(unknown)

(unknown)

[Michael J. Weirsky]

-- 
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$273million Jackpot in March 8, 2019. I donate $1.000.000,00 to you. 
Contact me via email: micjsky-YDxpq3io04c@public.gmane.org for info / claim.
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(unknown)

[Rajat Jain]

From: Evan Green <evgreen-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>

Date: Wed, 29 Jan 2020 13:54:16 -0800
Subject: [PATCH] spi: pxa2xx: Add CS control clock quirk

In some circumstances on Intel LPSS controllers, toggling the LPSS
CS control register doesn't actually cause the CS line to toggle.
This seems to be failure of dynamic clock gating that occurs after
going through a suspend/resume transition, where the controller
is sent through a reset transition. This ruins SPI transactions
that either rely on delay_usecs, or toggle the CS line without
sending data.

Whenever CS is toggled, momentarily set the clock gating register
to "Force On" to poke the controller into acting on CS.

Signed-off-by: Evan Green <evgreen-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Signed-off-by: Rajat Jain <rajatja-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
---
 drivers/spi/spi-pxa2xx.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 4c7a71f0fb3e..2e318158fca9 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -70,6 +70,10 @@ MODULE_ALIAS("platform:pxa2xx-spi");
 #define LPSS_CAPS_CS_EN_SHIFT			9
 #define LPSS_CAPS_CS_EN_MASK			(0xf << LPSS_CAPS_CS_EN_SHIFT)
 
+#define LPSS_PRIV_CLOCK_GATE 0x38
+#define LPSS_PRIV_CLOCK_GATE_CLK_CTL_MASK 0x3
+#define LPSS_PRIV_CLOCK_GATE_CLK_CTL_FORCE_ON 0x3
+
 struct lpss_config {
 	/* LPSS offset from drv_data->ioaddr */
 	unsigned offset;
@@ -86,6 +90,8 @@ struct lpss_config {
 	unsigned cs_sel_shift;
 	unsigned cs_sel_mask;
 	unsigned cs_num;
+	/* Quirks */
+	unsigned cs_clk_stays_gated : 1;
 };
 
 /* Keep these sorted with enum pxa_ssp_type */
@@ -156,6 +162,7 @@ static const struct lpss_config lpss_platforms[] = {
 		.tx_threshold_hi = 56,
 		.cs_sel_shift = 8,
 		.cs_sel_mask = 3 << 8,
+		.cs_clk_stays_gated = true,
 	},
 };
 
@@ -383,6 +390,22 @@ static void lpss_ssp_cs_control(struct spi_device *spi, bool enable)
 	else
 		value |= LPSS_CS_CONTROL_CS_HIGH;
 	__lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value);
+	if (config->cs_clk_stays_gated) {
+		u32 clkgate;
+
+		/*
+		 * Changing CS alone when dynamic clock gating is on won't
+		 * actually flip CS at that time. This ruins SPI transfers
+		 * that specify delays, or have no data. Toggle the clock mode
+		 * to force on briefly to poke the CS pin to move.
+		 */
+		clkgate = __lpss_ssp_read_priv(drv_data, LPSS_PRIV_CLOCK_GATE);
+		value = (clkgate & ~LPSS_PRIV_CLOCK_GATE_CLK_CTL_MASK) |
+			LPSS_PRIV_CLOCK_GATE_CLK_CTL_FORCE_ON;
+
+		__lpss_ssp_write_priv(drv_data, LPSS_PRIV_CLOCK_GATE, value);
+		__lpss_ssp_write_priv(drv_data, LPSS_PRIV_CLOCK_GATE, clkgate);
+	}
 }
 
 static void cs_assert(struct spi_device *spi)
-- 
2.25.0.225.g125e21ebc7-goog

(unknown),

[bflove1-ntQ8I44N4zM]

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(unknown),

[janepatrick00-VmEwxm1hRrAnxqbYAscKCQ]

Hello,
My name is Jane from UK, I came across you email address online, I will like to know more about you , I have a very important reason of contacting you which, I'll tell you in my next mail.
I wait for your reply
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(unknown),

[bflove1-ntQ8I44N4zM]

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(unknown)

[David Howells]

Nicolas Dichtel <nicolas.dichtel@6wind.com> wrote:

> This header file is exported, thus move it to uapi.

Exported how?

> +#ifdef __INT32_TYPE__
> +#undef __INT32_TYPE__
> +#define __INT32_TYPE__		int
> +#endif
> +
> +#ifdef __UINT32_TYPE__
> +#undef __UINT32_TYPE__
> +#define __UINT32_TYPE__	unsigned int
> +#endif
> +
> +#ifdef __UINTPTR_TYPE__
> +#undef __UINTPTR_TYPE__
> +#define __UINTPTR_TYPE__	unsigned long
> +#endif

These weren't defined by the kernel before, so why do we need to define them
now?

Will defining __UINTPTR_TYPE__ cause problems in compiling libboost by
changing the signature on C++ functions that use uintptr_t?

David

(unknown)

[MRS GRACE MANDA]

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This is Mrs Grace Manda (  Please I need your Help is Urgent).






This is Mrs Grace Manda (  Please I need your Help is Urgent). 

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(unknown)

[Jorge Ventura]

unsubscribe linux-spi
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(unknown),

[Karicheri, Muralidharan]

subscribe spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org

Murali Karicheri
Software Design Engineer

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