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From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: Mark Brown <broonie@kernel.org>
Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru>,
	Serge Semin <fancer.lancer@gmail.com>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Ramil Zaripov <Ramil.Zaripov@baikalelectronics.ru>,
	Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Lars Povlsen <lars.povlsen@microchip.com>,
	"wuxu . wu" <wuxu.wu@huawei.com>, Feng Tang <feng.tang@intel.com>,
	Rob Herring <robh+dt@kernel.org>, <linux-spi@vger.kernel.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v2 11/21] spi: dw: Unmask IRQs after enabling the chip
Date: Wed, 30 Sep 2020 21:55:35 +0300	[thread overview]
Message-ID: <20200930185545.29959-12-Sergey.Semin@baikalelectronics.ru> (raw)
In-Reply-To: <20200930185545.29959-1-Sergey.Semin@baikalelectronics.ru>

It's theoretically erroneous to enable IRQ before the chip is turned on.
If IRQ handler gets executed before the chip is enabled, then any data
written to the Tx FIFO will be just ignored.

I say "theoretically" because we haven't noticed any problem with that,
but let's fix it anyway just in case...

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
---
 drivers/spi/spi-dw-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index db3fec4195f7..58a7c7465c61 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -376,8 +376,6 @@ static int dw_spi_transfer_one(struct spi_controller *master,
 			spi_enable_chip(dws, 1);
 			return ret;
 		}
-	} else {
-		dw_spi_irq_setup(dws);
 	}
 
 	spi_enable_chip(dws, 1);
@@ -385,6 +383,8 @@ static int dw_spi_transfer_one(struct spi_controller *master,
 	if (dws->dma_mapped)
 		return dws->dma_ops->dma_transfer(dws, transfer);
 
+	dw_spi_irq_setup(dws);
+
 	return 1;
 }
 
-- 
2.27.0


  parent reply	other threads:[~2020-09-30 18:56 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-30 18:55 [PATCH v2 00/21] spi: dw: Add full Baikal-T1 SPI Controllers support Serge Semin
2020-09-30 18:55 ` [PATCH v2 01/21] spi: dw: Use an explicit set_cs assignment Serge Semin
2020-09-30 18:55 ` [PATCH v2 02/21] spi: dw: Add DWC SSI capability Serge Semin
2020-10-01 21:51   ` Mark Brown
2020-10-01 21:55     ` Serge Semin
2020-09-30 18:55 ` [PATCH v2 03/21] spi: dw: Detach SPI device specific CR0 config method Serge Semin
2020-09-30 18:55 ` [PATCH v2 04/21] spi: dw: Update SPI bus speed in a config function Serge Semin
2020-09-30 18:55 ` [PATCH v2 05/21] spi: dw: Simplify the SPI bus speed config procedure Serge Semin
2020-09-30 18:55 ` [PATCH v2 06/21] spi: dw: Update Rx sample delay in the config function Serge Semin
2020-09-30 18:55 ` [PATCH v2 07/21] spi: dw: Add DW SPI controller config structure Serge Semin
2020-09-30 18:55 ` [PATCH v2 08/21] spi: dw: Refactor data IO procedure Serge Semin
2020-09-30 18:55 ` [PATCH v2 09/21] spi: dw: Refactor IRQ-based SPI transfer procedure Serge Semin
2020-09-30 18:55 ` [PATCH v2 10/21] spi: dw: Perform IRQ setup in a dedicated function Serge Semin
2020-09-30 18:55 ` Serge Semin [this message]
2020-09-30 18:55 ` [PATCH v2 12/21] spi: dw: Discard chip enabling on DMA setup error Serge Semin
2020-09-30 18:55 ` [PATCH v2 13/21] spi: dw: De-assert chip-select on reset Serge Semin
2020-09-30 18:55 ` [PATCH v2 14/21] spi: dw: Explicitly de-assert CS on SPI transfer completion Serge Semin
2020-09-30 18:55 ` [PATCH v2 15/21] spi: dw: Move num-of retries parameter to the header file Serge Semin
2020-09-30 18:55 ` [PATCH v2 16/21] spi: dw: Add generic DW SSI status-check method Serge Semin
2020-09-30 18:55 ` [PATCH v2 17/21] spi: dw: Add memory operations support Serge Semin
2020-09-30 18:55 ` [PATCH v2 18/21] spi: dw: Introduce max mem-ops SPI bus frequency setting Serge Semin
2020-09-30 18:55 ` [PATCH v2 19/21] spi: dw: Add poll-based SPI transfers support Serge Semin
2020-09-30 18:55 ` [PATCH v2 20/21] dt-bindings: spi: dw: Add Baikal-T1 SPI Controllers Serge Semin
2020-09-30 18:55 ` [PATCH v2 21/21] spi: dw: Add Baikal-T1 SPI Controller glue driver Serge Semin

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