* [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands [not found] <1389119511-26228-1-git-send-email-frankyl@broadcom.com> @ 2014-01-07 18:37 ` Franky Lin 2014-02-24 19:57 ` Franky Lin 2014-03-17 9:12 ` Ulf Hansson 0 siblings, 2 replies; 7+ messages in thread From: Franky Lin @ 2014-01-07 18:37 UTC (permalink / raw) To: chris; +Cc: linux-mmc For high clock frequency modes, ie. SDR104 and possibly SDR50, the data window on the CMD and DAT lines needs to be tuned. Once tuned to a sample clock rate, a re-tuning might required because of drifted signal on different lines. This re-tuning is needed and only necessary for commands using the DAT lines, ie. adtc type commands. This patch is an optimization by adding the condition of the requested command being adtc type in order to execute the re-tuning procedure. Signed-off-by: Franky Lin <frankyl@broadcom.com> --- drivers/mmc/host/sdhci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index cc00bed..f301cd6 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1389,7 +1389,8 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) * tuning procedure before sending command. */ if ((host->flags & SDHCI_NEEDS_RETUNING) && - !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) { + !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) && + mmc_cmd_type(mrq->cmd) == MMC_CMD_ADTC) { if (mmc->card) { /* eMMC uses cmd21 but sd and sdio use cmd19 */ tuning_opcode = -- 1.7.9.5 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands 2014-01-07 18:37 ` [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands Franky Lin @ 2014-02-24 19:57 ` Franky Lin 2014-03-07 19:54 ` Franky Lin 2014-03-17 9:12 ` Ulf Hansson 1 sibling, 1 reply; 7+ messages in thread From: Franky Lin @ 2014-02-24 19:57 UTC (permalink / raw) To: chris; +Cc: linux-mmc Hi Chris, On 01/07/2014 10:37 AM, Franky Lin wrote: > For high clock frequency modes, ie. SDR104 and possibly SDR50, the data > window on the CMD and DAT lines needs to be tuned. Once tuned to a > sample clock rate, a re-tuning might required because of drifted signal > on different lines. This re-tuning is needed and only necessary for > commands using the DAT lines, ie. adtc type commands. This patch is an > optimization by adding the condition of the requested command being adtc > type in order to execute the re-tuning procedure. > > Signed-off-by: Franky Lin <frankyl@broadcom.com> > --- Is this still in your queue? Any remarks on it? Thanks, Franky > drivers/mmc/host/sdhci.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index cc00bed..f301cd6 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -1389,7 +1389,8 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) > * tuning procedure before sending command. > */ > if ((host->flags & SDHCI_NEEDS_RETUNING) && > - !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) { > + !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) && > + mmc_cmd_type(mrq->cmd) == MMC_CMD_ADTC) { > if (mmc->card) { > /* eMMC uses cmd21 but sd and sdio use cmd19 */ > tuning_opcode = > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands 2014-02-24 19:57 ` Franky Lin @ 2014-03-07 19:54 ` Franky Lin 2014-03-15 19:16 ` Franky Lin 0 siblings, 1 reply; 7+ messages in thread From: Franky Lin @ 2014-03-07 19:54 UTC (permalink / raw) To: chris; +Cc: linux-mmc, ulf.hansson On 02/24/2014 11:57 AM, Franky Lin wrote: > Hi Chris, > > On 01/07/2014 10:37 AM, Franky Lin wrote: >> For high clock frequency modes, ie. SDR104 and possibly SDR50, the data >> window on the CMD and DAT lines needs to be tuned. Once tuned to a >> sample clock rate, a re-tuning might required because of drifted signal >> on different lines. This re-tuning is needed and only necessary for >> commands using the DAT lines, ie. adtc type commands. This patch is an >> optimization by adding the condition of the requested command being adtc >> type in order to execute the re-tuning procedure. >> >> Signed-off-by: Franky Lin <frankyl@broadcom.com> >> --- > > Is this still in your queue? Any remarks on it? > > Thanks, > Franky > Ping? >> drivers/mmc/host/sdhci.c | 3 ++- >> 1 file changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c >> index cc00bed..f301cd6 100644 >> --- a/drivers/mmc/host/sdhci.c >> +++ b/drivers/mmc/host/sdhci.c >> @@ -1389,7 +1389,8 @@ static void sdhci_request(struct mmc_host *mmc, >> struct mmc_request *mrq) >> * tuning procedure before sending command. >> */ >> if ((host->flags & SDHCI_NEEDS_RETUNING) && >> - !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) { >> + !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) && >> + mmc_cmd_type(mrq->cmd) == MMC_CMD_ADTC) { >> if (mmc->card) { >> /* eMMC uses cmd21 but sd and sdio use cmd19 */ >> tuning_opcode = >> > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands 2014-03-07 19:54 ` Franky Lin @ 2014-03-15 19:16 ` Franky Lin 0 siblings, 0 replies; 7+ messages in thread From: Franky Lin @ 2014-03-15 19:16 UTC (permalink / raw) To: chris, ulf.hansson; +Cc: linux-mmc Hi Chris and Ulf, On 03/07/2014 11:54 AM, Franky Lin wrote: > On 02/24/2014 11:57 AM, Franky Lin wrote: >> Hi Chris, >> >> On 01/07/2014 10:37 AM, Franky Lin wrote: >>> For high clock frequency modes, ie. SDR104 and possibly SDR50, the data >>> window on the CMD and DAT lines needs to be tuned. Once tuned to a >>> sample clock rate, a re-tuning might required because of drifted signal >>> on different lines. This re-tuning is needed and only necessary for >>> commands using the DAT lines, ie. adtc type commands. This patch is an >>> optimization by adding the condition of the requested command being adtc >>> type in order to execute the re-tuning procedure. >>> >>> Signed-off-by: Franky Lin <frankyl@broadcom.com> >>> --- >> >> Is this still in your queue? Any remarks on it? >> >> Thanks, >> Franky >> > > Ping? Need to try my luck again. :) Could you please share your thought about this patch? Thanks, Franky > >>> drivers/mmc/host/sdhci.c | 3 ++- >>> 1 file changed, 2 insertions(+), 1 deletion(-) >>> >>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c >>> index cc00bed..f301cd6 100644 >>> --- a/drivers/mmc/host/sdhci.c >>> +++ b/drivers/mmc/host/sdhci.c >>> @@ -1389,7 +1389,8 @@ static void sdhci_request(struct mmc_host *mmc, >>> struct mmc_request *mrq) >>> * tuning procedure before sending command. >>> */ >>> if ((host->flags & SDHCI_NEEDS_RETUNING) && >>> - !(present_state & (SDHCI_DOING_WRITE | >>> SDHCI_DOING_READ))) { >>> + !(present_state & (SDHCI_DOING_WRITE | >>> SDHCI_DOING_READ)) && >>> + mmc_cmd_type(mrq->cmd) == MMC_CMD_ADTC) { >>> if (mmc->card) { >>> /* eMMC uses cmd21 but sd and sdio use cmd19 */ >>> tuning_opcode = >>> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >> the body of a message to majordomo@vger.kernel.org >> 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@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands 2014-01-07 18:37 ` [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands Franky Lin 2014-02-24 19:57 ` Franky Lin @ 2014-03-17 9:12 ` Ulf Hansson 2014-03-17 16:51 ` Franky Lin 1 sibling, 1 reply; 7+ messages in thread From: Ulf Hansson @ 2014-03-17 9:12 UTC (permalink / raw) To: Franky Lin; +Cc: Chris Ball, linux-mmc On 7 January 2014 19:37, Franky Lin <frankyl@broadcom.com> wrote: > For high clock frequency modes, ie. SDR104 and possibly SDR50, the data > window on the CMD and DAT lines needs to be tuned. Once tuned to a > sample clock rate, a re-tuning might required because of drifted signal > on different lines. This re-tuning is needed and only necessary for > commands using the DAT lines, ie. adtc type commands. This patch is an > optimization by adding the condition of the requested command being adtc > type in order to execute the re-tuning procedure. > > Signed-off-by: Franky Lin <frankyl@broadcom.com> Hi Franky, Sorry for the delay. > --- > drivers/mmc/host/sdhci.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index cc00bed..f301cd6 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -1389,7 +1389,8 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) > * tuning procedure before sending command. > */ > if ((host->flags & SDHCI_NEEDS_RETUNING) && > - !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) { > + !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) && > + mmc_cmd_type(mrq->cmd) == MMC_CMD_ADTC) { I don't have the in-depth knowledge about the sdhci; Still, to me it seems like checking for MMC_CMD_ADTC, is that not just the same a checking if there are a READ/WRITE? Another note, we really should be working on moving the periodic "re-tuning trigger" mechanism into the mmc core layer, so all host driver's could benefit from this. Do you want to help out fixing this? Kind regards Ulf Hansson > if (mmc->card) { > /* eMMC uses cmd21 but sd and sdio use cmd19 */ > tuning_opcode = > -- > 1.7.9.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands 2014-03-17 9:12 ` Ulf Hansson @ 2014-03-17 16:51 ` Franky Lin 2014-03-26 16:49 ` Franky Lin 0 siblings, 1 reply; 7+ messages in thread From: Franky Lin @ 2014-03-17 16:51 UTC (permalink / raw) To: Ulf Hansson; +Cc: Chris Ball, linux-mmc Hi Ulf, On 03/17/2014 02:12 AM, Ulf Hansson wrote: > On 7 January 2014 19:37, Franky Lin <frankyl@broadcom.com> wrote: >> For high clock frequency modes, ie. SDR104 and possibly SDR50, the data >> window on the CMD and DAT lines needs to be tuned. Once tuned to a >> sample clock rate, a re-tuning might required because of drifted signal >> on different lines. This re-tuning is needed and only necessary for >> commands using the DAT lines, ie. adtc type commands. This patch is an >> optimization by adding the condition of the requested command being adtc >> type in order to execute the re-tuning procedure. >> >> Signed-off-by: Franky Lin <frankyl@broadcom.com> > > Hi Franky, > > Sorry for the delay. > >> --- >> drivers/mmc/host/sdhci.c | 3 ++- >> 1 file changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c >> index cc00bed..f301cd6 100644 >> --- a/drivers/mmc/host/sdhci.c >> +++ b/drivers/mmc/host/sdhci.c >> @@ -1389,7 +1389,8 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) >> * tuning procedure before sending command. >> */ >> if ((host->flags & SDHCI_NEEDS_RETUNING) && >> - !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) { >> + !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) && >> + mmc_cmd_type(mrq->cmd) == MMC_CMD_ADTC) { > > I don't have the in-depth knowledge about the sdhci; Still, to me it > seems like checking for MMC_CMD_ADTC, is that not just the same a > checking if there are a READ/WRITE? non-adtc commands like CMD17/CMD24/CMD52 do not use the data lines. Tuning is only necessary for adtc commands as CMD18/CMD25/CMD53 which involve data lines. > Another note, we really should be working on moving the periodic > "re-tuning trigger" mechanism into the mmc core layer, so all host > driver's could benefit from this. Do you want to help out fixing this? I thought about this before but hesitated because of non-sdhci drivers. I have seen some of them don't have standardized implementation(well if they do they would have used sdhci anyway). Thanks, Franky > Kind regards > Ulf Hansson > >> if (mmc->card) { >> /* eMMC uses cmd21 but sd and sdio use cmd19 */ >> tuning_opcode = >> -- >> 1.7.9.5 >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >> the body of a message to majordomo@vger.kernel.org >> 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@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > ^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands 2014-03-17 16:51 ` Franky Lin @ 2014-03-26 16:49 ` Franky Lin 0 siblings, 0 replies; 7+ messages in thread From: Franky Lin @ 2014-03-26 16:49 UTC (permalink / raw) To: Ulf Hansson, Chris Ball; +Cc: linux-mmc On 03/17/2014 09:51 AM, Franky Lin wrote: > Hi Ulf, > > On 03/17/2014 02:12 AM, Ulf Hansson wrote: >> On 7 January 2014 19:37, Franky Lin <frankyl@broadcom.com> wrote: >>> For high clock frequency modes, ie. SDR104 and possibly SDR50, the data >>> window on the CMD and DAT lines needs to be tuned. Once tuned to a >>> sample clock rate, a re-tuning might required because of drifted signal >>> on different lines. This re-tuning is needed and only necessary for >>> commands using the DAT lines, ie. adtc type commands. This patch is an >>> optimization by adding the condition of the requested command being >>> adtc >>> type in order to execute the re-tuning procedure. >>> >>> Signed-off-by: Franky Lin <frankyl@broadcom.com> >> >> Hi Franky, >> >> Sorry for the delay. >> >>> --- >>> drivers/mmc/host/sdhci.c | 3 ++- >>> 1 file changed, 2 insertions(+), 1 deletion(-) >>> >>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c >>> index cc00bed..f301cd6 100644 >>> --- a/drivers/mmc/host/sdhci.c >>> +++ b/drivers/mmc/host/sdhci.c >>> @@ -1389,7 +1389,8 @@ static void sdhci_request(struct mmc_host >>> *mmc, struct mmc_request *mrq) >>> * tuning procedure before sending command. >>> */ >>> if ((host->flags & SDHCI_NEEDS_RETUNING) && >>> - !(present_state & (SDHCI_DOING_WRITE | >>> SDHCI_DOING_READ))) { >>> + !(present_state & (SDHCI_DOING_WRITE | >>> SDHCI_DOING_READ)) && >>> + mmc_cmd_type(mrq->cmd) == MMC_CMD_ADTC) { >> >> I don't have the in-depth knowledge about the sdhci; Still, to me it >> seems like checking for MMC_CMD_ADTC, is that not just the same a >> checking if there are a READ/WRITE? > > non-adtc commands like CMD17/CMD24/CMD52 do not use the data lines. > Tuning is only necessary for adtc commands as CMD18/CMD25/CMD53 which > involve data lines. > >> Another note, we really should be working on moving the periodic >> "re-tuning trigger" mechanism into the mmc core layer, so all host >> driver's could benefit from this. Do you want to help out fixing this? > > I thought about this before but hesitated because of non-sdhci > drivers. I have seen some of them don't have standardized > implementation(well if they do they would have used sdhci anyway). > Ping? ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2014-03-26 16:49 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
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[not found] <1389119511-26228-1-git-send-email-frankyl@broadcom.com>
2014-01-07 18:37 ` [PATCH] mmc: sdhci: only invoke clock re-tuning for adtc type commands Franky Lin
2014-02-24 19:57 ` Franky Lin
2014-03-07 19:54 ` Franky Lin
2014-03-15 19:16 ` Franky Lin
2014-03-17 9:12 ` Ulf Hansson
2014-03-17 16:51 ` Franky Lin
2014-03-26 16:49 ` Franky Lin
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