Re: [PATCH 08/13] net/stmmac: Remove conditional compilation of clkcode

From: Giuseppe CAVALLARO
Date: Tue Apr 24 2012 - 02:00:22 EST

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@xxxxxx>
> Cc: Giuseppe Cavallaro <peppe.cavallaro@xxxxxx>
> Cc: David S. Miller <davem@xxxxxxxxxxxxx>
> ---
> 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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