[PATCH 1/6] mmc: zynq_sdhci: Resolve uninitialized return value

[Ashok Reddy Soma]

Hi Jaehoon,

> -----Original Message-----
> From: Jaehoon Chung <jh80.chung at samsung.com>
> Sent: Friday, July 9, 2021 3:08 PM
> To: Ashok Reddy Soma <ashokred at xilinx.com>; u-boot at lists.denx.de
> Cc: peng.fan at nxp.com; git <git at xilinx.com>; monstr at monstr.eu;
> somaashokreddy at gmail.com
> Subject: Re: [PATCH 1/6] mmc: zynq_sdhci: Resolve uninitialized return value
> 
> Hi Ashok,
> 
> On 7/9/21 4:17 PM, Ashok Reddy Soma wrote:
> > set_phase() functions are not modifying the ret value and returning
> > the same uninitialized ret, return 0 instead.
> 
> Why didn't you change from int to void?
> 

We are planning to change the way tapdelay's are set to use firmware function xilinx_pm_request() in place of arasan_zynqmp_set_out_tapdelay().
This return type int is a provision for that.

Thanks,
Ashok

> Best Regards,
> Jaehoon Chung
> 
> 
> >
> > Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma at xilinx.com>
> > ---
> >
> >  drivers/mmc/zynq_sdhci.c | 24 ++++++++++--------------
> >  1 file changed, 10 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/mmc/zynq_sdhci.c b/drivers/mmc/zynq_sdhci.c index
> > b79c4021b6..cb785fd735 100644
> > --- a/drivers/mmc/zynq_sdhci.c
> > +++ b/drivers/mmc/zynq_sdhci.c
> > @@ -182,8 +182,8 @@ static int arasan_sdhci_execute_tuning(struct mmc
> *mmc, u8 opcode)
> >   * Set the SD Output Clock Tap Delays for Output path
> >   *
> >   * @host:		Pointer to the sdhci_host structure.
> > - * @degrees:		The clock phase shift between 0 - 359.
> > - * Return: 0 on success and error value on error
> > + * @degrees		The clock phase shift between 0 - 359.
> > + * Return: 0
> >   */
> >  static int sdhci_zynqmp_sdcardclk_set_phase(struct sdhci_host *host,
> >  					    int degrees)
> > @@ -191,7 +191,6 @@ static int sdhci_zynqmp_sdcardclk_set_phase(struct
> sdhci_host *host,
> >  	struct arasan_sdhci_priv *priv = dev_get_priv(host->mmc->dev);
> >  	struct mmc *mmc = (struct mmc *)host->mmc;
> >  	u8 tap_delay, tap_max = 0;
> > -	int ret;
> >  	int timing = mode2timing[mmc->selected_mode];
> >
> >  	/*
> > @@ -229,7 +228,7 @@ static int sdhci_zynqmp_sdcardclk_set_phase(struct
> > sdhci_host *host,
> >
> >  	arasan_zynqmp_set_tapdelay(priv->deviceid, 0, tap_delay);
> >
> > -	return ret;
> > +	return 0;
> >  }
> >
> >  /**
> > @@ -238,8 +237,8 @@ static int sdhci_zynqmp_sdcardclk_set_phase(struct
> sdhci_host *host,
> >   * Set the SD Input Clock Tap Delays for Input path
> >   *
> >   * @host:		Pointer to the sdhci_host structure.
> > - * @degrees:		The clock phase shift between 0 - 359.
> > - * Return: 0 on success and error value on error
> > + * @degrees		The clock phase shift between 0 - 359.
> > + * Return: 0
> >   */
> >  static int sdhci_zynqmp_sampleclk_set_phase(struct sdhci_host *host,
> >  					    int degrees)
> > @@ -247,7 +246,6 @@ static int sdhci_zynqmp_sampleclk_set_phase(struct
> sdhci_host *host,
> >  	struct arasan_sdhci_priv *priv = dev_get_priv(host->mmc->dev);
> >  	struct mmc *mmc = (struct mmc *)host->mmc;
> >  	u8 tap_delay, tap_max = 0;
> > -	int ret;
> >  	int timing = mode2timing[mmc->selected_mode];
> >
> >  	/*
> > @@ -285,7 +283,7 @@ static int sdhci_zynqmp_sampleclk_set_phase(struct
> > sdhci_host *host,
> >
> >  	arasan_zynqmp_set_tapdelay(priv->deviceid, tap_delay, 0);
> >
> > -	return ret;
> > +	return 0;
> >  }
> >
> >  /**
> > @@ -295,14 +293,13 @@ static int
> sdhci_zynqmp_sampleclk_set_phase(struct sdhci_host *host,
> >   *
> >   * @host:		Pointer to the sdhci_host structure.
> >   * @degrees		The clock phase shift between 0 - 359.
> > - * Return: 0 on success and error value on error
> > + * Return: 0
> >   */
> >  static int sdhci_versal_sdcardclk_set_phase(struct sdhci_host *host,
> >  					    int degrees)
> >  {
> >  	struct mmc *mmc = (struct mmc *)host->mmc;
> >  	u8 tap_delay, tap_max = 0;
> > -	int ret;
> >  	int timing = mode2timing[mmc->selected_mode];
> >
> >  	/*
> > @@ -349,7 +346,7 @@ static int sdhci_versal_sdcardclk_set_phase(struct
> sdhci_host *host,
> >  		sdhci_writel(host, regval,
> SDHCI_ARASAN_OTAPDLY_REGISTER);
> >  	}
> >
> > -	return ret;
> > +	return 0;
> >  }
> >
> >  /**
> > @@ -359,14 +356,13 @@ static int sdhci_versal_sdcardclk_set_phase(struct
> sdhci_host *host,
> >   *
> >   * @host:		Pointer to the sdhci_host structure.
> >   * @degrees		The clock phase shift between 0 - 359.
> > - * Return: 0 on success and error value on error
> > + * Return: 0
> >   */
> >  static int sdhci_versal_sampleclk_set_phase(struct sdhci_host *host,
> >  					    int degrees)
> >  {
> >  	struct mmc *mmc = (struct mmc *)host->mmc;
> >  	u8 tap_delay, tap_max = 0;
> > -	int ret;
> >  	int timing = mode2timing[mmc->selected_mode];
> >
> >  	/*
> > @@ -417,7 +413,7 @@ static int sdhci_versal_sampleclk_set_phase(struct
> sdhci_host *host,
> >  		sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER);
> >  	}
> >
> > -	return ret;
> > +	return 0;
> >  }
> >
> >  static void arasan_sdhci_set_tapdelay(struct sdhci_host *host)
> >