[PATCH AUTOSEL 5.1 037/375] spi: atmel-quadspi: fix crash while suspending

[PATCH AUTOSEL 5.1 037/375] spi: atmel-quadspi: fix crash while suspending

[Sasha Levin]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

[ Upstream commit e5c27498a0403b270620b1a8a0a66e3efc222fb6 ]

atmel_qspi objects are kept in spi_controller objects, so, first get
pointer to spi_controller object and then get atmel_qspi object from
spi_controller object.

Fixes: 2d30ac5ed633 ("mtd: spi-nor: atmel-quadspi: Use spi-mem interface for atmel-quadspi driver")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/spi/atmel-quadspi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c
index fffc21cd5f793..b3173ebddaded 100644
--- a/drivers/spi/atmel-quadspi.c
+++ b/drivers/spi/atmel-quadspi.c
@@ -570,7 +570,8 @@ static int atmel_qspi_remove(struct platform_device *pdev)
 
 static int __maybe_unused atmel_qspi_suspend(struct device *dev)
 {
-	struct atmel_qspi *aq = dev_get_drvdata(dev);
+	struct spi_controller *ctrl = dev_get_drvdata(dev);
+	struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 
 	clk_disable_unprepare(aq->qspick);
 	clk_disable_unprepare(aq->pclk);
@@ -580,7 +581,8 @@ static int __maybe_unused atmel_qspi_suspend(struct device *dev)
 
 static int __maybe_unused atmel_qspi_resume(struct device *dev)
 {
-	struct atmel_qspi *aq = dev_get_drvdata(dev);
+	struct spi_controller *ctrl = dev_get_drvdata(dev);
+	struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
 
 	clk_prepare_enable(aq->pclk);
 	clk_prepare_enable(aq->qspick);
-- 
2.20.1

[PATCH AUTOSEL 5.1 039/375] spi: pxa2xx: fix SCR (divisor) calculation

[Sasha Levin]

From: Flavio Suligoi <f.suligoi@asem.it>

[ Upstream commit 29f2133717c527f492933b0622a4aafe0b3cbe9e ]

Calculate the divisor for the SCR (Serial Clock Rate), avoiding
that the SSP transmission rate can be greater than the device rate.

When the division between the SSP clock and the device rate generates
a reminder, we have to increment by one the divisor.
In this way the resulting SSP clock will never be greater than the
device SPI max frequency.

For example, with:

 - ssp_clk  = 50 MHz
 - dev freq = 15 MHz

without this patch the SSP clock will be greater than 15 MHz:

 - 25 MHz for PXA25x_SSP and CE4100_SSP
 - 16,56 MHz for the others

Instead, with this patch, we have in both case an SSP clock of 12.5MHz,
so the max rate of the SPI device clock is respected.

Signed-off-by: Flavio Suligoi <f.suligoi@asem.it>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/spi/spi-pxa2xx.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index b6ddba833d021..d2076f2f468f0 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -884,10 +884,14 @@ static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
 
 	rate = min_t(int, ssp_clk, rate);
 
+	/*
+	 * Calculate the divisor for the SCR (Serial Clock Rate), avoiding
+	 * that the SSP transmission rate can be greater than the device rate
+	 */
 	if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP)
-		return (ssp_clk / (2 * rate) - 1) & 0xff;
+		return (DIV_ROUND_UP(ssp_clk, 2 * rate) - 1) & 0xff;
 	else
-		return (ssp_clk / rate - 1) & 0xfff;
+		return (DIV_ROUND_UP(ssp_clk, rate) - 1)  & 0xfff;
 }
 
 static unsigned int pxa2xx_ssp_get_clk_div(struct driver_data *drv_data,
-- 
2.20.1