| Message ID | 20241218165850.378909-1-csokas.bence@prolan.hu (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | spi: atmel-qspi: Memory barriers after memory-mapped I/O | expand |
Right. I originally planned on splitting it into a cover letter and then the patch, but I guess everything can just go into the msg. Dropping the --- Bence On 2024. 12. 18. 18:01, Mark Brown wrote: > On Wed, Dec 18, 2024 at 05:58:49PM +0100, Bence Csókás wrote: > >> However, the current documentation makes no mention to >> synchronization requirements in the other direction, i.e. >> after the last data written via AHB, and before the first >> register access on APB. >> >> --- >> >> Fixes: d5433def3153 ("mtd: spi-nor: atmel-quadspi: Add spi-mem support to atmel-quadspi") >> Cc: Hari.PrasathGE@microchip.com >> Cc: Mahesh.Abotula@microchip.com >> Cc: Marco.Cardellini@microchip.com >> Cc: <stable@vger.kernel.org> # c0a0203cf579: ("spi: atmel-quadspi: Create `atmel_qspi_ops`"...) >> Cc: <stable@vger.kernel.org> # 6.x.y >> Signed-off-by: Bence Csókás <csokas.bence@prolan.hu> >> --- > > Your signoffs and whatnot need to go before the --- so they don't get > cut off by tools, any any ancilliary stuff should go after.
diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c index 73cf0c3f1477..96fc1c56a221 100644 --- a/drivers/spi/atmel-quadspi.c +++ b/drivers/spi/atmel-quadspi.c @@ -625,13 +625,20 @@ static int atmel_qspi_transfer(struct spi_mem *mem, (void)atmel_qspi_read(aq, QSPI_IFR); /* Send/Receive data */ - if (op->data.dir == SPI_MEM_DATA_IN) + if (op->data.dir == SPI_MEM_DATA_IN) { memcpy_fromio(op->data.buf.in, aq->mem + offset, op->data.nbytes); - else + + /* Synchronize AHB and APB accesses again */ + rmb(); + } else { memcpy_toio(aq->mem + offset, op->data.buf.out, op->data.nbytes); + /* Synchronize AHB and APB accesses again */ + wmb(); + } + /* Release the chip-select */ atmel_qspi_write(QSPI_CR_LASTXFER, aq, QSPI_CR);
The QSPI peripheral control and status registers are accessible via the SoC's APB bus, whereas MMIO transactions' data travels on the AHB bus. Microchip documentation and even sample code from Atmel emphasises the need for a memory barrier before the first MMIO transaction to the AHB-connected QSPI, and before the last write to its registers via APB. This is achieved by the following lines in `atmel_qspi_transfer()`: /* Dummy read of QSPI_IFR to synchronize APB and AHB accesses */ (void)atmel_qspi_read(aq, QSPI_IFR); However, the current documentation makes no mention to synchronization requirements in the other direction, i.e. after the last data written via AHB, and before the first register access on APB. --- In our case, we were facing an issue where the QSPI peripheral would cease to send any new CSR (nCS Rise) interrupts, leading to a timeout in `atmel_qspi_wait_for_completion()` and ultimately this panic in higher levels: ubi0 error: ubi_io_write: error -110 while writing 63108 bytes to PEB 491:128, written 63104 bytes After months of extensive research of the codebase, fiddling around the debugger with kgdb, and back-and-forth with Microchip, we came to the conclusion that the issue is probably that the peripheral is still busy receiving on AHB when the LASTXFER bit is written to its Control Register on APB, therefore this write gets lost, and the peripheral still thinks there is more data to come in the MMIO transfer. This was first formulated when we noticed that doubling the write() of QSPI_CR_LASTXFER seemed to solve the problem. Ultimately, the solution is to introduce memory barriers after the AHB-mapped MMIO transfers, to ensure ordering. Fixes: d5433def3153 ("mtd: spi-nor: atmel-quadspi: Add spi-mem support to atmel-quadspi") Cc: Hari.PrasathGE@microchip.com Cc: Mahesh.Abotula@microchip.com Cc: Marco.Cardellini@microchip.com Cc: <stable@vger.kernel.org> # c0a0203cf579: ("spi: atmel-quadspi: Create `atmel_qspi_ops`"...) Cc: <stable@vger.kernel.org> # 6.x.y Signed-off-by: Bence Csókás <csokas.bence@prolan.hu> --- drivers/spi/atmel-quadspi.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)