Hi Subhash, The patch looks good to me. Reviewed-by: Arindam Nath <arindam.nath@xxxxxxx> Thanks, Arindam > -----Original Message----- > From: Subhash Jadavani [mailto:subhashj@xxxxxxxxxxxxxx] > Sent: Tuesday, August 23, 2011 5:14 PM > To: Nath, Arindam > Subject: RE: [PATCH v2 1/1] mmc: sd: UHS-I bus speed should be set last > in UHS initialization > > FYI ... > > > -----Original Message----- > > From: Subhash Jadavani [mailto:subhashj@xxxxxxxxxxxxxx] > > Sent: Tuesday, August 23, 2011 5:13 PM > > To: 'Arindam Nath' > > Subject: RE: [PATCH v2 1/1] mmc: sd: UHS-I bus speed should be set > last > > in UHS initialization > > > > Hi Arindam, > > > > Can you have a look at this patch? Do let me know if it looks ok or > > not? > > > > Regards, > > Subhash > > > > > -----Original Message----- > > > From: linux-arm-msm-owner@xxxxxxxxxxxxxxx [mailto:linux-arm-msm- > > > owner@xxxxxxxxxxxxxxx] On Behalf Of Subhash Jadavani > > > Sent: Monday, August 22, 2011 3:17 PM > > > To: Arindam Nath > > > Cc: linux-mmc@xxxxxxxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx; > Subhash > > > Jadavani > > > Subject: Re: [PATCH v2 1/1] mmc: sd: UHS-I bus speed should be set > > last > > > in UHS initialization > > > > > > Hi Arindam, > > > > > > Can you please check if this patch looks ok or not? > > > > > > Regards, > > > Subhash > > > > > > > mmc_sd_init_uhs_card function sets the driver type, current limit > > > > and bus speed mode on card as well as on host controller side. > > > > > > > > Currently bus speed mode is set by sending CMD6 to card and > > > > immediately setting the timing mode in host controller. But > > > > then before initiating tuning sequence, it also tries to set > > > > current limit by sending CMD6 to card which results in data > > > > timeout errors in controller if bus speed mode is SDR50/SDR104 > > mode. > > > > > > > > So basically bus speed mode should be set only after current > limit > > > > is set in the card and immediately after setting the bus speed > > mode, > > > > tuning sequence should be initiated. > > > > > > > > Signed-off-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx> > > > > --- > > > > drivers/mmc/core/sd.c | 81 > > > > ++++++++++++++++++++++++++++++++----------------- > > > > 1 files changed, 53 insertions(+), 28 deletions(-) > > > > > > > > diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c > > > > index e2dcf23..2191dda 100644 > > > > --- a/drivers/mmc/core/sd.c > > > > +++ b/drivers/mmc/core/sd.c > > > > @@ -459,56 +459,75 @@ static int sd_select_driver_type(struct > > > mmc_card > > > > *card, u8 *status) > > > > return 0; > > > > } > > > > > > > > -static int sd_set_bus_speed_mode(struct mmc_card *card, u8 > > *status) > > > > +static void sd_update_bus_speed_mode(struct mmc_card *card) > > > > { > > > > - unsigned int bus_speed = 0, timing = 0; > > > > - int err; > > > > - > > > > /* > > > > * If the host doesn't support any of the UHS-I modes, > fallback > > > on > > > > * default speed. > > > > */ > > > > if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | > MMC_CAP_UHS_SDR25 | > > > > - MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | > MMC_CAP_UHS_DDR50))) > > > > - return 0; > > > > + MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | > MMC_CAP_UHS_DDR50))) > > > { > > > > + card->sd_bus_speed = 0; > > > > + return; > > > > + } > > > > > > > > if ((card->host->caps & MMC_CAP_UHS_SDR104) && > > > > (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { > > > > - bus_speed = UHS_SDR104_BUS_SPEED; > > > > - timing = MMC_TIMING_UHS_SDR104; > > > > - card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; > > > > + card->sd_bus_speed = UHS_SDR104_BUS_SPEED; > > > > } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && > > > > (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) > { > > > > - bus_speed = UHS_DDR50_BUS_SPEED; > > > > - timing = MMC_TIMING_UHS_DDR50; > > > > - card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; > > > > + card->sd_bus_speed = UHS_DDR50_BUS_SPEED; > > > > } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | > > > > MMC_CAP_UHS_SDR50)) && (card- > >sw_caps.sd3_bus_mode & > > > > SD_MODE_UHS_SDR50)) { > > > > - bus_speed = UHS_SDR50_BUS_SPEED; > > > > - timing = MMC_TIMING_UHS_SDR50; > > > > - card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; > > > > + card->sd_bus_speed = UHS_SDR50_BUS_SPEED; > > > > } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | > > > > MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && > > > > (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) > { > > > > - bus_speed = UHS_SDR25_BUS_SPEED; > > > > - timing = MMC_TIMING_UHS_SDR25; > > > > - card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; > > > > + card->sd_bus_speed = UHS_SDR25_BUS_SPEED; > > > > } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | > > > > MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | > > > > MMC_CAP_UHS_SDR12)) && (card- > >sw_caps.sd3_bus_mode & > > > > SD_MODE_UHS_SDR12)) { > > > > - bus_speed = UHS_SDR12_BUS_SPEED; > > > > - timing = MMC_TIMING_UHS_SDR12; > > > > - card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; > > > > + card->sd_bus_speed = UHS_SDR12_BUS_SPEED; > > > > + } > > > > +} > > > > + > > > > +static int sd_set_bus_speed_mode(struct mmc_card *card, u8 > > *status) > > > > +{ > > > > + int err; > > > > + unsigned int timing = 0; > > > > + > > > > + switch (card->sd_bus_speed) { > > > > + case UHS_SDR104_BUS_SPEED: > > > > + timing = MMC_TIMING_UHS_SDR104; > > > > + card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; > > > > + break; > > > > + case UHS_DDR50_BUS_SPEED: > > > > + timing = MMC_TIMING_UHS_DDR50; > > > > + card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; > > > > + break; > > > > + case UHS_SDR50_BUS_SPEED: > > > > + timing = MMC_TIMING_UHS_SDR50; > > > > + card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; > > > > + break; > > > > + case UHS_SDR25_BUS_SPEED: > > > > + timing = MMC_TIMING_UHS_SDR25; > > > > + card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; > > > > + break; > > > > + case UHS_SDR12_BUS_SPEED: > > > > + timing = MMC_TIMING_UHS_SDR12; > > > > + card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; > > > > + break; > > > > + default: > > > > + return 0; > > > > } > > > > > > > > - card->sd_bus_speed = bus_speed; > > > > - err = mmc_sd_switch(card, 1, 0, bus_speed, status); > > > > + err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, > status); > > > > if (err) > > > > return err; > > > > > > > > - if ((status[16] & 0xF) != bus_speed) > > > > + if ((status[16] & 0xF) != card->sd_bus_speed) > > > > printk(KERN_WARNING "%s: Problem setting bus speed > > > mode!\n", > > > > mmc_hostname(card->host)); > > > > else { > > > > @@ -608,18 +627,24 @@ static int mmc_sd_init_uhs_card(struct > > mmc_card > > > > *card) > > > > mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); > > > > } > > > > > > > > + /* > > > > + * Select the bus speed mode depending on host > > > > + * and card capability. > > > > + */ > > > > + sd_update_bus_speed_mode(card); > > > > + > > > > /* Set the driver strength for the card */ > > > > err = sd_select_driver_type(card, status); > > > > if (err) > > > > goto out; > > > > > > > > - /* Set bus speed mode of the card */ > > > > - err = sd_set_bus_speed_mode(card, status); > > > > + /* Set current limit for the card */ > > > > + err = sd_set_current_limit(card, status); > > > > if (err) > > > > goto out; > > > > > > > > - /* Set current limit for the card */ > > > > - err = sd_set_current_limit(card, status); > > > > + /* Set bus speed mode of the card */ > > > > + err = sd_set_bus_speed_mode(card, status); > > > > if (err) > > > > goto out; > > > > > > > > -- > > > > 1.7.1.1 > > > > > > > > -- > > > > Sent by a consultant of the Qualcomm Innovation Center, Inc. > > > > The Qualcomm Innovation Center, Inc. is a member of the Code > Aurora > > > Forum. > > > > > > > > > > > > > > > > > -- > > > Sent by a consultant of the Qualcomm Innovation Center, Inc. > > > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora > > > Forum. > > > > > > -- > > > To unsubscribe from this list: send the line "unsubscribe linux- > arm- > > > msm" in > > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
