From: dillon.minfei@gmail.com
To: patrice.chotard@foss.st.com, pierre-yves.mordret@foss.st.com,
alain.volmat@foss.st.com, mcoquelin.stm32@gmail.com,
alexandre.torgue@foss.st.com, sumit.semwal@linaro.org,
christian.koenig@amd.com, mturquette@baylibre.com
Cc: sboyd@kernel.org, linux-i2c@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org,
linux-clk@vger.kernel.org, Dillon Min <dillon.minfei@gmail.com>
Subject: [PATCH 2/4] i2c: stm32f4: Fix stmpe811 get xyz data timeout issue
Date: Fri, 14 May 2021 19:02:30 +0800 [thread overview]
Message-ID: <1620990152-19255-3-git-send-email-dillon.minfei@gmail.com> (raw)
In-Reply-To: <1620990152-19255-1-git-send-email-dillon.minfei@gmail.com>
From: Dillon Min <dillon.minfei@gmail.com>
As stm32f429's internal flash is 2Mbytes and compiled kernel
image bigger than 2Mbytes, so we have to load kernel image
to sdram on stm32f429-disco board which has 8Mbytes sdram space.
based on above context, as you knows kernel running on external
sdram is more slower than internal flash. besides, we need read 4
bytes to get touch screen xyz(x, y, pressure) coordinate data in
stmpe811 interrupt.
so, in stm32f4_i2c_handle_rx_done, as i2c read slower than running
in xip mode, have to adjust 'STOP/START bit set position' from last
two bytes to last one bytes. else, will get i2c timeout in reading
touch screen coordinate.
to not bring in side effect, introduce IIC_LAST_BYTE_POS to support xip
kernel or zImage.
Fixes: 62817fc8d282 ("i2c: stm32f4: add driver")
Link: https://lore.kernel.org/lkml/1591709203-12106-5-git-send-email-dillon.minfei@gmail.com/
Signed-off-by: Dillon Min <dillon.minfei@gmail.com>
---
drivers/i2c/busses/i2c-stm32f4.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/i2c/busses/i2c-stm32f4.c b/drivers/i2c/busses/i2c-stm32f4.c
index 4933fc8ce3fd..2e41231b9037 100644
--- a/drivers/i2c/busses/i2c-stm32f4.c
+++ b/drivers/i2c/busses/i2c-stm32f4.c
@@ -93,6 +93,12 @@
#define STM32F4_I2C_MAX_FREQ 46U
#define HZ_TO_MHZ 1000000
+#if !defined(CONFIG_MMU) && !defined(CONFIG_XIP_KERNEL)
+#define IIC_LAST_BYTE_POS 1
+#else
+#define IIC_LAST_BYTE_POS 2
+#endif
+
/**
* struct stm32f4_i2c_msg - client specific data
* @addr: 8-bit slave addr, including r/w bit
@@ -439,7 +445,7 @@ static void stm32f4_i2c_handle_rx_done(struct stm32f4_i2c_dev *i2c_dev)
int i;
switch (msg->count) {
- case 2:
+ case IIC_LAST_BYTE_POS:
/*
* In order to correctly send the Stop or Repeated Start
* condition on the I2C bus, the STOP/START bit has to be set
@@ -454,7 +460,7 @@ static void stm32f4_i2c_handle_rx_done(struct stm32f4_i2c_dev *i2c_dev)
else
stm32f4_i2c_set_bits(reg, STM32F4_I2C_CR1_START);
- for (i = 2; i > 0; i--)
+ for (i = IIC_LAST_BYTE_POS; i > 0; i--)
stm32f4_i2c_read_msg(i2c_dev);
reg = i2c_dev->base + STM32F4_I2C_CR2;
@@ -463,7 +469,7 @@ static void stm32f4_i2c_handle_rx_done(struct stm32f4_i2c_dev *i2c_dev)
complete(&i2c_dev->complete);
break;
- case 3:
+ case (IIC_LAST_BYTE_POS+1):
/*
* In order to correctly generate the NACK pulse after the last
* received data byte, we have to enable NACK before reading N-2
--
2.7.4
next prev parent reply other threads:[~2021-05-14 11:02 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-14 11:02 [PATCH 0/4] Fix the i2c/clk bug of stm32 mcu platform dillon.minfei
2021-05-14 11:02 ` [PATCH 1/4] drm/panel: Add ilitek ili9341 panel driver dillon.minfei
2021-05-31 13:15 ` Patrice CHOTARD
2021-05-31 13:39 ` Dillon Min
2021-06-01 2:31 ` Dillon Min
2021-05-14 11:02 ` dillon.minfei [this message]
2021-06-01 11:43 ` [PATCH 2/4] i2c: stm32f4: Fix stmpe811 get xyz data timeout issue Patrice CHOTARD
2021-06-01 11:58 ` Dillon Min
2021-05-14 11:02 ` [PATCH 3/4] clk: stm32: Fix stm32f429's ltdc driver hang in set clock rate dillon.minfei
2021-06-01 12:48 ` Patrice CHOTARD
2021-05-14 11:02 ` [PATCH 4/4] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after kernel startup dillon.minfei
2021-06-01 12:51 ` Patrice CHOTARD
2021-05-28 6:01 ` [PATCH 0/4] Fix the i2c/clk bug of stm32 mcu platform Dillon Min
2021-05-31 13:20 ` Patrice CHOTARD
2021-05-31 13:38 ` Dillon Min
2021-05-31 13:50 ` Patrice CHOTARD
2021-05-31 14:29 ` Dillon Min
2021-05-31 14:58 ` Patrice CHOTARD
2021-06-01 3:28 ` Dillon Min
2021-06-01 8:00 ` Patrice CHOTARD
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