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[98.183.112.25]) by smtp.gmail.com with ESMTPSA id k26-20020a05680808da00b003bfe05691f3sm205856oij.9.2024.02.07.06.51.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Feb 2024 06:51:34 -0800 (PST) From: David Lechner To: linux-spi@vger.kernel.org Cc: David Lechner , Mark Brown , Michael Hennerich , =?utf-8?q?Nuno_S=C3=A1?= , linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] spi: axi-spi-engine: move msg finalization out of irq handler Date: Wed, 7 Feb 2024 08:51:25 -0600 Message-ID: <20240207-axi-spi-engine-round-2-1-v2-2-40c0b4e85352@baylibre.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240207-axi-spi-engine-round-2-1-v2-0-40c0b4e85352@baylibre.com> References: <20240207-axi-spi-engine-round-2-1-v2-0-40c0b4e85352@baylibre.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mailer: b4 0.12.4 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790252881705707730 X-GMAIL-MSGID: 1790252881705707730 As a general principal, it is best to do as little as possible in an interrupt handler. This patch reworks the AXI SPI Engine driver to move timer_delete_sync() and spi_finalize_current_message() out of the interrupt handler. Instead, spi_finalize_current_message() is moved to the transfer_one_message function (similar to nearly all other SPI controllers). A completion is now used to wait for the sync interrupt that indicates that the message is complete. The watchdog timer is no longer needed since we can use the wait_for_completion_timeout() function to wait for the message to complete with the same effect. As a bonus, these changes also improve throughput of the SPI controller. For example, this was tested on a ZynqMP with a 80MHz SCLK reading 4 byte samples from an ADC. The max measured throughput increased from 26k to 28k samples per second. Reviewed-by: Nuno Sa Signed-off-by: David Lechner --- drivers/spi/spi-axi-spi-engine.c | 40 +++++++++++++++------------------------- 1 file changed, 15 insertions(+), 25 deletions(-) diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c index 606389566129..ca66d202f0e2 100644 --- a/drivers/spi/spi-axi-spi-engine.c +++ b/drivers/spi/spi-axi-spi-engine.c @@ -6,6 +6,7 @@ */ #include +#include #include #include #include @@ -13,7 +14,6 @@ #include #include #include -#include #define SPI_ENGINE_REG_RESET 0x40 @@ -109,9 +109,7 @@ struct spi_engine { spinlock_t lock; void __iomem *base; - struct timer_list watchdog_timer; - struct spi_controller *controller; - + struct completion msg_complete; unsigned int int_enable; }; @@ -483,11 +481,9 @@ static irqreturn_t spi_engine_irq(int irq, void *devid) if (pending & SPI_ENGINE_INT_SYNC && msg) { if (completed_id == AXI_SPI_ENGINE_CUR_MSG_SYNC_ID) { - if (timer_delete_sync(&spi_engine->watchdog_timer)) { - msg->status = 0; - msg->actual_length = msg->frame_length; - spi_finalize_current_message(host); - } + msg->status = 0; + msg->actual_length = msg->frame_length; + complete(&spi_engine->msg_complete); disable_int |= SPI_ENGINE_INT_SYNC; } } @@ -558,7 +554,7 @@ static int spi_engine_transfer_one_message(struct spi_controller *host, unsigned int int_enable = 0; unsigned long flags; - mod_timer(&spi_engine->watchdog_timer, jiffies + msecs_to_jiffies(5000)); + reinit_completion(&spi_engine->msg_complete); spin_lock_irqsave(&spi_engine->lock, flags); @@ -580,21 +576,16 @@ static int spi_engine_transfer_one_message(struct spi_controller *host, spi_engine->int_enable = int_enable; spin_unlock_irqrestore(&spi_engine->lock, flags); - return 0; -} - -static void spi_engine_timeout(struct timer_list *timer) -{ - struct spi_engine *spi_engine = from_timer(spi_engine, timer, watchdog_timer); - struct spi_controller *host = spi_engine->controller; - - if (WARN_ON(!host->cur_msg)) - return; + if (!wait_for_completion_timeout(&spi_engine->msg_complete, + msecs_to_jiffies(5000))) { + dev_err(&host->dev, + "Timeout occurred while waiting for transfer to complete. Hardware is probably broken.\n"); + msg->status = -ETIMEDOUT; + } - dev_err(&host->dev, - "Timeout occurred while waiting for transfer to complete. Hardware is probably broken.\n"); - host->cur_msg->status = -ETIMEDOUT; spi_finalize_current_message(host); + + return msg->status; } static void spi_engine_release_hw(void *p) @@ -625,8 +616,7 @@ static int spi_engine_probe(struct platform_device *pdev) spi_engine = spi_controller_get_devdata(host); spin_lock_init(&spi_engine->lock); - timer_setup(&spi_engine->watchdog_timer, spi_engine_timeout, TIMER_IRQSAFE); - spi_engine->controller = host; + init_completion(&spi_engine->msg_complete); spi_engine->clk = devm_clk_get_enabled(&pdev->dev, "s_axi_aclk"); if (IS_ERR(spi_engine->clk))