| Message ID | 20220721055924.9043-1-sh043.lee@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mmc: sd: Remove the patch that fix signal voltage when there is no power cycle | expand |
> -----Original Message----- > From: Seunghui Lee <sh043.lee@samsung.com> > Sent: Thursday, July 21, 2022 2:59 PM > To: ulf.hansson@linaro.org; linux-mmc@vger.kernel.org; > adrian.hunter@intel.com > Cc: Seunghui Lee <sh043.lee@samsung.com>; DooHyun Hwang > <dh0421.hwang@samsung.com> > Subject: [PATCH] mmc: sd: Remove the patch that fix signal voltage when > there is no power cycle > > At first, all error flow of mmc_set_uhs_voltage() has power cycle except > R1_ERROR and no start_signal_voltage_switch() func pointer. > > There is the performance regression issue of SDR104 SD card from the > market VOC. Normally, once a SDR104 SD card fails to switch voltage, it > works HS mode. > And then it initializes SDR104 mode after system resume or error handling. > > However, with below patch, > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ > drivers/mmc/core/sd.c?id=6a11fc47f175c8d87018e89cb58e2d36c66534cb > Once a SD card does, it initializes SDR25 mode forever after system resume > or error handling(re-initialized). > Host updates sd3_bus_mode by calling mmc_read_switch(), the value of > sd3_bus_mode doesn't set for SDR104, SDR50 and DDR50 mode. > > So, if host doesn't update sd3_bus_mode, the SD card works SDR104 mode > after system resume or error-handling. > > Here is an example. > > AS-IS : test log > // normal case : sd3_bus_mode = 0x1F, sd_bus_speed = SDR104, clock 208MHz > [ 111.907789] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1119: > caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage > =0x1. > [ 111.907824] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1149: rocr > 0xc1ff8000, S18A, uhs. > [ 111.908707] [1: kworker/1:3: 772] [TEST] sd_update_bus_speed_mode: > caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = > 0x40000. > [ 111.912484] [1: kworker/1:3: 772] [TEST] sd_set_bus_speed_mode: > sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. > // resume : issue occurs : SDcard doesn't release busy for checking 10 > times > [ 112.096550] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: > card->ocr 0x40000. > [ 112.096560] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr > 0x40000(pocr 0x40000), retries 10. > ... > [ 114.531129] [5: kworker/5:2: 207] [TEST] mmc_power_cycle. > [ 114.579500] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr > 0x41040000(pocr 0x40000), retries 0. > [ 114.579506] [5: kworker/5:2: 207] mmc0: Skipping voltage switch > [ 114.757575] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: > caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage > =0x0. > [ 114.757583] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1128: > switch with oldcard. > [ 114.759742] [5: kworker/5:2: 207] [TEST] mmc_read_switch: sd_switch > ret 0, sd3_bus_mode=3. > // sd3_bus_mode = 0x3 supports HS, SDR25 and SDR12 > [ 114.759750] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1157: > switch hs. > // next resume : the SDcard initializes to SDR25(HS) mode(sd_bus_speed = 1) > by sd3_bus_mode setting with clk 50MHz > [ 114.968346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: > card->ocr 0x40000. > [ 114.968359] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr > 0x40000(pocr 0x40000), retries 10. > [ 115.167346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: > caps=0x407f020f, sd3_bus_mode=0x3, v18_fixup_failed false, signal_voltage > =0x1. > [ 115.167366] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1149: rocr > 0xc1ff8000, S18A, uhs. > [ 115.168041] [5: kworker/5:2: 207] [TEST] mmc_sd_init_uhs_card: before > update: caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 3, card->ocr = > 0x40000. > [ 115.168051] [5: kworker/5:2: 207] [TEST] sd_update_bus_speed_mode: > caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 1, card->ocr = 0x40000. > [ 115.169176] [5: kworker/5:2: 207] [TEST] sd_set_bus_speed_mode: > sd_bus_speed=1, timing=4, uhs_max_dtr=50000000, card->ocr=0x40000. > > TO-BE : TEST log with this commit > // resume : issue occurs : SDcard doesn't release busy for checking 10 > times > [ 1843.594805] [4: kworker/4:5:21512] [TEST] mmc_sd_get_cid: ocr > 0x41040000(pocr 0x40000), retries 0. > [ 1843.594812] [4: kworker/4:5:21512] mmc0: Skipping voltage switch > [ 1843.772555] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1122: > caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage > =0x0. > // no update sd3_bus_mode value > [ 1843.772563] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1164: > switch hs. > // next resume : the SDcard initializes to SDR104 > [ 1844.191295] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: 1122: > caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage > =0x1. > [ 1844.191315] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: 1154: > rocr 0xc1ff8000, S18A, uhs. > [ 1844.192175] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_uhs_card: > before update: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, > card->ocr = 0x40000. > [ 1844.192187] [5: kworker/5:93: 2282] [TEST] sd_update_bus_speed_mode: > caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = > 0x40000. > [ 1844.198697] [5: kworker/5:93: 2282] [TEST] sd_set_bus_speed_mode: > sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. > > Signed-off-by: Seunghui Lee <sh043.lee@samsung.com> > Tested-by: DooHyun Hwang <dh0421.hwang@samsung.com> > --- > drivers/mmc/core/sd.c | 47 ++----------------------------------------- > 1 file changed, 2 insertions(+), 45 deletions(-) > > diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index > cee4c0b59f43..4e3d39956185 100644 > --- a/drivers/mmc/core/sd.c > +++ b/drivers/mmc/core/sd.c > @@ -1001,18 +1001,6 @@ unsigned mmc_sd_get_max_clock(struct mmc_card *card) > return max_dtr; > } > > -static bool mmc_sd_card_using_v18(struct mmc_card *card) -{ > - /* > - * According to the SD spec., the Bus Speed Mode (function group 1) > bits > - * 2 to 4 are zero if the card is initialized at 3.3V signal level. > Thus > - * they can be used to determine if the card has already switched > to > - * 1.8V signaling. > - */ > - return card->sw_caps.sd3_bus_mode & > - (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); > -} > - > static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 > offset, > u8 reg_data) > { > @@ -1400,10 +1388,9 @@ static int mmc_sd_init_card(struct mmc_host *host, > u32 ocr, > int err; > u32 cid[4]; > u32 rocr = 0; > - bool v18_fixup_failed = false; > > WARN_ON(!host->claimed); > -retry: > + > err = mmc_sd_get_cid(host, ocr, cid, &rocr); > if (err) > return err; > @@ -1472,36 +1459,6 @@ static int mmc_sd_init_card(struct mmc_host *host, > u32 ocr, > if (err) > goto free_card; > > - /* > - * If the card has not been power cycled, it may still be using > 1.8V > - * signaling. Detect that situation and try to initialize a UHS-I > (1.8V) > - * transfer mode. > - */ > - if (!v18_fixup_failed && !mmc_host_is_spi(host) && > mmc_host_uhs(host) && > - mmc_sd_card_using_v18(card) && > - host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { > - /* > - * Re-read switch information in case it has changed since > - * oldcard was initialized. > - */ > - if (oldcard) { > - err = mmc_read_switch(card); > - if (err) > - goto free_card; > - } > - if (mmc_sd_card_using_v18(card)) { > - if (mmc_host_set_uhs_voltage(host) || > - mmc_sd_init_uhs_card(card)) { > - v18_fixup_failed = true; > - mmc_power_cycle(host, ocr); > - if (!oldcard) > - mmc_remove_card(card); > - goto retry; > - } > - goto done; > - } > - } > - > /* Initialization sequence for UHS-I cards */ > if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { > err = mmc_sd_init_uhs_card(card); > @@ -1566,7 +1523,7 @@ static int mmc_sd_init_card(struct mmc_host *host, > u32 ocr, > err = -EINVAL; > goto free_card; > } > -done: > + > host->card = card; > return 0; > > -- > 2.29.0 Dear All, Please review this commit. Once the SDR104 SD card fails to switch voltage, there is no chance to work SDR104 bus speed again due to update sd3_bus_mode. To fix this regression issue, do not update sd3_bus_mode. And then it has the chance to work SDR104 again. AS-IS: voltage_switch fail -> mmc_read_switch() -> HS mode next system resume voltage switch success -> SDR25 mode TO-BE: Voltage switch fail -> HS mode Next system resume Voltage switch success -> SDR104 mode And plus, mmc_set_uhs_voltage() has power_cycle now. It means that if voltage switch fails, the card initializes 3.3V signal level. Regards, Seunghui Lee.
On 26/07/22 05:56, Seunghui Lee wrote: >> -----Original Message----- >> From: Seunghui Lee <sh043.lee@samsung.com> >> Sent: Thursday, July 21, 2022 2:59 PM >> To: ulf.hansson@linaro.org; linux-mmc@vger.kernel.org; >> adrian.hunter@intel.com >> Cc: Seunghui Lee <sh043.lee@samsung.com>; DooHyun Hwang >> <dh0421.hwang@samsung.com> >> Subject: [PATCH] mmc: sd: Remove the patch that fix signal voltage when >> there is no power cycle >> >> At first, all error flow of mmc_set_uhs_voltage() has power cycle except >> R1_ERROR and no start_signal_voltage_switch() func pointer. >> >> There is the performance regression issue of SDR104 SD card from the >> market VOC. Normally, once a SDR104 SD card fails to switch voltage, it >> works HS mode. >> And then it initializes SDR104 mode after system resume or error handling. >> >> However, with below patch, >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ >> drivers/mmc/core/sd.c?id=6a11fc47f175c8d87018e89cb58e2d36c66534cb >> Once a SD card does, it initializes SDR25 mode forever after system resume >> or error handling(re-initialized). >> Host updates sd3_bus_mode by calling mmc_read_switch(), the value of >> sd3_bus_mode doesn't set for SDR104, SDR50 and DDR50 mode. >> >> So, if host doesn't update sd3_bus_mode, the SD card works SDR104 mode >> after system resume or error-handling. >> >> Here is an example. >> >> AS-IS : test log >> // normal case : sd3_bus_mode = 0x1F, sd_bus_speed = SDR104, clock 208MHz >> [ 111.907789] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1119: >> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage >> =0x1. >> [ 111.907824] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1149: rocr >> 0xc1ff8000, S18A, uhs. >> [ 111.908707] [1: kworker/1:3: 772] [TEST] sd_update_bus_speed_mode: >> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = >> 0x40000. >> [ 111.912484] [1: kworker/1:3: 772] [TEST] sd_set_bus_speed_mode: >> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. >> // resume : issue occurs : SDcard doesn't release busy for checking 10 >> times >> [ 112.096550] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: >> card->ocr 0x40000. >> [ 112.096560] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr >> 0x40000(pocr 0x40000), retries 10. >> ... >> [ 114.531129] [5: kworker/5:2: 207] [TEST] mmc_power_cycle. >> [ 114.579500] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr >> 0x41040000(pocr 0x40000), retries 0. >> [ 114.579506] [5: kworker/5:2: 207] mmc0: Skipping voltage switch >> [ 114.757575] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: >> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage >> =0x0. >> [ 114.757583] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1128: >> switch with oldcard. >> [ 114.759742] [5: kworker/5:2: 207] [TEST] mmc_read_switch: sd_switch >> ret 0, sd3_bus_mode=3. >> // sd3_bus_mode = 0x3 supports HS, SDR25 and SDR12 >> [ 114.759750] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1157: >> switch hs. >> // next resume : the SDcard initializes to SDR25(HS) mode(sd_bus_speed = 1) >> by sd3_bus_mode setting with clk 50MHz >> [ 114.968346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: >> card->ocr 0x40000. >> [ 114.968359] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr >> 0x40000(pocr 0x40000), retries 10. >> [ 115.167346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: >> caps=0x407f020f, sd3_bus_mode=0x3, v18_fixup_failed false, signal_voltage >> =0x1. >> [ 115.167366] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1149: rocr >> 0xc1ff8000, S18A, uhs. >> [ 115.168041] [5: kworker/5:2: 207] [TEST] mmc_sd_init_uhs_card: before >> update: caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 3, card->ocr = >> 0x40000. >> [ 115.168051] [5: kworker/5:2: 207] [TEST] sd_update_bus_speed_mode: >> caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 1, card->ocr = 0x40000. >> [ 115.169176] [5: kworker/5:2: 207] [TEST] sd_set_bus_speed_mode: >> sd_bus_speed=1, timing=4, uhs_max_dtr=50000000, card->ocr=0x40000. >> >> TO-BE : TEST log with this commit >> // resume : issue occurs : SDcard doesn't release busy for checking 10 >> times >> [ 1843.594805] [4: kworker/4:5:21512] [TEST] mmc_sd_get_cid: ocr >> 0x41040000(pocr 0x40000), retries 0. >> [ 1843.594812] [4: kworker/4:5:21512] mmc0: Skipping voltage switch >> [ 1843.772555] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1122: >> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage >> =0x0. >> // no update sd3_bus_mode value >> [ 1843.772563] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1164: >> switch hs. >> // next resume : the SDcard initializes to SDR104 >> [ 1844.191295] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: 1122: >> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage >> =0x1. >> [ 1844.191315] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: 1154: >> rocr 0xc1ff8000, S18A, uhs. >> [ 1844.192175] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_uhs_card: >> before update: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, >> card->ocr = 0x40000. >> [ 1844.192187] [5: kworker/5:93: 2282] [TEST] sd_update_bus_speed_mode: >> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = >> 0x40000. >> [ 1844.198697] [5: kworker/5:93: 2282] [TEST] sd_set_bus_speed_mode: >> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. >> >> Signed-off-by: Seunghui Lee <sh043.lee@samsung.com> >> Tested-by: DooHyun Hwang <dh0421.hwang@samsung.com> >> --- >> drivers/mmc/core/sd.c | 47 ++----------------------------------------- >> 1 file changed, 2 insertions(+), 45 deletions(-) >> >> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index >> cee4c0b59f43..4e3d39956185 100644 >> --- a/drivers/mmc/core/sd.c >> +++ b/drivers/mmc/core/sd.c >> @@ -1001,18 +1001,6 @@ unsigned mmc_sd_get_max_clock(struct mmc_card *card) >> return max_dtr; >> } >> >> -static bool mmc_sd_card_using_v18(struct mmc_card *card) -{ >> - /* >> - * According to the SD spec., the Bus Speed Mode (function group 1) >> bits >> - * 2 to 4 are zero if the card is initialized at 3.3V signal level. >> Thus >> - * they can be used to determine if the card has already switched >> to >> - * 1.8V signaling. >> - */ >> - return card->sw_caps.sd3_bus_mode & >> - (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); >> -} >> - >> static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 >> offset, >> u8 reg_data) >> { >> @@ -1400,10 +1388,9 @@ static int mmc_sd_init_card(struct mmc_host *host, >> u32 ocr, >> int err; >> u32 cid[4]; >> u32 rocr = 0; >> - bool v18_fixup_failed = false; >> >> WARN_ON(!host->claimed); >> -retry: >> + >> err = mmc_sd_get_cid(host, ocr, cid, &rocr); >> if (err) >> return err; >> @@ -1472,36 +1459,6 @@ static int mmc_sd_init_card(struct mmc_host *host, >> u32 ocr, >> if (err) >> goto free_card; >> >> - /* >> - * If the card has not been power cycled, it may still be using >> 1.8V >> - * signaling. Detect that situation and try to initialize a UHS-I >> (1.8V) >> - * transfer mode. >> - */ >> - if (!v18_fixup_failed && !mmc_host_is_spi(host) && >> mmc_host_uhs(host) && >> - mmc_sd_card_using_v18(card) && >> - host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { >> - /* >> - * Re-read switch information in case it has changed since >> - * oldcard was initialized. >> - */ >> - if (oldcard) { >> - err = mmc_read_switch(card); >> - if (err) >> - goto free_card; >> - } >> - if (mmc_sd_card_using_v18(card)) { >> - if (mmc_host_set_uhs_voltage(host) || >> - mmc_sd_init_uhs_card(card)) { >> - v18_fixup_failed = true; >> - mmc_power_cycle(host, ocr); >> - if (!oldcard) >> - mmc_remove_card(card); >> - goto retry; >> - } >> - goto done; >> - } >> - } >> - >> /* Initialization sequence for UHS-I cards */ >> if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { >> err = mmc_sd_init_uhs_card(card); >> @@ -1566,7 +1523,7 @@ static int mmc_sd_init_card(struct mmc_host *host, >> u32 ocr, >> err = -EINVAL; >> goto free_card; >> } >> -done: >> + >> host->card = card; >> return 0; >> >> -- >> 2.29.0 > > Dear All, > > Please review this commit. I have started to look at it, but my time is limited at the moment. Note the original patch is 5 years old and fixes a real problem, so we don't want to just throw it away. > > Once the SDR104 SD card fails to switch voltage, > there is no chance to work SDR104 bus speed again > due to update sd3_bus_mode. > > To fix this regression issue, do not update sd3_bus_mode. > And then it has the chance to work SDR104 again. > > AS-IS: > voltage_switch fail -> mmc_read_switch() -> HS mode > next system resume > voltage switch success -> SDR25 mode > > TO-BE: > Voltage switch fail -> HS mode > Next system resume > Voltage switch success -> SDR104 mode > > And plus, mmc_set_uhs_voltage() has power_cycle now. > It means that if voltage switch fails, > the card initializes 3.3V signal level. > > Regards, > Seunghui Lee. >
> -----Original Message----- > From: Adrian Hunter <adrian.hunter@intel.com> > Sent: Tuesday, July 26, 2022 7:57 PM > To: Seunghui Lee <sh043.lee@samsung.com>; linux-mmc@vger.kernel.org; > adrian.hunter@intel.com > Cc: 'DooHyun Hwang' <dh0421.hwang@samsung.com> > Subject: Re: [PATCH] mmc: sd: Remove the patch that fix signal voltage > when there is no power cycle > > On 26/07/22 05:56, Seunghui Lee wrote: > >> -----Original Message----- > >> From: Seunghui Lee <sh043.lee@samsung.com> > >> Sent: Thursday, July 21, 2022 2:59 PM > >> To: ulf.hansson@linaro.org; linux-mmc@vger.kernel.org; > >> adrian.hunter@intel.com > >> Cc: Seunghui Lee <sh043.lee@samsung.com>; DooHyun Hwang > >> <dh0421.hwang@samsung.com> > >> Subject: [PATCH] mmc: sd: Remove the patch that fix signal voltage > >> when there is no power cycle > >> > >> At first, all error flow of mmc_set_uhs_voltage() has power cycle > >> except R1_ERROR and no start_signal_voltage_switch() func pointer. > >> > >> There is the performance regression issue of SDR104 SD card from the > >> market VOC. Normally, once a SDR104 SD card fails to switch voltage, > >> it works HS mode. > >> And then it initializes SDR104 mode after system resume or error > handling. > >> > >> However, with below patch, > >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/co > >> mmit/ > >> drivers/mmc/core/sd.c?id=6a11fc47f175c8d87018e89cb58e2d36c66534cb > >> Once a SD card does, it initializes SDR25 mode forever after system > >> resume or error handling(re-initialized). > >> Host updates sd3_bus_mode by calling mmc_read_switch(), the value of > >> sd3_bus_mode doesn't set for SDR104, SDR50 and DDR50 mode. > >> > >> So, if host doesn't update sd3_bus_mode, the SD card works SDR104 > >> mode after system resume or error-handling. > >> > >> Here is an example. > >> > >> AS-IS : test log > >> // normal case : sd3_bus_mode = 0x1F, sd_bus_speed = SDR104, clock > 208MHz > >> [ 111.907789] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1119: > >> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, > >> signal_voltage =0x1. > >> [ 111.907824] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1149: > rocr > >> 0xc1ff8000, S18A, uhs. > >> [ 111.908707] [1: kworker/1:3: 772] [TEST] sd_update_bus_speed_mode: > >> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = > >> 0x40000. > >> [ 111.912484] [1: kworker/1:3: 772] [TEST] sd_set_bus_speed_mode: > >> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. > >> // resume : issue occurs : SDcard doesn't release busy for checking > >> 10 times > >> [ 112.096550] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: > >> card->ocr 0x40000. > >> [ 112.096560] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr > >> 0x40000(pocr 0x40000), retries 10. > >> ... > >> [ 114.531129] [5: kworker/5:2: 207] [TEST] mmc_power_cycle. > >> [ 114.579500] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr > >> 0x41040000(pocr 0x40000), retries 0. > >> [ 114.579506] [5: kworker/5:2: 207] mmc0: Skipping voltage switch > >> [ 114.757575] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: > >> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, > >> signal_voltage =0x0. > >> [ 114.757583] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1128: > >> switch with oldcard. > >> [ 114.759742] [5: kworker/5:2: 207] [TEST] mmc_read_switch: > sd_switch > >> ret 0, sd3_bus_mode=3. > >> // sd3_bus_mode = 0x3 supports HS, SDR25 and SDR12 > >> [ 114.759750] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1157: > >> switch hs. > >> // next resume : the SDcard initializes to SDR25(HS) > >> mode(sd_bus_speed = 1) by sd3_bus_mode setting with clk 50MHz > >> [ 114.968346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: > >> card->ocr 0x40000. > >> [ 114.968359] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr > >> 0x40000(pocr 0x40000), retries 10. > >> [ 115.167346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: > >> caps=0x407f020f, sd3_bus_mode=0x3, v18_fixup_failed false, > >> signal_voltage =0x1. > >> [ 115.167366] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1149: > rocr > >> 0xc1ff8000, S18A, uhs. > >> [ 115.168041] [5: kworker/5:2: 207] [TEST] mmc_sd_init_uhs_card: > before > >> update: caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 3, > >> card->ocr = 0x40000. > >> [ 115.168051] [5: kworker/5:2: 207] [TEST] sd_update_bus_speed_mode: > >> caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 1, card->ocr = > 0x40000. > >> [ 115.169176] [5: kworker/5:2: 207] [TEST] sd_set_bus_speed_mode: > >> sd_bus_speed=1, timing=4, uhs_max_dtr=50000000, card->ocr=0x40000. > >> > >> TO-BE : TEST log with this commit > >> // resume : issue occurs : SDcard doesn't release busy for checking > >> 10 times > >> [ 1843.594805] [4: kworker/4:5:21512] [TEST] mmc_sd_get_cid: ocr > >> 0x41040000(pocr 0x40000), retries 0. > >> [ 1843.594812] [4: kworker/4:5:21512] mmc0: Skipping voltage switch > >> [ 1843.772555] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1122: > >> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, > >> signal_voltage =0x0. > >> // no update sd3_bus_mode value > >> [ 1843.772563] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1164: > >> switch hs. > >> // next resume : the SDcard initializes to SDR104 > >> [ 1844.191295] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: 1122: > >> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, > >> signal_voltage =0x1. > >> [ 1844.191315] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: 1154: > >> rocr 0xc1ff8000, S18A, uhs. > >> [ 1844.192175] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_uhs_card: > >> before update: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = > >> 3, > >> card->ocr = 0x40000. > >> [ 1844.192187] [5: kworker/5:93: 2282] [TEST] > sd_update_bus_speed_mode: > >> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = > >> 0x40000. > >> [ 1844.198697] [5: kworker/5:93: 2282] [TEST] sd_set_bus_speed_mode: > >> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. > >> > >> Signed-off-by: Seunghui Lee <sh043.lee@samsung.com> > >> Tested-by: DooHyun Hwang <dh0421.hwang@samsung.com> > >> --- > >> drivers/mmc/core/sd.c | 47 > >> ++----------------------------------------- > >> 1 file changed, 2 insertions(+), 45 deletions(-) > >> > >> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index > >> cee4c0b59f43..4e3d39956185 100644 > >> --- a/drivers/mmc/core/sd.c > >> +++ b/drivers/mmc/core/sd.c > >> @@ -1001,18 +1001,6 @@ unsigned mmc_sd_get_max_clock(struct mmc_card > *card) > >> return max_dtr; > >> } > >> > >> -static bool mmc_sd_card_using_v18(struct mmc_card *card) -{ > >> - /* > >> - * According to the SD spec., the Bus Speed Mode (function group 1) > >> bits > >> - * 2 to 4 are zero if the card is initialized at 3.3V signal level. > >> Thus > >> - * they can be used to determine if the card has already switched > >> to > >> - * 1.8V signaling. > >> - */ > >> - return card->sw_caps.sd3_bus_mode & > >> - (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); > >> -} > >> - > >> static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, > >> u16 offset, > >> u8 reg_data) > >> { > >> @@ -1400,10 +1388,9 @@ static int mmc_sd_init_card(struct mmc_host > >> *host, > >> u32 ocr, > >> int err; > >> u32 cid[4]; > >> u32 rocr = 0; > >> - bool v18_fixup_failed = false; > >> > >> WARN_ON(!host->claimed); > >> -retry: > >> + > >> err = mmc_sd_get_cid(host, ocr, cid, &rocr); > >> if (err) > >> return err; > >> @@ -1472,36 +1459,6 @@ static int mmc_sd_init_card(struct mmc_host > >> *host, > >> u32 ocr, > >> if (err) > >> goto free_card; > >> > >> - /* > >> - * If the card has not been power cycled, it may still be using > >> 1.8V > >> - * signaling. Detect that situation and try to initialize a UHS-I > >> (1.8V) > >> - * transfer mode. > >> - */ > >> - if (!v18_fixup_failed && !mmc_host_is_spi(host) && > >> mmc_host_uhs(host) && > >> - mmc_sd_card_using_v18(card) && > >> - host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { > >> - /* > >> - * Re-read switch information in case it has changed since > >> - * oldcard was initialized. > >> - */ > >> - if (oldcard) { > >> - err = mmc_read_switch(card); > >> - if (err) > >> - goto free_card; > >> - } > >> - if (mmc_sd_card_using_v18(card)) { > >> - if (mmc_host_set_uhs_voltage(host) || > >> - mmc_sd_init_uhs_card(card)) { > >> - v18_fixup_failed = true; > >> - mmc_power_cycle(host, ocr); > >> - if (!oldcard) > >> - mmc_remove_card(card); > >> - goto retry; > >> - } > >> - goto done; > >> - } > >> - } > >> - > >> /* Initialization sequence for UHS-I cards */ > >> if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { > >> err = mmc_sd_init_uhs_card(card); > >> @@ -1566,7 +1523,7 @@ static int mmc_sd_init_card(struct mmc_host > >> *host, > >> u32 ocr, > >> err = -EINVAL; > >> goto free_card; > >> } > >> -done: > >> + > >> host->card = card; > >> return 0; > >> > >> -- > >> 2.29.0 > > > > Dear All, > > > > Please review this commit. > > I have started to look at it, but my time is limited at the moment. > > Note the original patch is 5 years old and fixes a real problem, so we > don't want to just throw it away. > Dear Mr. hunter, Could you check this with below patch? https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/mmc/core/core.c?id=147186f531ae49c18b7a9091a2c40e83b3d95649 In the mmc_set_uhs_voltaga func(), once it occurs error, it has power_cycle except R1_ERROR with CMD11. So, When mmc_set_uhs_voltage() return error, host and card can't leave 1.8V voltage. Regards, > > > > Once the SDR104 SD card fails to switch voltage, there is no chance to > > work SDR104 bus speed again due to update sd3_bus_mode. > > > > To fix this regression issue, do not update sd3_bus_mode. > > And then it has the chance to work SDR104 again. > > > > AS-IS: > > voltage_switch fail -> mmc_read_switch() -> HS mode next system resume > > voltage switch success -> SDR25 mode > > > > TO-BE: > > Voltage switch fail -> HS mode > > Next system resume > > Voltage switch success -> SDR104 mode > > > > And plus, mmc_set_uhs_voltage() has power_cycle now. > > It means that if voltage switch fails, the card initializes 3.3V > > signal level. > > > > Regards, > > Seunghui Lee. > >
On 8/08/22 11:24, Seunghui Lee wrote: >> -----Original Message----- >> From: Adrian Hunter <adrian.hunter@intel.com> >> Sent: Tuesday, July 26, 2022 7:57 PM >> To: Seunghui Lee <sh043.lee@samsung.com>; linux-mmc@vger.kernel.org; >> adrian.hunter@intel.com >> Cc: 'DooHyun Hwang' <dh0421.hwang@samsung.com> >> Subject: Re: [PATCH] mmc: sd: Remove the patch that fix signal voltage >> when there is no power cycle >> >> On 26/07/22 05:56, Seunghui Lee wrote: >>>> -----Original Message----- >>>> From: Seunghui Lee <sh043.lee@samsung.com> >>>> Sent: Thursday, July 21, 2022 2:59 PM >>>> To: ulf.hansson@linaro.org; linux-mmc@vger.kernel.org; >>>> adrian.hunter@intel.com >>>> Cc: Seunghui Lee <sh043.lee@samsung.com>; DooHyun Hwang >>>> <dh0421.hwang@samsung.com> >>>> Subject: [PATCH] mmc: sd: Remove the patch that fix signal voltage >>>> when there is no power cycle >>>> >>>> At first, all error flow of mmc_set_uhs_voltage() has power cycle >>>> except R1_ERROR and no start_signal_voltage_switch() func pointer. >>>> >>>> There is the performance regression issue of SDR104 SD card from the >>>> market VOC. Normally, once a SDR104 SD card fails to switch voltage, >>>> it works HS mode. >>>> And then it initializes SDR104 mode after system resume or error >> handling. >>>> >>>> However, with below patch, >>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/co >>>> mmit/ >>>> drivers/mmc/core/sd.c?id=6a11fc47f175c8d87018e89cb58e2d36c66534cb >>>> Once a SD card does, it initializes SDR25 mode forever after system >>>> resume or error handling(re-initialized). >>>> Host updates sd3_bus_mode by calling mmc_read_switch(), the value of >>>> sd3_bus_mode doesn't set for SDR104, SDR50 and DDR50 mode. >>>> >>>> So, if host doesn't update sd3_bus_mode, the SD card works SDR104 >>>> mode after system resume or error-handling. >>>> >>>> Here is an example. >>>> >>>> AS-IS : test log >>>> // normal case : sd3_bus_mode = 0x1F, sd_bus_speed = SDR104, clock >> 208MHz >>>> [ 111.907789] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1119: >>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, >>>> signal_voltage =0x1. >>>> [ 111.907824] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1149: >> rocr >>>> 0xc1ff8000, S18A, uhs. >>>> [ 111.908707] [1: kworker/1:3: 772] [TEST] sd_update_bus_speed_mode: >>>> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = >>>> 0x40000. >>>> [ 111.912484] [1: kworker/1:3: 772] [TEST] sd_set_bus_speed_mode: >>>> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. >>>> // resume : issue occurs : SDcard doesn't release busy for checking >>>> 10 times >>>> [ 112.096550] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: >>>> card->ocr 0x40000. >>>> [ 112.096560] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr >>>> 0x40000(pocr 0x40000), retries 10. >>>> ... >>>> [ 114.531129] [5: kworker/5:2: 207] [TEST] mmc_power_cycle. >>>> [ 114.579500] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr >>>> 0x41040000(pocr 0x40000), retries 0. >>>> [ 114.579506] [5: kworker/5:2: 207] mmc0: Skipping voltage switch >>>> [ 114.757575] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: >>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, >>>> signal_voltage =0x0. >>>> [ 114.757583] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1128: >>>> switch with oldcard. >>>> [ 114.759742] [5: kworker/5:2: 207] [TEST] mmc_read_switch: >> sd_switch >>>> ret 0, sd3_bus_mode=3. >>>> // sd3_bus_mode = 0x3 supports HS, SDR25 and SDR12 >>>> [ 114.759750] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1157: >>>> switch hs. >>>> // next resume : the SDcard initializes to SDR25(HS) >>>> mode(sd_bus_speed = 1) by sd3_bus_mode setting with clk 50MHz >>>> [ 114.968346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: >>>> card->ocr 0x40000. >>>> [ 114.968359] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr >>>> 0x40000(pocr 0x40000), retries 10. >>>> [ 115.167346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: >>>> caps=0x407f020f, sd3_bus_mode=0x3, v18_fixup_failed false, >>>> signal_voltage =0x1. >>>> [ 115.167366] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1149: >> rocr >>>> 0xc1ff8000, S18A, uhs. >>>> [ 115.168041] [5: kworker/5:2: 207] [TEST] mmc_sd_init_uhs_card: >> before >>>> update: caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 3, >>>> card->ocr = 0x40000. >>>> [ 115.168051] [5: kworker/5:2: 207] [TEST] sd_update_bus_speed_mode: >>>> caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 1, card->ocr = >> 0x40000. >>>> [ 115.169176] [5: kworker/5:2: 207] [TEST] sd_set_bus_speed_mode: >>>> sd_bus_speed=1, timing=4, uhs_max_dtr=50000000, card->ocr=0x40000. >>>> >>>> TO-BE : TEST log with this commit >>>> // resume : issue occurs : SDcard doesn't release busy for checking >>>> 10 times >>>> [ 1843.594805] [4: kworker/4:5:21512] [TEST] mmc_sd_get_cid: ocr >>>> 0x41040000(pocr 0x40000), retries 0. >>>> [ 1843.594812] [4: kworker/4:5:21512] mmc0: Skipping voltage switch >>>> [ 1843.772555] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1122: >>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, >>>> signal_voltage =0x0. >>>> // no update sd3_bus_mode value >>>> [ 1843.772563] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1164: >>>> switch hs. >>>> // next resume : the SDcard initializes to SDR104 >>>> [ 1844.191295] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: 1122: >>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, >>>> signal_voltage =0x1. >>>> [ 1844.191315] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: 1154: >>>> rocr 0xc1ff8000, S18A, uhs. >>>> [ 1844.192175] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_uhs_card: >>>> before update: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = >>>> 3, >>>> card->ocr = 0x40000. >>>> [ 1844.192187] [5: kworker/5:93: 2282] [TEST] >> sd_update_bus_speed_mode: >>>> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = >>>> 0x40000. >>>> [ 1844.198697] [5: kworker/5:93: 2282] [TEST] sd_set_bus_speed_mode: >>>> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. >>>> >>>> Signed-off-by: Seunghui Lee <sh043.lee@samsung.com> >>>> Tested-by: DooHyun Hwang <dh0421.hwang@samsung.com> >>>> --- >>>> drivers/mmc/core/sd.c | 47 >>>> ++----------------------------------------- >>>> 1 file changed, 2 insertions(+), 45 deletions(-) >>>> >>>> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index >>>> cee4c0b59f43..4e3d39956185 100644 >>>> --- a/drivers/mmc/core/sd.c >>>> +++ b/drivers/mmc/core/sd.c >>>> @@ -1001,18 +1001,6 @@ unsigned mmc_sd_get_max_clock(struct mmc_card >> *card) >>>> return max_dtr; >>>> } >>>> >>>> -static bool mmc_sd_card_using_v18(struct mmc_card *card) -{ >>>> - /* >>>> - * According to the SD spec., the Bus Speed Mode (function group 1) >>>> bits >>>> - * 2 to 4 are zero if the card is initialized at 3.3V signal level. >>>> Thus >>>> - * they can be used to determine if the card has already switched >>>> to >>>> - * 1.8V signaling. >>>> - */ >>>> - return card->sw_caps.sd3_bus_mode & >>>> - (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); >>>> -} >>>> - >>>> static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, >>>> u16 offset, >>>> u8 reg_data) >>>> { >>>> @@ -1400,10 +1388,9 @@ static int mmc_sd_init_card(struct mmc_host >>>> *host, >>>> u32 ocr, >>>> int err; >>>> u32 cid[4]; >>>> u32 rocr = 0; >>>> - bool v18_fixup_failed = false; >>>> >>>> WARN_ON(!host->claimed); >>>> -retry: >>>> + >>>> err = mmc_sd_get_cid(host, ocr, cid, &rocr); >>>> if (err) >>>> return err; >>>> @@ -1472,36 +1459,6 @@ static int mmc_sd_init_card(struct mmc_host >>>> *host, >>>> u32 ocr, >>>> if (err) >>>> goto free_card; >>>> >>>> - /* >>>> - * If the card has not been power cycled, it may still be using >>>> 1.8V >>>> - * signaling. Detect that situation and try to initialize a UHS-I >>>> (1.8V) >>>> - * transfer mode. >>>> - */ >>>> - if (!v18_fixup_failed && !mmc_host_is_spi(host) && >>>> mmc_host_uhs(host) && >>>> - mmc_sd_card_using_v18(card) && >>>> - host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { >>>> - /* >>>> - * Re-read switch information in case it has changed since >>>> - * oldcard was initialized. >>>> - */ >>>> - if (oldcard) { >>>> - err = mmc_read_switch(card); >>>> - if (err) >>>> - goto free_card; >>>> - } >>>> - if (mmc_sd_card_using_v18(card)) { >>>> - if (mmc_host_set_uhs_voltage(host) || >>>> - mmc_sd_init_uhs_card(card)) { >>>> - v18_fixup_failed = true; >>>> - mmc_power_cycle(host, ocr); >>>> - if (!oldcard) >>>> - mmc_remove_card(card); >>>> - goto retry; >>>> - } >>>> - goto done; >>>> - } >>>> - } >>>> - >>>> /* Initialization sequence for UHS-I cards */ >>>> if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { >>>> err = mmc_sd_init_uhs_card(card); >>>> @@ -1566,7 +1523,7 @@ static int mmc_sd_init_card(struct mmc_host >>>> *host, >>>> u32 ocr, >>>> err = -EINVAL; >>>> goto free_card; >>>> } >>>> -done: >>>> + >>>> host->card = card; >>>> return 0; >>>> >>>> -- >>>> 2.29.0 >>> >>> Dear All, >>> >>> Please review this commit. >> >> I have started to look at it, but my time is limited at the moment. >> >> Note the original patch is 5 years old and fixes a real problem, so we >> don't want to just throw it away. >> > > Dear Mr. hunter, > > Could you check this with below patch? > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/mmc/core/core.c?id=147186f531ae49c18b7a9091a2c40e83b3d95649 > > In the mmc_set_uhs_voltaga func(), > once it occurs error, it has power_cycle except R1_ERROR with CMD11. > So, When mmc_set_uhs_voltage() return error, > host and card can't leave 1.8V voltage. > > Regards, > >>> >>> Once the SDR104 SD card fails to switch voltage, there is no chance to >>> work SDR104 bus speed again due to update sd3_bus_mode. >>> >>> To fix this regression issue, do not update sd3_bus_mode. >>> And then it has the chance to work SDR104 again. >>> >>> AS-IS: >>> voltage_switch fail -> mmc_read_switch() -> HS mode next system resume >>> voltage switch success -> SDR25 mode >>> >>> TO-BE: >>> Voltage switch fail -> HS mode >>> Next system resume >>> Voltage switch success -> SDR104 mode >>> >>> And plus, mmc_set_uhs_voltage() has power_cycle now. >>> It means that if voltage switch fails, the card initializes 3.3V >>> signal level. >>> >>> Regards, >>> Seunghui Lee. >>> > > Does this help? diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index cee4c0b59f43..1abe8af48bfc 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -949,15 +949,15 @@ int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, /* Erase init depends on CSD and SSR */ mmc_init_erase(card); - - /* - * Fetch switch information from card. - */ - err = mmc_read_switch(card); - if (err) - return err; } + /* + * Fetch switch information from card. + */ + err = mmc_read_switch(card); + if (err) + return err; + /* * For SPI, enable CRC as appropriate. * This CRC enable is located AFTER the reading of the
> -----Original Message----- > From: Adrian Hunter <adrian.hunter@intel.com> > Sent: Tuesday, August 9, 2022 2:37 PM > To: Seunghui Lee <sh043.lee@samsung.com>; linux-mmc@vger.kernel.org > Cc: 'DooHyun Hwang' <dh0421.hwang@samsung.com> > Subject: Re: [PATCH] mmc: sd: Remove the patch that fix signal voltage > when there is no power cycle > > On 8/08/22 11:24, Seunghui Lee wrote: > >> -----Original Message----- > >> From: Adrian Hunter <adrian.hunter@intel.com> > >> Sent: Tuesday, July 26, 2022 7:57 PM > >> To: Seunghui Lee <sh043.lee@samsung.com>; linux-mmc@vger.kernel.org; > >> adrian.hunter@intel.com > >> Cc: 'DooHyun Hwang' <dh0421.hwang@samsung.com> > >> Subject: Re: [PATCH] mmc: sd: Remove the patch that fix signal > >> voltage when there is no power cycle > >> > >> On 26/07/22 05:56, Seunghui Lee wrote: > >>>> -----Original Message----- > >>>> From: Seunghui Lee <sh043.lee@samsung.com> > >>>> Sent: Thursday, July 21, 2022 2:59 PM > >>>> To: ulf.hansson@linaro.org; linux-mmc@vger.kernel.org; > >>>> adrian.hunter@intel.com > >>>> Cc: Seunghui Lee <sh043.lee@samsung.com>; DooHyun Hwang > >>>> <dh0421.hwang@samsung.com> > >>>> Subject: [PATCH] mmc: sd: Remove the patch that fix signal voltage > >>>> when there is no power cycle > >>>> > >>>> At first, all error flow of mmc_set_uhs_voltage() has power cycle > >>>> except R1_ERROR and no start_signal_voltage_switch() func pointer. > >>>> > >>>> There is the performance regression issue of SDR104 SD card from > >>>> the market VOC. Normally, once a SDR104 SD card fails to switch > >>>> voltage, it works HS mode. > >>>> And then it initializes SDR104 mode after system resume or error > >> handling. > >>>> > >>>> However, with below patch, > >>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ > >>>> co > >>>> mmit/ > >>>> drivers/mmc/core/sd.c?id=6a11fc47f175c8d87018e89cb58e2d36c66534cb > >>>> Once a SD card does, it initializes SDR25 mode forever after system > >>>> resume or error handling(re-initialized). > >>>> Host updates sd3_bus_mode by calling mmc_read_switch(), the value > >>>> of sd3_bus_mode doesn't set for SDR104, SDR50 and DDR50 mode. > >>>> > >>>> So, if host doesn't update sd3_bus_mode, the SD card works SDR104 > >>>> mode after system resume or error-handling. > >>>> > >>>> Here is an example. > >>>> > >>>> AS-IS : test log > >>>> // normal case : sd3_bus_mode = 0x1F, sd_bus_speed = SDR104, clock > >> 208MHz > >>>> [ 111.907789] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1119: > >>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, > >>>> signal_voltage =0x1. > >>>> [ 111.907824] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1149: > >> rocr > >>>> 0xc1ff8000, S18A, uhs. > >>>> [ 111.908707] [1: kworker/1:3: 772] [TEST] > sd_update_bus_speed_mode: > >>>> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = > >>>> 0x40000. > >>>> [ 111.912484] [1: kworker/1:3: 772] [TEST] sd_set_bus_speed_mode: > >>>> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. > >>>> // resume : issue occurs : SDcard doesn't release busy for checking > >>>> 10 times > >>>> [ 112.096550] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: > >>>> card->ocr 0x40000. > >>>> [ 112.096560] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr > >>>> 0x40000(pocr 0x40000), retries 10. > >>>> ... > >>>> [ 114.531129] [5: kworker/5:2: 207] [TEST] mmc_power_cycle. > >>>> [ 114.579500] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr > >>>> 0x41040000(pocr 0x40000), retries 0. > >>>> [ 114.579506] [5: kworker/5:2: 207] mmc0: Skipping voltage switch > >>>> [ 114.757575] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: > >>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, > >>>> signal_voltage =0x0. > >>>> [ 114.757583] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1128: > >>>> switch with oldcard. > >>>> [ 114.759742] [5: kworker/5:2: 207] [TEST] mmc_read_switch: > >> sd_switch > >>>> ret 0, sd3_bus_mode=3. > >>>> // sd3_bus_mode = 0x3 supports HS, SDR25 and SDR12 > >>>> [ 114.759750] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1157: > >>>> switch hs. > >>>> // next resume : the SDcard initializes to SDR25(HS) > >>>> mode(sd_bus_speed = 1) by sd3_bus_mode setting with clk 50MHz > >>>> [ 114.968346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: > >>>> card->ocr 0x40000. > >>>> [ 114.968359] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr > >>>> 0x40000(pocr 0x40000), retries 10. > >>>> [ 115.167346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: > >>>> caps=0x407f020f, sd3_bus_mode=0x3, v18_fixup_failed false, > >>>> signal_voltage =0x1. > >>>> [ 115.167366] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1149: > >> rocr > >>>> 0xc1ff8000, S18A, uhs. > >>>> [ 115.168041] [5: kworker/5:2: 207] [TEST] mmc_sd_init_uhs_card: > >> before > >>>> update: caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 3, > >>>> card->ocr = 0x40000. > >>>> [ 115.168051] [5: kworker/5:2: 207] [TEST] > sd_update_bus_speed_mode: > >>>> caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 1, card->ocr = > >> 0x40000. > >>>> [ 115.169176] [5: kworker/5:2: 207] [TEST] sd_set_bus_speed_mode: > >>>> sd_bus_speed=1, timing=4, uhs_max_dtr=50000000, card->ocr=0x40000. > >>>> > >>>> TO-BE : TEST log with this commit > >>>> // resume : issue occurs : SDcard doesn't release busy for checking > >>>> 10 times > >>>> [ 1843.594805] [4: kworker/4:5:21512] [TEST] mmc_sd_get_cid: ocr > >>>> 0x41040000(pocr 0x40000), retries 0. > >>>> [ 1843.594812] [4: kworker/4:5:21512] mmc0: Skipping voltage switch > >>>> [ 1843.772555] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1122: > >>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, > >>>> signal_voltage =0x0. > >>>> // no update sd3_bus_mode value > >>>> [ 1843.772563] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1164: > >>>> switch hs. > >>>> // next resume : the SDcard initializes to SDR104 > >>>> [ 1844.191295] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: > 1122: > >>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, > >>>> signal_voltage =0x1. > >>>> [ 1844.191315] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: > 1154: > >>>> rocr 0xc1ff8000, S18A, uhs. > >>>> [ 1844.192175] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_uhs_card: > >>>> before update: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = > >>>> 3, > >>>> card->ocr = 0x40000. > >>>> [ 1844.192187] [5: kworker/5:93: 2282] [TEST] > >> sd_update_bus_speed_mode: > >>>> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = > >>>> 0x40000. > >>>> [ 1844.198697] [5: kworker/5:93: 2282] [TEST] sd_set_bus_speed_mode: > >>>> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. > >>>> > >>>> Signed-off-by: Seunghui Lee <sh043.lee@samsung.com> > >>>> Tested-by: DooHyun Hwang <dh0421.hwang@samsung.com> > >>>> --- > >>>> drivers/mmc/core/sd.c | 47 > >>>> ++----------------------------------------- > >>>> 1 file changed, 2 insertions(+), 45 deletions(-) > >>>> > >>>> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index > >>>> cee4c0b59f43..4e3d39956185 100644 > >>>> --- a/drivers/mmc/core/sd.c > >>>> +++ b/drivers/mmc/core/sd.c > >>>> @@ -1001,18 +1001,6 @@ unsigned mmc_sd_get_max_clock(struct > >>>> mmc_card > >> *card) > >>>> return max_dtr; > >>>> } > >>>> > >>>> -static bool mmc_sd_card_using_v18(struct mmc_card *card) -{ > >>>> - /* > >>>> - * According to the SD spec., the Bus Speed Mode (function group 1) > >>>> bits > >>>> - * 2 to 4 are zero if the card is initialized at 3.3V signal level. > >>>> Thus > >>>> - * they can be used to determine if the card has already switched > >>>> to > >>>> - * 1.8V signaling. > >>>> - */ > >>>> - return card->sw_caps.sd3_bus_mode & > >>>> - (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); > >>>> -} > >>>> - > >>>> static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 > >>>> page, > >>>> u16 offset, > >>>> u8 reg_data) > >>>> { > >>>> @@ -1400,10 +1388,9 @@ static int mmc_sd_init_card(struct mmc_host > >>>> *host, > >>>> u32 ocr, > >>>> int err; > >>>> u32 cid[4]; > >>>> u32 rocr = 0; > >>>> - bool v18_fixup_failed = false; > >>>> > >>>> WARN_ON(!host->claimed); > >>>> -retry: > >>>> + > >>>> err = mmc_sd_get_cid(host, ocr, cid, &rocr); > >>>> if (err) > >>>> return err; > >>>> @@ -1472,36 +1459,6 @@ static int mmc_sd_init_card(struct mmc_host > >>>> *host, > >>>> u32 ocr, > >>>> if (err) > >>>> goto free_card; > >>>> > >>>> - /* > >>>> - * If the card has not been power cycled, it may still be using > >>>> 1.8V > >>>> - * signaling. Detect that situation and try to initialize a UHS-I > >>>> (1.8V) > >>>> - * transfer mode. > >>>> - */ > >>>> - if (!v18_fixup_failed && !mmc_host_is_spi(host) && > >>>> mmc_host_uhs(host) && > >>>> - mmc_sd_card_using_v18(card) && > >>>> - host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { > >>>> - /* > >>>> - * Re-read switch information in case it has changed since > >>>> - * oldcard was initialized. > >>>> - */ > >>>> - if (oldcard) { > >>>> - err = mmc_read_switch(card); > >>>> - if (err) > >>>> - goto free_card; > >>>> - } > >>>> - if (mmc_sd_card_using_v18(card)) { > >>>> - if (mmc_host_set_uhs_voltage(host) || > >>>> - mmc_sd_init_uhs_card(card)) { > >>>> - v18_fixup_failed = true; > >>>> - mmc_power_cycle(host, ocr); > >>>> - if (!oldcard) > >>>> - mmc_remove_card(card); > >>>> - goto retry; > >>>> - } > >>>> - goto done; > >>>> - } > >>>> - } > >>>> - > >>>> /* Initialization sequence for UHS-I cards */ > >>>> if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { > >>>> err = mmc_sd_init_uhs_card(card); @@ -1566,7 +1523,7 @@ > static > >>>> int mmc_sd_init_card(struct mmc_host *host, > >>>> u32 ocr, > >>>> err = -EINVAL; > >>>> goto free_card; > >>>> } > >>>> -done: > >>>> + > >>>> host->card = card; > >>>> return 0; > >>>> > >>>> -- > >>>> 2.29.0 > >>> > >>> Dear All, > >>> > >>> Please review this commit. > >> > >> I have started to look at it, but my time is limited at the moment. > >> > >> Note the original patch is 5 years old and fixes a real problem, so > >> we don't want to just throw it away. > >> > > > > Dear Mr. hunter, > > > > Could you check this with below patch? > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/com > > mit/drivers/mmc/core/core.c?id=147186f531ae49c18b7a9091a2c40e83b3d9564 > > 9 > > > > In the mmc_set_uhs_voltaga func(), > > once it occurs error, it has power_cycle except R1_ERROR with CMD11. > > So, When mmc_set_uhs_voltage() return error, host and card can't leave > > 1.8V voltage. > > > > Regards, > > > >>> > >>> Once the SDR104 SD card fails to switch voltage, there is no chance > >>> to work SDR104 bus speed again due to update sd3_bus_mode. > >>> > >>> To fix this regression issue, do not update sd3_bus_mode. > >>> And then it has the chance to work SDR104 again. > >>> > >>> AS-IS: > >>> voltage_switch fail -> mmc_read_switch() -> HS mode next system > >>> resume voltage switch success -> SDR25 mode > >>> > >>> TO-BE: > >>> Voltage switch fail -> HS mode > >>> Next system resume > >>> Voltage switch success -> SDR104 mode > >>> > >>> And plus, mmc_set_uhs_voltage() has power_cycle now. > >>> It means that if voltage switch fails, the card initializes 3.3V > >>> signal level. > >>> > >>> Regards, > >>> Seunghui Lee. > >>> > > > > > > Does this help? > > diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index > cee4c0b59f43..1abe8af48bfc 100644 > --- a/drivers/mmc/core/sd.c > +++ b/drivers/mmc/core/sd.c > @@ -949,15 +949,15 @@ int mmc_sd_setup_card(struct mmc_host *host, struct > mmc_card *card, > > /* Erase init depends on CSD and SSR */ > mmc_init_erase(card); > - > - /* > - * Fetch switch information from card. > - */ > - err = mmc_read_switch(card); > - if (err) > - return err; > } > > + /* > + * Fetch switch information from card. > + */ > + err = mmc_read_switch(card); > + if (err) > + return err; > + > /* > * For SPI, enable CRC as appropriate. > * This CRC enable is located AFTER the reading of the Dear Mr.Hunter, Your suggestion works well :) I've tested and verified the sd3_bus_mode's value updated. So, May I update your suggestion as patch v2? Or Would you like to your patch to contribute? Regards, Here is the test log. [ 2347.726601] [4: kworker/4:98: 2227] [TEST] mmc_sd_get_cid: ocr 0x41040000(pocr 0x40000), retries 0. [ 2347.726608] [4: kworker/4:98: 2227] mmc0: Skipping voltage switch [ 2347.932495] [4: kworker/4:98: 2227] [TEST] mmc_read_switch: sd_switch ret 0, sd3_bus_mode=0x3. [ 2347.932508] [4: kworker/4:98: 2227] [TEST] mmc_sd_init_card: 1116: caps=0x407f020f, sd3_bus_mode=0x3, v18_fixup_failed false, signal_voltage =0x0. -> sd3_bus_mode is 0x3. [ 2347.932514] [4: kworker/4:98: 2227] [TEST] mmc_sd_init_card: 1154: switch hs. [ 2347.936315] [4: kworker/4:98: 2227] [TEST] mmc_sd_init_card: 1198: card->ocr 0x40000. * next resume [ 2348.156021] [0: kworker/0:6:26086] [TEST] mmc_sd_init_card: 1037: card->ocr 0x40000. [ 2348.156065] [0: kworker/0:6:26086] [TEST] mmc_sd_get_cid: ocr 0x40000(pocr 0x40000), retries 10. [ 2348.387214] [0: kworker/0:6:26086] [TEST] mmc_read_switch: sd_switch ret 0, sd3_bus_mode=0x1f. -> sd3_bus_mode is 0x1f [ 2348.387253] [0: kworker/0:6:26086] [TEST] mmc_sd_init_card: 1116: caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage =0x1. [ 2348.387273] [0: kworker/0:6:26086] [TEST] mmc_sd_init_card: 1146: rocr 0xc1ff8000, S18A, uhs. [ 2348.388399] [0: kworker/0:6:26086] [TEST] mmc_sd_init_uhs_card: before update: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = 0x40000. [ 2348.388427] [0: kworker/0:6:26086] [TEST] sd_update_bus_speed_mode: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = 0x40000. [ 2348.390614] [0: kworker/0:6:26086] [TEST] sd_set_bus_speed_mode: sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. [ 2348.393757] [0: kworker/0:6:26086] [TEST] mmc_sd_init_card: 1198: card->ocr 0x40000.
On 10/08/22 07:24, Seunghui Lee wrote: >> -----Original Message----- >> From: Adrian Hunter <adrian.hunter@intel.com> >> Sent: Tuesday, August 9, 2022 2:37 PM >> To: Seunghui Lee <sh043.lee@samsung.com>; linux-mmc@vger.kernel.org >> Cc: 'DooHyun Hwang' <dh0421.hwang@samsung.com> >> Subject: Re: [PATCH] mmc: sd: Remove the patch that fix signal voltage >> when there is no power cycle >> >> On 8/08/22 11:24, Seunghui Lee wrote: >>>> -----Original Message----- >>>> From: Adrian Hunter <adrian.hunter@intel.com> >>>> Sent: Tuesday, July 26, 2022 7:57 PM >>>> To: Seunghui Lee <sh043.lee@samsung.com>; linux-mmc@vger.kernel.org; >>>> adrian.hunter@intel.com >>>> Cc: 'DooHyun Hwang' <dh0421.hwang@samsung.com> >>>> Subject: Re: [PATCH] mmc: sd: Remove the patch that fix signal >>>> voltage when there is no power cycle >>>> >>>> On 26/07/22 05:56, Seunghui Lee wrote: >>>>>> -----Original Message----- >>>>>> From: Seunghui Lee <sh043.lee@samsung.com> >>>>>> Sent: Thursday, July 21, 2022 2:59 PM >>>>>> To: ulf.hansson@linaro.org; linux-mmc@vger.kernel.org; >>>>>> adrian.hunter@intel.com >>>>>> Cc: Seunghui Lee <sh043.lee@samsung.com>; DooHyun Hwang >>>>>> <dh0421.hwang@samsung.com> >>>>>> Subject: [PATCH] mmc: sd: Remove the patch that fix signal voltage >>>>>> when there is no power cycle >>>>>> >>>>>> At first, all error flow of mmc_set_uhs_voltage() has power cycle >>>>>> except R1_ERROR and no start_signal_voltage_switch() func pointer. >>>>>> >>>>>> There is the performance regression issue of SDR104 SD card from >>>>>> the market VOC. Normally, once a SDR104 SD card fails to switch >>>>>> voltage, it works HS mode. >>>>>> And then it initializes SDR104 mode after system resume or error >>>> handling. >>>>>> >>>>>> However, with below patch, >>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ >>>>>> co >>>>>> mmit/ >>>>>> drivers/mmc/core/sd.c?id=6a11fc47f175c8d87018e89cb58e2d36c66534cb >>>>>> Once a SD card does, it initializes SDR25 mode forever after system >>>>>> resume or error handling(re-initialized). >>>>>> Host updates sd3_bus_mode by calling mmc_read_switch(), the value >>>>>> of sd3_bus_mode doesn't set for SDR104, SDR50 and DDR50 mode. >>>>>> >>>>>> So, if host doesn't update sd3_bus_mode, the SD card works SDR104 >>>>>> mode after system resume or error-handling. >>>>>> >>>>>> Here is an example. >>>>>> >>>>>> AS-IS : test log >>>>>> // normal case : sd3_bus_mode = 0x1F, sd_bus_speed = SDR104, clock >>>> 208MHz >>>>>> [ 111.907789] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1119: >>>>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, >>>>>> signal_voltage =0x1. >>>>>> [ 111.907824] [1: kworker/1:3: 772] [TEST] mmc_sd_init_card: 1149: >>>> rocr >>>>>> 0xc1ff8000, S18A, uhs. >>>>>> [ 111.908707] [1: kworker/1:3: 772] [TEST] >> sd_update_bus_speed_mode: >>>>>> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = >>>>>> 0x40000. >>>>>> [ 111.912484] [1: kworker/1:3: 772] [TEST] sd_set_bus_speed_mode: >>>>>> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. >>>>>> // resume : issue occurs : SDcard doesn't release busy for checking >>>>>> 10 times >>>>>> [ 112.096550] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: >>>>>> card->ocr 0x40000. >>>>>> [ 112.096560] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr >>>>>> 0x40000(pocr 0x40000), retries 10. >>>>>> ... >>>>>> [ 114.531129] [5: kworker/5:2: 207] [TEST] mmc_power_cycle. >>>>>> [ 114.579500] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr >>>>>> 0x41040000(pocr 0x40000), retries 0. >>>>>> [ 114.579506] [5: kworker/5:2: 207] mmc0: Skipping voltage switch >>>>>> [ 114.757575] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: >>>>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, >>>>>> signal_voltage =0x0. >>>>>> [ 114.757583] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1128: >>>>>> switch with oldcard. >>>>>> [ 114.759742] [5: kworker/5:2: 207] [TEST] mmc_read_switch: >>>> sd_switch >>>>>> ret 0, sd3_bus_mode=3. >>>>>> // sd3_bus_mode = 0x3 supports HS, SDR25 and SDR12 >>>>>> [ 114.759750] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1157: >>>>>> switch hs. >>>>>> // next resume : the SDcard initializes to SDR25(HS) >>>>>> mode(sd_bus_speed = 1) by sd3_bus_mode setting with clk 50MHz >>>>>> [ 114.968346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1040: >>>>>> card->ocr 0x40000. >>>>>> [ 114.968359] [5: kworker/5:2: 207] [TEST] mmc_sd_get_cid: ocr >>>>>> 0x40000(pocr 0x40000), retries 10. >>>>>> [ 115.167346] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1119: >>>>>> caps=0x407f020f, sd3_bus_mode=0x3, v18_fixup_failed false, >>>>>> signal_voltage =0x1. >>>>>> [ 115.167366] [5: kworker/5:2: 207] [TEST] mmc_sd_init_card: 1149: >>>> rocr >>>>>> 0xc1ff8000, S18A, uhs. >>>>>> [ 115.168041] [5: kworker/5:2: 207] [TEST] mmc_sd_init_uhs_card: >>>> before >>>>>> update: caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 3, >>>>>> card->ocr = 0x40000. >>>>>> [ 115.168051] [5: kworker/5:2: 207] [TEST] >> sd_update_bus_speed_mode: >>>>>> caps 0x407f020f, sd3_bus_mode = 3, sd_bus_speed = 1, card->ocr = >>>> 0x40000. >>>>>> [ 115.169176] [5: kworker/5:2: 207] [TEST] sd_set_bus_speed_mode: >>>>>> sd_bus_speed=1, timing=4, uhs_max_dtr=50000000, card->ocr=0x40000. >>>>>> >>>>>> TO-BE : TEST log with this commit >>>>>> // resume : issue occurs : SDcard doesn't release busy for checking >>>>>> 10 times >>>>>> [ 1843.594805] [4: kworker/4:5:21512] [TEST] mmc_sd_get_cid: ocr >>>>>> 0x41040000(pocr 0x40000), retries 0. >>>>>> [ 1843.594812] [4: kworker/4:5:21512] mmc0: Skipping voltage switch >>>>>> [ 1843.772555] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1122: >>>>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, >>>>>> signal_voltage =0x0. >>>>>> // no update sd3_bus_mode value >>>>>> [ 1843.772563] [4: kworker/4:5:21512] [TEST] mmc_sd_init_card: 1164: >>>>>> switch hs. >>>>>> // next resume : the SDcard initializes to SDR104 >>>>>> [ 1844.191295] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: >> 1122: >>>>>> caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, >>>>>> signal_voltage =0x1. >>>>>> [ 1844.191315] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_card: >> 1154: >>>>>> rocr 0xc1ff8000, S18A, uhs. >>>>>> [ 1844.192175] [5: kworker/5:93: 2282] [TEST] mmc_sd_init_uhs_card: >>>>>> before update: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = >>>>>> 3, >>>>>> card->ocr = 0x40000. >>>>>> [ 1844.192187] [5: kworker/5:93: 2282] [TEST] >>>> sd_update_bus_speed_mode: >>>>>> caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = >>>>>> 0x40000. >>>>>> [ 1844.198697] [5: kworker/5:93: 2282] [TEST] sd_set_bus_speed_mode: >>>>>> sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. >>>>>> >>>>>> Signed-off-by: Seunghui Lee <sh043.lee@samsung.com> >>>>>> Tested-by: DooHyun Hwang <dh0421.hwang@samsung.com> >>>>>> --- >>>>>> drivers/mmc/core/sd.c | 47 >>>>>> ++----------------------------------------- >>>>>> 1 file changed, 2 insertions(+), 45 deletions(-) >>>>>> >>>>>> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index >>>>>> cee4c0b59f43..4e3d39956185 100644 >>>>>> --- a/drivers/mmc/core/sd.c >>>>>> +++ b/drivers/mmc/core/sd.c >>>>>> @@ -1001,18 +1001,6 @@ unsigned mmc_sd_get_max_clock(struct >>>>>> mmc_card >>>> *card) >>>>>> return max_dtr; >>>>>> } >>>>>> >>>>>> -static bool mmc_sd_card_using_v18(struct mmc_card *card) -{ >>>>>> - /* >>>>>> - * According to the SD spec., the Bus Speed Mode (function group 1) >>>>>> bits >>>>>> - * 2 to 4 are zero if the card is initialized at 3.3V signal level. >>>>>> Thus >>>>>> - * they can be used to determine if the card has already switched >>>>>> to >>>>>> - * 1.8V signaling. >>>>>> - */ >>>>>> - return card->sw_caps.sd3_bus_mode & >>>>>> - (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); >>>>>> -} >>>>>> - >>>>>> static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 >>>>>> page, >>>>>> u16 offset, >>>>>> u8 reg_data) >>>>>> { >>>>>> @@ -1400,10 +1388,9 @@ static int mmc_sd_init_card(struct mmc_host >>>>>> *host, >>>>>> u32 ocr, >>>>>> int err; >>>>>> u32 cid[4]; >>>>>> u32 rocr = 0; >>>>>> - bool v18_fixup_failed = false; >>>>>> >>>>>> WARN_ON(!host->claimed); >>>>>> -retry: >>>>>> + >>>>>> err = mmc_sd_get_cid(host, ocr, cid, &rocr); >>>>>> if (err) >>>>>> return err; >>>>>> @@ -1472,36 +1459,6 @@ static int mmc_sd_init_card(struct mmc_host >>>>>> *host, >>>>>> u32 ocr, >>>>>> if (err) >>>>>> goto free_card; >>>>>> >>>>>> - /* >>>>>> - * If the card has not been power cycled, it may still be using >>>>>> 1.8V >>>>>> - * signaling. Detect that situation and try to initialize a UHS-I >>>>>> (1.8V) >>>>>> - * transfer mode. >>>>>> - */ >>>>>> - if (!v18_fixup_failed && !mmc_host_is_spi(host) && >>>>>> mmc_host_uhs(host) && >>>>>> - mmc_sd_card_using_v18(card) && >>>>>> - host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { >>>>>> - /* >>>>>> - * Re-read switch information in case it has changed since >>>>>> - * oldcard was initialized. >>>>>> - */ >>>>>> - if (oldcard) { >>>>>> - err = mmc_read_switch(card); >>>>>> - if (err) >>>>>> - goto free_card; >>>>>> - } >>>>>> - if (mmc_sd_card_using_v18(card)) { >>>>>> - if (mmc_host_set_uhs_voltage(host) || >>>>>> - mmc_sd_init_uhs_card(card)) { >>>>>> - v18_fixup_failed = true; >>>>>> - mmc_power_cycle(host, ocr); >>>>>> - if (!oldcard) >>>>>> - mmc_remove_card(card); >>>>>> - goto retry; >>>>>> - } >>>>>> - goto done; >>>>>> - } >>>>>> - } >>>>>> - >>>>>> /* Initialization sequence for UHS-I cards */ >>>>>> if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { >>>>>> err = mmc_sd_init_uhs_card(card); @@ -1566,7 +1523,7 @@ >> static >>>>>> int mmc_sd_init_card(struct mmc_host *host, >>>>>> u32 ocr, >>>>>> err = -EINVAL; >>>>>> goto free_card; >>>>>> } >>>>>> -done: >>>>>> + >>>>>> host->card = card; >>>>>> return 0; >>>>>> >>>>>> -- >>>>>> 2.29.0 >>>>> >>>>> Dear All, >>>>> >>>>> Please review this commit. >>>> >>>> I have started to look at it, but my time is limited at the moment. >>>> >>>> Note the original patch is 5 years old and fixes a real problem, so >>>> we don't want to just throw it away. >>>> >>> >>> Dear Mr. hunter, >>> >>> Could you check this with below patch? >>> >>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/com >>> mit/drivers/mmc/core/core.c?id=147186f531ae49c18b7a9091a2c40e83b3d9564 >>> 9 >>> >>> In the mmc_set_uhs_voltaga func(), >>> once it occurs error, it has power_cycle except R1_ERROR with CMD11. >>> So, When mmc_set_uhs_voltage() return error, host and card can't leave >>> 1.8V voltage. >>> >>> Regards, >>> >>>>> >>>>> Once the SDR104 SD card fails to switch voltage, there is no chance >>>>> to work SDR104 bus speed again due to update sd3_bus_mode. >>>>> >>>>> To fix this regression issue, do not update sd3_bus_mode. >>>>> And then it has the chance to work SDR104 again. >>>>> >>>>> AS-IS: >>>>> voltage_switch fail -> mmc_read_switch() -> HS mode next system >>>>> resume voltage switch success -> SDR25 mode >>>>> >>>>> TO-BE: >>>>> Voltage switch fail -> HS mode >>>>> Next system resume >>>>> Voltage switch success -> SDR104 mode >>>>> >>>>> And plus, mmc_set_uhs_voltage() has power_cycle now. >>>>> It means that if voltage switch fails, the card initializes 3.3V >>>>> signal level. >>>>> >>>>> Regards, >>>>> Seunghui Lee. >>>>> >>> >>> >> >> Does this help? >> >> diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index >> cee4c0b59f43..1abe8af48bfc 100644 >> --- a/drivers/mmc/core/sd.c >> +++ b/drivers/mmc/core/sd.c >> @@ -949,15 +949,15 @@ int mmc_sd_setup_card(struct mmc_host *host, struct >> mmc_card *card, >> >> /* Erase init depends on CSD and SSR */ >> mmc_init_erase(card); >> - >> - /* >> - * Fetch switch information from card. >> - */ >> - err = mmc_read_switch(card); >> - if (err) >> - return err; >> } >> >> + /* >> + * Fetch switch information from card. >> + */ >> + err = mmc_read_switch(card); >> + if (err) >> + return err; >> + >> /* >> * For SPI, enable CRC as appropriate. >> * This CRC enable is located AFTER the reading of the > > Dear Mr.Hunter, > > Your suggestion works well :) > I've tested and verified the sd3_bus_mode's value updated. > > So, May I update your suggestion as patch v2? > Or Would you like to your patch to contribute? I'll make a patch since there are related changes needed and I would like to do some additional testing. > > Regards, > > Here is the test log. > > [ 2347.726601] [4: kworker/4:98: 2227] [TEST] mmc_sd_get_cid: ocr 0x41040000(pocr 0x40000), retries 0. > [ 2347.726608] [4: kworker/4:98: 2227] mmc0: Skipping voltage switch > [ 2347.932495] [4: kworker/4:98: 2227] [TEST] mmc_read_switch: sd_switch ret 0, sd3_bus_mode=0x3. > [ 2347.932508] [4: kworker/4:98: 2227] [TEST] mmc_sd_init_card: 1116: caps=0x407f020f, sd3_bus_mode=0x3, v18_fixup_failed false, signal_voltage =0x0. > -> sd3_bus_mode is 0x3. > [ 2347.932514] [4: kworker/4:98: 2227] [TEST] mmc_sd_init_card: 1154: switch hs. > [ 2347.936315] [4: kworker/4:98: 2227] [TEST] mmc_sd_init_card: 1198: card->ocr 0x40000. > > * next resume > [ 2348.156021] [0: kworker/0:6:26086] [TEST] mmc_sd_init_card: 1037: card->ocr 0x40000. > [ 2348.156065] [0: kworker/0:6:26086] [TEST] mmc_sd_get_cid: ocr 0x40000(pocr 0x40000), retries 10. > [ 2348.387214] [0: kworker/0:6:26086] [TEST] mmc_read_switch: sd_switch ret 0, sd3_bus_mode=0x1f. > -> sd3_bus_mode is 0x1f > [ 2348.387253] [0: kworker/0:6:26086] [TEST] mmc_sd_init_card: 1116: caps=0x407f020f, sd3_bus_mode=0x1f, v18_fixup_failed false, signal_voltage =0x1. > [ 2348.387273] [0: kworker/0:6:26086] [TEST] mmc_sd_init_card: 1146: rocr 0xc1ff8000, S18A, uhs. > [ 2348.388399] [0: kworker/0:6:26086] [TEST] mmc_sd_init_uhs_card: before update: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = 0x40000. > [ 2348.388427] [0: kworker/0:6:26086] [TEST] sd_update_bus_speed_mode: caps 0x407f020f, sd3_bus_mode = 0x1f, sd_bus_speed = 3, card->ocr = 0x40000. > [ 2348.390614] [0: kworker/0:6:26086] [TEST] sd_set_bus_speed_mode: sd_bus_speed=3, timing=6, uhs_max_dtr=208000000, card->ocr=0x40000. > [ 2348.393757] [0: kworker/0:6:26086] [TEST] mmc_sd_init_card: 1198: card->ocr 0x40000. >
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index cee4c0b59f43..4e3d39956185 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -1001,18 +1001,6 @@ unsigned mmc_sd_get_max_clock(struct mmc_card *card) return max_dtr; } -static bool mmc_sd_card_using_v18(struct mmc_card *card) -{ - /* - * According to the SD spec., the Bus Speed Mode (function group 1) bits - * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus - * they can be used to determine if the card has already switched to - * 1.8V signaling. - */ - return card->sw_caps.sd3_bus_mode & - (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); -} - static int sd_write_ext_reg(struct mmc_card *card, u8 fno, u8 page, u16 offset, u8 reg_data) { @@ -1400,10 +1388,9 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, int err; u32 cid[4]; u32 rocr = 0; - bool v18_fixup_failed = false; WARN_ON(!host->claimed); -retry: + err = mmc_sd_get_cid(host, ocr, cid, &rocr); if (err) return err; @@ -1472,36 +1459,6 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, if (err) goto free_card; - /* - * If the card has not been power cycled, it may still be using 1.8V - * signaling. Detect that situation and try to initialize a UHS-I (1.8V) - * transfer mode. - */ - if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) && - mmc_sd_card_using_v18(card) && - host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { - /* - * Re-read switch information in case it has changed since - * oldcard was initialized. - */ - if (oldcard) { - err = mmc_read_switch(card); - if (err) - goto free_card; - } - if (mmc_sd_card_using_v18(card)) { - if (mmc_host_set_uhs_voltage(host) || - mmc_sd_init_uhs_card(card)) { - v18_fixup_failed = true; - mmc_power_cycle(host, ocr); - if (!oldcard) - mmc_remove_card(card); - goto retry; - } - goto done; - } - } - /* Initialization sequence for UHS-I cards */ if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { err = mmc_sd_init_uhs_card(card); @@ -1566,7 +1523,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, err = -EINVAL; goto free_card; } -done: + host->card = card; return 0;