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Thu, 14 Feb 2019 10:14:18 +0800 Message-ID: <1550110458.16070.30.camel@mhfsdcap03> Subject: Re: [PATCH v1] mmc: mmc: Fix HS setting in mmc_hs400_to_hs200() From: Chaotian Jing To: Ulf Hansson Date: Thu, 14 Feb 2019 10:14:18 +0800 In-Reply-To: References: <1550048812-29068-1-git-send-email-chaotian.jing@mediatek.com> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190213_181434_507639_21507D5A X-CRM114-Status: GOOD ( 25.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: srv_heupstream , Shawn Lin , "linux-mmc@vger.kernel.org" , Linux Kernel Mailing List , Adrian Hunter , linux-mediatek@lists.infradead.org, Harish Jenny K N , Hongjie Fang , Matthias Brugger , Simon Horman , Kyle Roeschley , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 2019-02-13 at 13:08 +0100, Ulf Hansson wrote: > On Wed, 13 Feb 2019 at 10:07, Chaotian Jing wrote: > > > > mmc_hs400_to_hs200() begins with the card and host in HS400 mode. > > Therefore, any commands sent to the card should use HS400 timing. > > reduce clock frequency to 50Mhz but without host timming change > > may cause CMD6 response CRC error. because host still running at > > hs400 mode, and it's hard to find a suitable setting for all eMMC > > cards when clock frequency reduced to 50Mhz but card & host still > > in hs400 mode. > > this patch refers to mmc_select_hs400(), make the reduce clock frequency > > after card timing change. > > > > Signed-off-by: Chaotian Jing > > Fixes: ef3d232245ab ("mmc: mmc: Relax checking for switch errors after HS200 switch") > > --- > > drivers/mmc/core/mmc.c | 29 +++++++++++++++++++++++------ > > 1 file changed, 23 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c > > index 09c688f..00adc2d 100644 > > --- a/drivers/mmc/core/mmc.c > > +++ b/drivers/mmc/core/mmc.c > > @@ -1239,20 +1239,37 @@ int mmc_hs400_to_hs200(struct mmc_card *card) > > int err; > > u8 val; > > > > - /* Reduce frequency to HS */ > > - max_dtr = card->ext_csd.hs_max_dtr; > > - mmc_set_clock(host, max_dtr); > > - > > /* Switch HS400 to HS DDR */ > > val = EXT_CSD_TIMING_HS; > > err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, > > val, card->ext_csd.generic_cmd6_time, 0, > > true, false, true); > > - if (err) > > - goto out_err; > > + /* > > + * as we are on the way to do re-tune, so if the CMD6 got response CRC > > + * error, do not treat it as error. > > + */ > > + if (err) { > > + if (err == -EILSEQ) { > > + /* > > + * card will busy after sending out response and host > > + * driver may not wait busy de-assert when get > > + * response CRC error. so just wait enough time to > > + * ensure card leave busy state. > > + */ > > + mmc_delay(card->ext_csd.generic_cmd6_time); > > + pr_debug("%s: %s switch to HS got CRC error\n", > > + mmc_hostname(host), __func__); > > + } else { > > + goto out_err; > > + } > > + } > > > > mmc_set_timing(host, MMC_TIMING_MMC_DDR52); > > > > + /* Reduce frequency to HS */ > > + max_dtr = card->ext_csd.hs_max_dtr; > > + mmc_set_clock(host, max_dtr); > > + > > What Adrian suggested was to not to move this part, but instead, only > allow CRC errors from the CMD6 as above. > > I guess it didn't work for you? > It should work for me. another issue is CMD6 will be sent 3 times at max err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); if the first CMD6 got response CRC error, then Host driver must wait busy signal de-assert before send the next CMD6. So that it really make sense to issue CMD6(R1B) for 3 times ? if host driver did not handle the first CMD6 response CRC error and send second CMD6 directly, then this CMD6 will get timeout due to card still in busy state. > > err = mmc_switch_status(card); > > if (err) > > goto out_err; > > -- > > 1.8.1.1.dirty > > > > Kind regards > Uffe _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel