Re: GPMI iMX6ull timeout on DMA

Michael Nazzareno Trimarchi
2021-01-30T09:42:38Z

Hi Miquel

commit f8e6ad14388067f91b26d044185d95623fbc9535
Author: Michael Trimarchi <michael@amarulasolutions.com>
Date: Fri Jan 29 08:46:53 2021 +0100

mtd: nand: Calculate the clock before enable it

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Change-Id: I79b0da39de0a9b32ea0b002fa200d7f44d4f8ce7

diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c
b/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c
index 322a008290e5..0bca52b3bc8f 100644
--- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c
@@ -377,6 +377,7 @@ static void gpmi_nfc_compute_timings(struct
gpmi_nand_data *this,
const struct nand_sdr_timings *sdr)
{
struct gpmi_nfc_hardware_timing *hw = &this->hw;
+ struct resources *r = &this->resources;
unsigned int dll_threshold_ps = this->devdata->max_chain_delay;
unsigned int period_ps, reference_period_ps;
unsigned int data_setup_cycles, data_hold_cycles, addr_setup_cycles;
@@ -440,6 +441,8 @@ static void gpmi_nfc_compute_timings(struct
gpmi_nand_data *this,
hw->ctrl1n |= BF_GPMI_CTRL1_RDN_DELAY(sample_delay_factor) |
BM_GPMI_CTRL1_DLL_ENABLE |
(use_half_period ? BM_GPMI_CTRL1_HALF_PERIOD : 0);
+
+ clk_set_rate(r->clock[0], hw->clk_rate);
}

void gpmi_nfc_apply_timings(struct gpmi_nand_data *this)
@@ -449,8 +452,6 @@ void gpmi_nfc_apply_timings(struct gpmi_nand_data *this)
void __iomem *gpmi_regs = r->gpmi_regs;
unsigned int dll_wait_time_us;

- clk_set_rate(r->clock[0], hw->clk_rate);
-
writel(hw->timing0, gpmi_regs + HW_GPMI_TIMING0);
writel(hw->timing1, gpmi_regs + HW_GPMI_TIMING1);

Right now I have this change applied and seems fine. That is the only
difference I get. Clock is apply a bit earlier that when is enabled
it.

Michael

On Fri, Jan 29, 2021 at 1:43 PM Greg Ungerer <gerg@kernel.org> wrote:
>
> Hi Michael,
>
> On 28/1/21 7:45 pm, Michael Nazzareno Trimarchi wrote:
> > Hi Greg
> >
> > On Tue, Aug 13, 2019 at 2:50 AM Greg Ungerer <gerg@kernel.org> wrote:
> >>
> >> Hi Boris,
> >>
> >> On 12/8/19 5:31 pm, Boris Brezillon wrote:
> >>> On Mon, 12 Aug 2019 12:50:36 +1000
> >> [snip]
> >>> Hm, CTRL1 is identical. Can you dump all regs at the beginning and at
> >>> the end of those funcs?
> >>
> >> Here is a more complete dump of registers. Trace points are at
> >> entry and exit of the respective functions in the different
> >> kernel versions. Register dumping code is identical for both.
> >>
> >>
> >> Linux version 4.16.0 (gerg@goober) (gcc version 4.8.3 (GCC)) #10 Tue Aug 13 10:24:28 AEST 2019
> >> ...
> >
> > I ran an overnight reboot process on linux-4.19.y tag: v4.19.169 and
> > I'm not able to reproduce up to now.
> >
> > Do you have an update from your side?
>
> I haven't seen the problem for a while now.
> I pretty much only run modern kernels, I am currently using 5.10.
> So I am guessing it was resolved somewhere at some point, but I
> don't know exactly what change resolved it.
>
> Regards
> Greg
>
>
>
> >> drivers/mtd/nand/gpmi-nand/gpmi-lib.c(1073): gpmi_begin(): ENTRY
> >> HW_GPMI_CTRL0=0x00000000
> >> HW_GPMI_CTRL1=0x01c4000c
> >> HW_GPMI_COMPARE=0x00000000
> >> HW_GPMI_ECCCTRL=0x00000400
> >> HW_GPMI_ECCCOUNT=0x00000000
> >> HW_GPMI_PAYLOAD=0x00000000
> >> HW_GPMI_AUXILIARY=0x00000000
> >> HW_GPMI_TIMING0=0x00010203
> >> HW_GPMI_TIMING1=0x00000000
> >> HW_GPMI_TIMING2=0x23023336
> >> HW_GPMI_DATA=0x00000000
> >> HW_GPMI_STAT=0xff000005
> >> HW_GPMI_DEBUG=0x00000000
> >> r->clock[0]=22000000
> >> nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda
> >> nand: Micron MT29F2G08ABAEAWP
> >> nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
> >> gpmi-nand 1806000.gpmi-nand: enable the asynchronous EDO mode 5
> >> drivers/mtd/nand/gpmi-nand/gpmi-lib.c(1073): gpmi_begin(): ENTRY
> >> HW_GPMI_CTRL0=0x01800001
> >> HW_GPMI_CTRL1=0x0104000c
> >> HW_GPMI_COMPARE=0x00000000
> >> HW_GPMI_ECCCTRL=0x00000000
> >> HW_GPMI_ECCCOUNT=0x00000000
> >> HW_GPMI_PAYLOAD=0x00000000
> >> HW_GPMI_AUXILIARY=0x00000000
> >> HW_GPMI_TIMING0=0x00010203
> >> HW_GPMI_TIMING1=0x05000000
> >> HW_GPMI_TIMING2=0x23023336
> >> HW_GPMI_DATA=0x00000000
> >> HW_GPMI_STAT=0xff000005
> >> HW_GPMI_DEBUG=0x00000101
> >> r->clock[0]=99000000
> >> drivers/mtd/nand/gpmi-nand/gpmi-lib.c(1136): gpmi_begin(): EXIT
> >> HW_GPMI_CTRL0=0x01800001
> >> HW_GPMI_CTRL1=0x01c6800c
> >> HW_GPMI_COMPARE=0x00000000
> >> HW_GPMI_ECCCTRL=0x00000000
> >> HW_GPMI_ECCCOUNT=0x00000000
> >> HW_GPMI_PAYLOAD=0x00000000
> >> HW_GPMI_AUXILIARY=0x00000000
> >> HW_GPMI_TIMING0=0x00010101
> >> HW_GPMI_TIMING1=0x90000000
> >> HW_GPMI_TIMING2=0x23023336
> >> HW_GPMI_DATA=0x00000000
> >> HW_GPMI_STAT=0xff000005
> >> HW_GPMI_DEBUG=0x00000101
> >> r->clock[0]=99000000
> >> Scanning device for bad blocks
> >> 5 ofpart partitions found on MTD device gpmi-nand
> >> Creating 5 MTD partitions on "gpmi-nand":
> >> 0x000000000000-0x000000500000 : "u-boot"
> >> 0x000000500000-0x000000600000 : "u-boot-env"
> >> 0x000000600000-0x000000800000 : "log"
> >> 0x000000800000-0x000010000000 : "flash"
> >> 0x000000000000-0x000010000000 : "all"
> >> gpmi-nand 1806000.gpmi-nand: driver registered.
> >> ...
> >>
> >> Note that the first ENTRY dump has no matching EXIT dump. From the
> >> code I assume it is returning from gpmi_begin() at the
> >> "if (!hw.sample_delay_factor)" check.
> >>
> >>
> >> And for the 5.1.14 kernel:
> >>
> >> Linux version 5.1.14 (gerg@goober) (gcc version 4.8.3 (GCC)) #27 Tue Aug 13 10:20:32 AEST 2019
> >> ...
> >> drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c(512): gpmi_nfc_apply_timings(): ENTRY
> >> HW_GPMI_CTRL0=0x00000000
> >> HW_GPMI_CTRL1=0x01c4000c
> >> HW_GPMI_COMPARE=0x00000000
> >> HW_GPMI_ECCCTRL=0x00000400
> >> HW_GPMI_ECCCOUNT=0x00000000
> >> HW_GPMI_PAYLOAD=0x00000000
> >> HW_GPMI_AUXILIARY=0x00000000
> >> HW_GPMI_TIMING0=0x00010203
> >> HW_GPMI_TIMING1=0x00000000
> >> HW_GPMI_TIMING2=0x23023336
> >> HW_GPMI_DATA=0x00000000
> >> HW_GPMI_STAT=0xff000005
> >> HW_GPMI_DEBUG=0x00000000
> >> r->clock[0]=22000000
> >> drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c(536): gpmi_nfc_apply_timings(): EXIT
> >> HW_GPMI_CTRL0=0x00000000
> >> HW_GPMI_CTRL1=0x0104000c
> >> HW_GPMI_COMPARE=0x00000000
> >> HW_GPMI_ECCCTRL=0x00000400
> >> HW_GPMI_ECCCOUNT=0x00000000
> >> HW_GPMI_PAYLOAD=0x00000000
> >> HW_GPMI_AUXILIARY=0x00000000
> >> HW_GPMI_TIMING0=0x00020101
> >> HW_GPMI_TIMING1=0x60000000
> >> HW_GPMI_TIMING2=0x23023336
> >> HW_GPMI_DATA=0x00000000
> >> HW_GPMI_STAT=0xff000005
> >> HW_GPMI_DEBUG=0x00000000
> >> r->clock[0]=22000000
> >> random: fast init done
> >> nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xda
> >> nand: Micron MT29F2G08ABAEAWP
> >> nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
> >> drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c(512): gpmi_nfc_apply_timings(): ENTRY
> >> HW_GPMI_CTRL0=0x01800001
> >> HW_GPMI_CTRL1=0x0104000c
> >> HW_GPMI_COMPARE=0x00000000
> >> HW_GPMI_ECCCTRL=0x00000000
> >> HW_GPMI_ECCCOUNT=0x00000000
> >> HW_GPMI_PAYLOAD=0x00000000
> >> HW_GPMI_AUXILIARY=0x00000000
> >> HW_GPMI_TIMING0=0x00020101
> >> HW_GPMI_TIMING1=0x60000000
> >> HW_GPMI_TIMING2=0x23023336
> >> HW_GPMI_DATA=0x0000003f
> >> HW_GPMI_STAT=0xff000005
> >> HW_GPMI_DEBUG=0x00000101
> >> r->clock[0]=22000000
> >> drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c(536): gpmi_nfc_apply_timings(): EXIT
> >> HW_GPMI_CTRL0=0x01800001
> >> HW_GPMI_CTRL1=0x0104000c
> >> HW_GPMI_COMPARE=0x00000000
> >> HW_GPMI_ECCCTRL=0x00000000
> >> HW_GPMI_ECCCOUNT=0x00000000
> >> HW_GPMI_PAYLOAD=0x00000000
> >> HW_GPMI_AUXILIARY=0x00000000
> >> HW_GPMI_TIMING0=0x00020101
> >> HW_GPMI_TIMING1=0xb0000000
> >> HW_GPMI_TIMING2=0x23023336
> >> HW_GPMI_DATA=0x0000003f
> >> HW_GPMI_STAT=0xff000005
> >> HW_GPMI_DEBUG=0x00000101
> >> r->clock[0]=22000000
> >> drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c(512): gpmi_nfc_apply_timings(): ENTRY
> >> HW_GPMI_CTRL0=0x01800001
> >> HW_GPMI_CTRL1=0x0104000c
> >> HW_GPMI_COMPARE=0x00000000
> >> HW_GPMI_ECCCTRL=0x00000000
> >> HW_GPMI_ECCCOUNT=0x00000000
> >> HW_GPMI_PAYLOAD=0x00000000
> >> HW_GPMI_AUXILIARY=0x00000000
> >> HW_GPMI_TIMING0=0x00020101
> >> HW_GPMI_TIMING1=0xb0000000
> >> HW_GPMI_TIMING2=0x23023336
> >> HW_GPMI_DATA=0x000000e0
> >> HW_GPMI_STAT=0xff000005
> >> HW_GPMI_DEBUG=0x00000000
> >> r->clock[0]=22000000
> >> drivers/mtd/nand/raw/gpmi-nand/gpmi-lib.c(536): gpmi_nfc_apply_timings(): EXIT
> >> HW_GPMI_CTRL0=0x01800001
> >> HW_GPMI_CTRL1=0x01c6800c
> >> HW_GPMI_COMPARE=0x00000000
> >> HW_GPMI_ECCCTRL=0x00000000
> >> HW_GPMI_ECCCOUNT=0x00000000
> >> HW_GPMI_PAYLOAD=0x00000000
> >> HW_GPMI_AUXILIARY=0x00000000
> >> HW_GPMI_TIMING0=0x00010101
> >> HW_GPMI_TIMING1=0xe0000000
> >> HW_GPMI_TIMING2=0x23023336
> >> HW_GPMI_DATA=0x000000e0
> >> HW_GPMI_STAT=0xff000005
> >> HW_GPMI_DEBUG=0x00000000
> >> r->clock[0]=99000000
> >> Scanning device for bad blocks
> >> 5 fixed-partitions partitions found on MTD device gpmi-nand
> >> Creating 5 MTD partitions on "gpmi-nand":
> >> 0x000000000000-0x000000500000 : "u-boot"
> >> 0x000000500000-0x000000600000 : "u-boot-env"
> >> 0x000000600000-0x000000800000 : "log"
> >> 0x000000800000-0x000010000000 : "flash"
> >> 0x000000000000-0x000010000000 : "all"
> >> gpmi-nand 1806000.gpmi-nand: driver registered.
> >> ...
> >>
> >>
> >> Regards
> >> Greg
> >>
> >>
> >
> >

--
Michael Nazzareno Trimarchi
Amarula Solutions BV
COO Co-Founder
Cruquiuskade 47 Amsterdam 1018 AM NL
T. +31(0)851119172
M. +39(0)3479132170
[`as] https://www.amarulasolutions.com