[PATCH] spi: hisi-sfc-v3xx: extend version checking compatibility

[PATCH] spi: hisi-sfc-v3xx: extend version checking compatibility

[Yicong Yang]

Currently we use concrete version to determine the max_cmd_dword.
New entries should be added for compatible hardwares of new version
or on new platform, otherwise the device will use 16 dwords instead
of 64 even if it supports, which will degrade the performance.
This will decrease the compatibility and the maintainability.

Drop the switch-case statement of the version checking. Only version
less than 0x351 supports maximum 16 command dwords.

Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Acked-by: John Garry <john.garry@huawei.com>
---
 drivers/spi/spi-hisi-sfc-v3xx.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-hisi-sfc-v3xx.c b/drivers/spi/spi-hisi-sfc-v3xx.c
index 4650b48..832b80e 100644
--- a/drivers/spi/spi-hisi-sfc-v3xx.c
+++ b/drivers/spi/spi-hisi-sfc-v3xx.c
@@ -465,14 +465,10 @@ static int hisi_sfc_v3xx_probe(struct platform_device *pdev)
 
 	version = readl(host->regbase + HISI_SFC_V3XX_VERSION);
 
-	switch (version) {
-	case 0x351:
+	if (version >= 0x351)
 		host->max_cmd_dword = 64;
-		break;
-	default:
+	else
 		host->max_cmd_dword = 16;
-		break;
-	}
 
 	ret = devm_spi_register_controller(dev, ctlr);
 	if (ret)
-- 
2.8.1

Re: [PATCH] spi: hisi-sfc-v3xx: extend version checking compatibility

[Mark Brown]

On Wed, 13 Jan 2021 16:31:56 +0800, Yicong Yang wrote:
> Currently we use concrete version to determine the max_cmd_dword.
> New entries should be added for compatible hardwares of new version
> or on new platform, otherwise the device will use 16 dwords instead
> of 64 even if it supports, which will degrade the performance.
> This will decrease the compatibility and the maintainability.
> 
> Drop the switch-case statement of the version checking. Only version
> less than 0x351 supports maximum 16 command dwords.

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/1] spi: hisi-sfc-v3xx: extend version checking compatibility
      commit: 566c6120f095be74862bed35f557f797478abade

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark