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Date: Tue, 24 Apr 2012 07:57:38 +0200
From: Giuseppe CAVALLARO <peppe.cavallaro@...com>
To: Viresh Kumar <viresh.linux@...il.com>
Cc: akpm@...ux-foundation.org, spear-devel@...t.st.com,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
mturquette@...aro.org, sshtylyov@...sta.com, jgarzik@...hat.com,
Viresh Kumar <viresh.kumar@...com>,
"David S. Miller" <davem@...emloft.net>,
ML netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 08/13] net/stmmac: Remove conditional compilation of clk
code
+ netdev
On 4/24/2012 7:56 AM, Giuseppe CAVALLARO wrote:
> Hello Viresh.
>
> On 4/21/2012 1:47 PM, Viresh Kumar wrote:
>> With addition of dummy clk_*() calls for non CONFIG_HAVE_CLK cases in clk.h,
>> there is no need to have clk code enclosed in #ifdef CONFIG_HAVE_CLK, #endif
>> macros.
>
> I like this patch also because reduces ifdef in the code :-)
>
> Anyway this patch doesn't apply fine either in net-next and in net.git.
> Also I wonder if you had already tested the driver build on arch w/o
> HAVE_CLK ... just to avoid kernel build failures on other platforms.
>
> Let me know if I can help you on that.
>
> Peppe
>>
>> Signed-off-by: Viresh Kumar <viresh.kumar@...com>
>> Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
>> Cc: David S. Miller <davem@...emloft.net>
>> ---
>> drivers/net/ethernet/stmicro/stmmac/stmmac.h | 40 ---------------------
>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 34 +++++++++++-------
>> 2 files changed, 21 insertions(+), 53 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> index 9f2435c..7f85895 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
>> @@ -81,9 +81,7 @@ struct stmmac_priv {
>> struct stmmac_counters mmc;
>> struct dma_features dma_cap;
>> int hw_cap_support;
>> -#ifdef CONFIG_HAVE_CLK
>> struct clk *stmmac_clk;
>> -#endif
>> int clk_csr;
>> };
>>
>> @@ -103,41 +101,3 @@ int stmmac_dvr_remove(struct net_device *ndev);
>> struct stmmac_priv *stmmac_dvr_probe(struct device *device,
>> struct plat_stmmacenet_data *plat_dat,
>> void __iomem *addr);
>> -
>> -#ifdef CONFIG_HAVE_CLK
>> -static inline int stmmac_clk_enable(struct stmmac_priv *priv)
>> -{
>> - if (priv->stmmac_clk)
>> - return clk_enable(priv->stmmac_clk);
>> -
>> - return 0;
>> -}
>> -
>> -static inline void stmmac_clk_disable(struct stmmac_priv *priv)
>> -{
>> - if (priv->stmmac_clk)
>> - clk_disable(priv->stmmac_clk);
>> -}
>> -static inline int stmmac_clk_get(struct stmmac_priv *priv)
>> -{
>> - priv->stmmac_clk = clk_get(priv->device, NULL);
>> -
>> - if (IS_ERR(priv->stmmac_clk)) {
>> - pr_err("%s: ERROR clk_get failed\n", __func__);
>> - return PTR_ERR(priv->stmmac_clk);
>> - }
>> - return 0;
>> -}
>> -#else
>> -static inline int stmmac_clk_enable(struct stmmac_priv *priv)
>> -{
>> - return 0;
>> -}
>> -static inline void stmmac_clk_disable(struct stmmac_priv *priv)
>> -{
>> -}
>> -static inline int stmmac_clk_get(struct stmmac_priv *priv)
>> -{
>> - return 0;
>> -}
>> -#endif /* CONFIG_HAVE_CLK */
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index a64f0d4..28b8f30 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -28,6 +28,7 @@
>> https://bugzilla.stlinux.com/
>> *******************************************************************************/
>>
>> +#include <linux/clk.h>
>> #include <linux/kernel.h>
>> #include <linux/interrupt.h>
>> #include <linux/ip.h>
>> @@ -165,7 +166,6 @@ static void stmmac_verify_args(void)
>>
>> static void stmmac_clk_csr_set(struct stmmac_priv *priv)
>> {
>> -#ifdef CONFIG_HAVE_CLK
>> u32 clk_rate;
>>
>> clk_rate = clk_get_rate(priv->stmmac_clk);
>> @@ -189,7 +189,6 @@ static void stmmac_clk_csr_set(struct stmmac_priv *priv)
>> * we can not estimate the proper divider as it is not known
>> * the frequency of clk_csr_i. So we do not change the default
>> * divider. */
>> -#endif
>> }
>>
>> #if defined(STMMAC_XMIT_DEBUG) || defined(STMMAC_RX_DEBUG)
>> @@ -933,7 +932,8 @@ static int stmmac_open(struct net_device *dev)
>> struct stmmac_priv *priv = netdev_priv(dev);
>> int ret;
>>
>> - stmmac_clk_enable(priv);
>> + if (!IS_ERR(priv->stmmac_clk))
>> + clk_enable(priv->stmmac_clk);
>>
>> stmmac_check_ether_addr(priv);
>>
>> @@ -1068,7 +1068,9 @@ open_error:
>> phy_disconnect(priv->phydev);
>>
>> open_clk_dis:
>> - stmmac_clk_disable(priv);
>> + if (!IS_ERR(priv->stmmac_clk))
>> + clk_disable(priv->stmmac_clk);
>> +
>> return ret;
>> }
>>
>> @@ -1121,7 +1123,9 @@ static int stmmac_release(struct net_device *dev)
>> stmmac_exit_fs();
>> #endif
>> stmmac_mdio_unregister(dev);
>> - stmmac_clk_disable(priv);
>> +
>> + if (!IS_ERR(priv->stmmac_clk))
>> + clk_disable(priv->stmmac_clk);
>>
>> return 0;
>> }
>> @@ -1918,8 +1922,9 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
>> goto error;
>> }
>>
>> - if (stmmac_clk_get(priv))
>> - goto error;
>> + priv->stmmac_clk = clk_get(priv->device, NULL);
>> + if (IS_ERR(priv->stmmac_clk))
>> + pr_err("%s: No clock found\n", __func__);
>>
>> /* If a specific clk_csr value is passed from the platform
>> * this means that the CSR Clock Range selection cannot be
>> @@ -1927,10 +1932,12 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
>> * set the MDC clock dynamically according to the csr actual
>> * clock input.
>> */
>> - if (!priv->plat->clk_csr)
>> - stmmac_clk_csr_set(priv);
>> - else
>> + if (!priv->plat->clk_csr) {
>> + if (!IS_ERR(priv->stmmac_clk))
>> + stmmac_clk_csr_set(priv);
>> + } else {
>> priv->clk_csr = priv->plat->clk_csr;
>> + }
>>
>> return priv;
>>
>> @@ -2004,7 +2011,8 @@ int stmmac_suspend(struct net_device *ndev)
>> else {
>> stmmac_set_mac(priv->ioaddr, false);
>> /* Disable clock in case of PWM is off */
>> - stmmac_clk_disable(priv);
>> + if (!IS_ERR(priv->stmmac_clk))
>> + clk_disable(priv->stmmac_clk);
>> }
>> spin_unlock(&priv->lock);
>> return 0;
>> @@ -2026,9 +2034,9 @@ int stmmac_resume(struct net_device *ndev)
>> * from another devices (e.g. serial console). */
>> if (device_may_wakeup(priv->device))
>> priv->hw->mac->pmt(priv->ioaddr, 0);
>> - else
>> + else if (!IS_ERR(priv->stmmac_clk))
>> /* enable the clk prevously disabled */
>> - stmmac_clk_enable(priv);
>> + clk_enable(priv->stmmac_clk);
>>
>> netif_device_attach(ndev);
>>
>
--
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