From: Tony Prisk <linux@prisktech.co.nz>
To: Axel Lin <axel.lin@ingics.com>, Chris Ball <cjb@laptop.org>
Cc: linux-mmc@vger.kernel.org
Subject: Re: [PATCH] mmc: wmt-sdmmc: Simplify wmt_set_sd_power implementation
Date: Sat, 05 Oct 2013 17:24:54 +1300 [thread overview]
Message-ID: <524F9496.8080209@prisktech.co.nz> (raw)
In-Reply-To: <1380791080.30876.2.camel@phoenix>
On 03/10/13 22:04, Axel Lin wrote:
> Simplify the code to set/clear BM_SD_OFF bit:
>
> | power_inverted: 0 | power_inverted: 1
> -------------------------------------------------
> enable: 0 | SET BM_SD_OFF | CLEAR BM_SD_OFF
> -------------------------------------------------
> enable: 1 | CLEAR BM_SD_OFF | SET BM_SD_OFF
>
> Signed-off-by: Axel Lin <axel.lin@ingics.com>
> ---
> drivers/mmc/host/wmt-sdmmc.c | 30 ++++++++----------------------
> 1 file changed, 8 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/mmc/host/wmt-sdmmc.c b/drivers/mmc/host/wmt-sdmmc.c
> index 34231d5..57858ef 100644
> --- a/drivers/mmc/host/wmt-sdmmc.c
> +++ b/drivers/mmc/host/wmt-sdmmc.c
> @@ -212,28 +212,14 @@ struct wmt_mci_priv {
>
> static void wmt_set_sd_power(struct wmt_mci_priv *priv, int enable)
> {
> - u32 reg_tmp;
> - if (enable) {
> - if (priv->power_inverted) {
> - reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
> - writeb(reg_tmp | BM_SD_OFF,
> - priv->sdmmc_base + SDMMC_BUSMODE);
> - } else {
> - reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
> - writeb(reg_tmp & (~BM_SD_OFF),
> - priv->sdmmc_base + SDMMC_BUSMODE);
> - }
> - } else {
> - if (priv->power_inverted) {
> - reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
> - writeb(reg_tmp & (~BM_SD_OFF),
> - priv->sdmmc_base + SDMMC_BUSMODE);
> - } else {
> - reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
> - writeb(reg_tmp | BM_SD_OFF,
> - priv->sdmmc_base + SDMMC_BUSMODE);
> - }
> - }
> + u32 reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
> +
> + if (enable ^ priv->power_inverted)
> + reg_tmp &= ~BM_SD_OFF;
> + else
> + reg_tmp |= BM_SD_OFF;
> +
> + writeb(reg_tmp, priv->sdmmc_base + SDMMC_BUSMODE);
> }
>
> static void wmt_mci_read_response(struct mmc_host *mmc)
Acked-by: Tony Prisk <linux@prisktech.co.nz>
Thanks Axel - much better code.
Regards
Tony Prisk
next prev parent reply other threads:[~2013-10-05 4:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-03 9:04 [PATCH] mmc: wmt-sdmmc: Simplify wmt_set_sd_power implementation Axel Lin
2013-10-05 4:24 ` Tony Prisk [this message]
2013-10-21 1:21 ` Chris Ball
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