From: Dmitry Osipenko <digetx@gmail.com>
To: "Thierry Reding" <thierry.reding@gmail.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Laxman Dewangan" <ldewangan@nvidia.com>,
"Wolfram Sang" <wsa@the-dreams.de>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"Andy Shevchenko" <andy.shevchenko@gmail.com>
Cc: linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v4 15/31] i2c: tegra: Remove bogus barrier()
Date: Sat, 5 Sep 2020 23:41:35 +0300 [thread overview]
Message-ID: <20200905204151.25343-16-digetx@gmail.com> (raw)
In-Reply-To: <20200905204151.25343-1-digetx@gmail.com>
Apparently barrier() was intended to reduce possibility of racing
with the interrupt handler, but driver's code evolved significantly
and today's driver enables interrupt only when it waits for completion
notification. Hence barrier() has no good use anymore, let's remove it.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/i2c/busses/i2c-tegra.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 33d37a40fa83..f69587ca163b 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -600,7 +600,6 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
i2c_dev->msg_buf_remaining = buf_remaining;
i2c_dev->msg_buf = buf +
words_to_transfer * BYTES_PER_FIFO_WORD;
- barrier();
i2c_writesl(i2c_dev, buf, I2C_TX_FIFO, words_to_transfer);
@@ -624,7 +623,6 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
/* Again update before writing to FIFO to make sure isr sees. */
i2c_dev->msg_buf_remaining = 0;
i2c_dev->msg_buf = NULL;
- barrier();
i2c_writel(i2c_dev, val, I2C_TX_FIFO);
}
--
2.27.0
next prev parent reply other threads:[~2020-09-05 20:45 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-05 20:41 [PATCH v4 00/31] Improvements for Tegra I2C driver Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 01/31] i2c: tegra: Make tegra_i2c_flush_fifos() usable in atomic transfer Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 02/31] i2c: tegra: Handle potential error of tegra_i2c_flush_fifos() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 03/31] i2c: tegra: Initialization div-clk rate unconditionally Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 04/31] i2c: tegra: Remove i2c_dev.clk_divisor_non_hs_mode member Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 05/31] i2c: tegra: Runtime PM always available on Tegra Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 06/31] i2c: tegra: Remove error message used for devm_request_irq() failure Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 07/31] i2c: tegra: Use reset_control_reset() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 08/31] i2c: tegra: Use devm_platform_get_and_ioremap_resource() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 09/31] i2c: tegra: Use platform_get_irq() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 10/31] i2c: tegra: Use clk-bulk helpers Dmitry Osipenko
2020-09-05 21:56 ` Michał Mirosław
2020-09-05 22:08 ` Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 11/31] i2c: tegra: Factor out runtime PM and hardware initialization Dmitry Osipenko
2020-09-05 22:10 ` Michał Mirosław
2020-09-05 22:24 ` Dmitry Osipenko
2020-09-05 22:51 ` Michał Mirosław
2020-09-05 23:10 ` Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 12/31] i2c: tegra: Move out all device-tree parsing into tegra_i2c_parse_dt() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 13/31] i2c: tegra: Clean up probe function Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 14/31] i2c: tegra: Remove likely/unlikely from the code Dmitry Osipenko
2020-09-05 20:41 ` Dmitry Osipenko [this message]
2020-09-05 23:35 ` [PATCH v4 15/31] i2c: tegra: Remove bogus barrier() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 16/31] i2c: tegra: Remove "dma" variable from tegra_i2c_xfer_msg() Dmitry Osipenko
2020-09-05 22:23 ` Michał Mirosław
2020-09-05 22:36 ` Dmitry Osipenko
2020-09-05 22:49 ` Michał Mirosław
2020-09-05 22:54 ` Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 17/31] i2c: tegra: Improve formatting of function variables Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 18/31] i2c: tegra: Improve coding style of tegra_i2c_wait_for_config_load() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 19/31] i2c: tegra: Rename wait/poll functions Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 20/31] i2c: tegra: Rename variable in tegra_i2c_issue_bus_clear() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 21/31] i2c: tegra: Factor out error recovery from tegra_i2c_xfer_msg() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 22/31] i2c: tegra: Factor out packet header setup " Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 23/31] i2c: tegra: Factor out register polling into separate function Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 24/31] i2c: tegra: Reorder location of functions in the code Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 25/31] i2c: tegra: Check errors for both positive and negative values Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 26/31] i2c: tegra: Consolidate error handling in tegra_i2c_xfer_msg() Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 27/31] i2c: tegra: Clean up printk messages Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 28/31] i2c: tegra: Clean up whitespaces, newlines and indentation Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 29/31] i2c: tegra: Improve driver module description Dmitry Osipenko
2020-09-05 20:41 ` [PATCH v4 30/31] i2c: tegra: Clean up and improve comments Dmitry Osipenko
2020-09-05 22:47 ` Michał Mirosław
2020-09-05 22:53 ` Dmitry Osipenko
2020-09-05 22:58 ` Michał Mirosław
2020-09-05 20:41 ` [PATCH v4 31/31] i2c: tegra: Rename couple "ret" variables to "err" Dmitry Osipenko
2020-09-05 23:16 ` [PATCH v4 00/31] Improvements for Tegra I2C driver Michał Mirosław
2020-09-05 23:35 ` Dmitry Osipenko
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