required.
> +         If unsure, say N.
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 6a7cfe0..161b3e4 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -20,6 +20,7 @@ obj-$(CONFIG_MMC_SDHCI_F_SDH30)       += sdhci_f_sdh30.o
>  obj-$(CONFIG_MMC_SDHCI_SPEAR)  += sdhci-spear.o
>  obj-$(CONFIG_MMC_WBSD)         += wbsd.o
>  obj-$(CONFIG_MMC_AU1X)         += au1xmmc.o
> +obj-$(CONFIG_MMC_MTK)           += mtk-sd.o
>  obj-$(CONFIG_MMC_OMAP)         += omap.o
>  obj-$(CONFIG_MMC_OMAP_HS)      += omap_hsmmc.o
>  obj-$(CONFIG_MMC_ATMELMCI)     += atmel-mci.o
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> new file mode 100644
> index 0000000..86c999b
> --- /dev/null
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -0,0 +1,1412 @@
> +/*
> + * Copyright (c) 2014-2015 MediaTek Inc.
> + * Author: Chaotian.Jing <chaotian.jing@...iatek.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/ioport.h>
> +#include <linux/irq.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_gpio.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/spinlock.h>
> +
> +#include <linux/mmc/card.h>
> +#include <linux/mmc/core.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/mmc.h>
> +#include <linux/mmc/sd.h>
> +#include <linux/mmc/sdio.h>
> +
> +#define MAX_GPD_NUM         (1 + 1)    /* one null gpd */
> +#define MAX_BD_NUM          1024
> +#define MAX_BD_PER_GPD      MAX_BD_NUM

This looks strange.
Why don't you define MAX_GPD_NUM as two?
Why do you define MAX_BD_PER_GPD when it is the same as MAX_BD_NUM?

Cheers,
Matthias

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motzblog.wordpress.com
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