Hi, Javier and Alim

These days are Spring Festival holiday.
Sorry for late reply.

On 2015/2/15 19:41, Javier Martinez Canillas wrote:

Hello Addy,

On Sat, Feb 14, 2015 at 7:17 AM, Addy Ke [off-list ref] wrote:

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patch 1: This patch can fix bug that controller is still data busy after
         reset all blocks. After this patch, I still get data busy in
         set_ios().

patch 2: This patch fix bug 'Timeout sending command'. After patch1 and
         patch2, there is no mmc errors after:
         cd /sys/bus/platform/drivers/dwmmc_rockchip
         for i in $(seq 1 10000); do
                echo "========================" $i
                echo ff0c0000.dwmmc > unbind
                sleep .5
                echo ff0c0000.dwmmc > bind
                sleep 2
        done

patch3: This patch fix bug that there is data busy before sdio send CMD53.
        But This patch is necessary for sd and mmc too.

I faced the same 'Timeout sending command' error when trying to enable
support for the SDIO wifi chip attached to mmc at 12210000 (mmc1) on an
Exynos5420 Peach Pit Chromebook. On booting the kernel log shows:

mmc_host mmc1: Timeout sending command (cmd 0x202000 arg 0x0 status 0x80202000)

0x202000 == SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT so your patch
#2 dw_mci_setup_bus() avoids the mmc comand to time out. However, it
has a side effect since with your series the uSD that in mmc at 12220000
(mmc2) fails to be detected and the kernel log shows:

[    5.466432] Waiting for root device /dev/mmcblk1p4...
[  240.169436] INFO: task kworker/u16:1:50 blocked for more than 120 seconds.
[  240.174844]       Not tainted
3.19.0-next-20150211-00006-g045d4aba96ce-dirty #476
[  240.182302] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[  240.190109] kworker/u16:1   D c04c2710     0    50      2 0x00000000
[  240.196446] Workqueue: kmmcd mmc_rescan
[  240.200249] [<c04c2710>] (__schedule) from [<c04c2ac0>] (schedule+0x34/0x98)
[  240.207290] [<c04c2ac0>] (schedule) from [<c04c6568>]
(schedule_timeout+0x120/0x16c)
[  240.215009] [<c04c6568>] (schedule_timeout) from [<c04c3584>]
(wait_for_common+0xb0/0x154)
[  240.223251] [<c04c3584>] (wait_for_common) from [<c038a5ac>]
(mmc_wait_for_req+0xa0/0x140)
[  240.231492] [<c038a5ac>] (mmc_wait_for_req) from [<c038a6d4>]
(mmc_wait_for_cmd+0x88/0xa8)
[  240.239735] [<c038a6d4>] (mmc_wait_for_cmd) from [<c03905b0>]
(mmc_go_idle+0x78/0xf8)
[  240.247540] [<c03905b0>] (mmc_go_idle) from [<c038c578>]
(mmc_rescan+0x254/0x300)
[  240.255003] [<c038c578>] (mmc_rescan) from [<c00346e8>]
(process_one_work+0x120/0x324)
[  240.262897] [<c00346e8>] (process_one_work) from [<c0034a58>]
(worker_thread+0x138/0x464)
[  240.271048] [<c0034a58>] (worker_thread) from [<c0039070>]
(kthread+0xd8/0xf4)
[  240.278254] [<c0039070>] (kthread) from [<c000e680>]
(ret_from_fork+0x14/0x34)


By enabling debug I see that the card is detected in dw_mci_get_cd() though.

Alim suggested [0] that dw_mci_wait_busy() should be called in
mci_send_cmd() instead dw_mci_setup_bus() because the controller hangs
when when sending update clock cmd in different cases.

I modified [1] your patch #2 to do what Alim suggested and only with
that patch on top of linux-next I have neither the the "Timeout
sending command" error nor the uSD not getting detected errors. Linux
mounts the rootfs from the uSD and the wifi SDIO device is enumerated
and listed in /sys/bus/sdio/devices/

Does that also solve your issue?

After merge Alim patch,and set re_try 8,
it can pass test by:
cd /sys/bus/platform/drivers/dwmmc_rockchip
for i in $(seq 1 10000); do
  echo "========================" $i
  echo ff0c0000.dwmmc > unbind
  sleep .5
  echo ff0c0000.dwmmc > bind
  sleep 2
done

My card is ADATA UHS-1 card(SDR50).
The maximum retry count is 6.

[ 1146.907596] mmc1: card 59b4 removed
[ 1147.421036] dwmmc_rockchip ff0c0000.dwmmc: Using internal DMA controller.
[ 1147.427827] dwmmc_rockchip ff0c0000.dwmmc: Version ID is 270a
[ 1147.433958] dwmmc_rockchip ff0c0000.dwmmc: DW MMC controller at irq 64, 32 bit host data width, 256 deep fifo
[ 1147.444269] dwmmc_rockchip ff0c0000.dwmmc: Got CD GPIO #221.
[ 1147.450381] dwmmc_rockchip ff0c0000.dwmmc: Got WP GPIO #226.
[ 1147.456046] ff0c0000.dwmmc supply card-external-vcc not found, using dummy regulator
[ 1148.519400] dwmmc_rockchip ff0c0000.dwmmc: Data busy (status 0x206)
[ 1149.019451] dwmmc_rockchip ff0c0000.dwmmc: Data busy (status 0x206)
[ 1149.519382] dwmmc_rockchip ff0c0000.dwmmc: Data busy (status 0x206)
[ 1150.019492] dwmmc_rockchip ff0c0000.dwmmc: Data busy (status 0x206)
[ 1150.519442] dwmmc_rockchip ff0c0000.dwmmc: Data busy (status 0x206)

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if re_try is 5, I still get "Timeout sending command".

[ 1150.525711] mmc_host mmc1: Timeout sending command (cmd 0x202000 arg 0x0 status 0x80202000)
[ 1150.534723] rockchip-iodomain io-domains.25: Setting to 3300000 done

So re_try must bigger than 6, but I don't known which value is reansonable.
Do you have any idear about it?

This is the patch Alim suggests:
+       int re_try = 8; /* just random for now, 1 re-try should be ok */

-       mci_writel(host, CMDARG, arg);
-       wmb();
-       mci_writel(host, CMD, SDMMC_CMD_START | cmd);
+       while(re_try--) {
+               mci_writel(host, CMDARG, arg);
+               wmb();
+               mci_writel(host, CMD, SDMMC_CMD_START | cmd);

-       while (time_before(jiffies, timeout)) {
-               cmd_status = mci_readl(host, CMD);
-               if (!(cmd_status & SDMMC_CMD_START))
-                       return;
+               while (time_before(jiffies, timeout)) {
+                       cmd_status = mci_readl(host, CMD);
+                       if (!(cmd_status & SDMMC_CMD_START))
+                               return;
+               }
+
+               dw_mci_wait_busy(slot);

Best regards,
Javier

[0]: https://lkml.org/lkml/2015/2/10/353
[1]: http://paste.debian.net/plain/148794