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SubjectRe: [PATCH v7 02/20] spi: spi-mem: allow specifying a command's extension
On 22/05/20 05:32PM, Boris Brezillon wrote:
> On Fri, 22 May 2020 15:42:43 +0530
> Pratyush Yadav <> wrote:
> > In xSPI mode, flashes expect 2-byte opcodes. The second byte is called
> > the "command extension". There can be 3 types of extensions in xSPI:
> > repeat, invert, and hex. When the extension type is "repeat", the same
> > opcode is sent twice. When it is "invert", the second byte is the
> > inverse of the opcode. When it is "hex" an additional opcode byte based
> > is sent with the command whose value can be anything.
> >
> > So, make opcode a 16-bit value and add a 'nbytes', similar to how
> > multiple address widths are handled.
> A slightly different version of patch 5 should go before this patch,
> otherwise your series is not bisectable. By slightly different, I mean
> that you should only write one byte, but put this byte in a temporary
> var. Or maybe you can squash patch 5 in this one and mention why you do
> so in your commit message.

How about the patch below before this patch? The supports_op() will
reject multi-byte opcodes anyway, so we only care about single-byte
opcodes for now. Multi-byte opcodes can be patched and tested later.
This avoids squashing changes in this patch and having the changes split
over two patches; one before and one after.

-- 8< --
diff --git a/drivers/spi/spi-mxic.c b/drivers/spi/spi-mxic.c
index 69491f3a515d..4e4292f0ee1d 100644
--- a/drivers/spi/spi-mxic.c
+++ b/drivers/spi/spi-mxic.c
@@ -356,6 +356,7 @@ static int mxic_spi_mem_exec_op(struct spi_mem *mem,
int nio = 1, i, ret;
u32 ss_ctrl;
u8 addr[8];
+ u8 opcode = op->cmd.opcode & 0xff;

ret = mxic_spi_set_freq(mxic, mem->spi->max_speed_hz);
if (ret)
@@ -393,7 +394,7 @@ static int mxic_spi_mem_exec_op(struct spi_mem *mem,
writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_ASSERT,
mxic->regs + HC_CFG);

- ret = mxic_spi_data_xfer(mxic, &op->cmd.opcode, NULL, 1);
+ ret = mxic_spi_data_xfer(mxic, &opcode, NULL, 1);
if (ret)
goto out;

Pratyush Yadav
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