-----Original Message----- From: Ulf Hansson [mailto:ulf.hansson@linaro.org] Sent: 2019年2月28日 16:25 To: BOUGH CHEN haibo.chen@nxp.com Cc: adrian.hunter@intel.com; Aisheng Dong aisheng.dong@nxp.com; shawnguo@kernel.org; s.hauer@pengutronix.de; kernel@pengutronix.de; festevam@gmail.com; dl-linux-imx linux-imx@nxp.com; linux-mmc@vger.kernel.org; stable@vger.kernel.org Subject: Re: [PATCH] mmc: sdhci-esdhc-imx: correct the fix of ERR004536
On Thu, 28 Feb 2019 at 09:01, BOUGH CHEN haibo.chen@nxp.com wrote:
Commit 18094430d6b5 ("mmc: sdhci-esdhc-imx: add ADMA Length
Mismatch
errata fix") involve the fix of ERR004536, but the fix is incorrect. Double confirm with IC, need to clear the bit 7 of register 0x6c rather than set this bit 7. Here is the definition of bit 7 of 0x6c: 0: enable the new IC fix for ERR004536 1: do not use the IC fix, keep the same as before
Due to the reset value of this bit 7 is 0, ROM code and bootloader do not touch this bit 7, so here directly remove the operation of this bit 7, make sure the fix of ERR004536 can work.
Well, rather than relying on the bootloader, let the kernel do the right thing. That is, write a zero to the register bit rather than a one.
Is the code doing that?
Yes, write a zero to the register bit is correct. Why I just remove the code rather than directly write 0 to this bit is because the register 0x6c should be invisible to software, and is not defined in reference manual. It is a register only open for IC to test. If you prefer to write a zero to the register bit, I can do that.
Best Regards Haibo Chen
Kind regards Uffe
Find this issue on i.MX845s-evk board when enable CMDQ, and let system in heavy loading.
root@imx8mmevk:~# dd if=/dev/mmcblk2 of=/dev/null bs=1M & root@imx8mmevk:~# memtester 1000M > /dev/zero &
root@imx8mmevk:~# [
139.897220] mmc2: cqhci: timeout for tag 16 [ 139.901417] mmc2: cqhci: ============ CQHCI REGISTER DUMP =========== [ 139.907862] mmc2: cqhci: Caps: 0x0000310a | Version:
0x00000510
[ 139.914311] mmc2: cqhci: Config: 0x00001001 | Control:
0x00000000
[ 139.920753] mmc2: cqhci: Int stat: 0x00000000 | Int enab: 0x00000006 [ 139.927193] mmc2: cqhci: Int sig: 0x00000006 | Int Coal: 0x00000000 [ 139.933634] mmc2: cqhci: TDL base: 0x7809c000 | TDL up32:
0x00000000
[ 139.940073] mmc2: cqhci: Doorbell: 0x00030000 | TCN:
0x00000000
[ 139.946518] mmc2: cqhci: Dev queue: 0x00010000 | Dev Pend:
0x00010000
[ 139.952967] mmc2: cqhci: Task clr: 0x00000000 | SSC1:
0x00011000
[ 139.959411] mmc2: cqhci: SSC2: 0x00000001 | DCMD rsp:
0x00000000
[ 139.965857] mmc2: cqhci: RED mask: 0xfdf9a080 | TERRI:
0x00000000
[ 139.972308] mmc2: cqhci: Resp idx: 0x0000002e | Resp arg: 0x00000900 [ 139.978761] mmc2: sdhci: ============ SDHCI REGISTER DUMP =========== [ 139.985214] mmc2: sdhci: Sys addr: 0xb2c19000 | Version: 0x00000002 [ 139.991669] mmc2: sdhci: Blk size: 0x00000200 | Blk cnt: 0x00000400 [ 139.998127] mmc2: sdhci: Argument:
0x40110400 | Trn mode: 0x00000033
[ 140.004618] mmc2: sdhci: Present: 0x01088a8f | Host ctl: 0x00000030 [ 140.011113] mmc2: sdhci: Power: 0x00000002 | Blk gap:
0x00000080
[ 140.017583] mmc2: sdhci: Wake-up: 0x00000008 | Clock:
0x0000000f
[ 140.024039] mmc2: sdhci: Timeout: 0x0000008f | Int stat: 0x00000000 [ 140.030497] mmc2: sdhci: Int enab: 0x107f4000 | Sig enab: 0x107f4000 [ 140.036972] mmc2: sdhci: AC12 err: 0x00000000 | Slot int:
0x00000502
[ 140.043426] mmc2: sdhci: Caps: 0x07eb0000 | Caps_1:
0x8000b407
[ 140.049867] mmc2: sdhci: Cmd: 0x00002c1a | Max curr: 0x00ffffff [ 140.056314] mmc2: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0xffffffff [ 140.062755] mmc2: sdhci: Resp[2]: 0x328f5903 | Resp[3]:
0x00d00f00
[ 140.069195] mmc2: sdhci: Host ctl2: 0x00000008 [ 140.073640] mmc2: sdhci: ADMA Err: 0x00000007 | ADMA Ptr: 0x7809c108 [ 140.080079] mmc2: sdhci: ============================================ [ 140.086662] mmc2: running CQE recovery
Fixes commit 18094430d6b5 ("mmc: sdhci-esdhc-imx: add ADMA Length Mismatch errata fix") Signed-off-by: Haibo Chen haibo.chen@nxp.com Cc: stable@vger.kernel.org
drivers/mmc/host/sdhci-esdhc-imx.c | 6 ------ 1 file changed, 6 deletions(-)
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 32ca3703b432..5ee7613c818f 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -1171,12 +1171,6 @@ static void sdhci_esdhc_imx_hwinit(struct
sdhci_host *host)
writel(readl(host->ioaddr + SDHCI_HOST_CONTROL) | ESDHC_BURST_LEN_EN_INCR, host->ioaddr + SDHCI_HOST_CONTROL);
/** erratum ESDHC_FLAG_ERR004536 fix for MX6Q TO1.2and MX6DL
* TO1.1, it's harmless for MX6SL*/writel(readl(host->ioaddr + 0x6c) | BIT(7),host->ioaddr + 0x6c); /* disable DLL_CTRL delay line settings */ writel(0x0, host->ioaddr + ESDHC_DLL_CTRL);-- 2.17.1