[U-Boot] [PATCH v2 0/5] Add wait_for_bit()

[U-Boot] [PATCH v2 0/5] Add wait_for_bit()

[Mateusz Kulikowski]

Changes in V2:
- wait_bit.o is always compiled in
- Removed CONFIG_LIB_WAIT_BIT from configs/Kconfigs
- Constified arguments to wait_bit
- Removed check for CONFIG_... in drivers
- Added tested-by to ohci-lp32xx
@Sylvain Lemieux: I didn't changed driver logic with v2,
so allowed myself to add your tested-by directly.

Tested on:
 - USB driver on Dragonboard (not yet in mainline)
 - Infinite sleep (if timeout/interruption works)
Build tested on single board for each driver/commit:
- hikey
- zynq_microzed
- platinum

(Old) notes from V1:

This series add generic function to poll register waiting for
one or more bits to change.

Very similar function was used in several drivers:
- dwc2
- ohci-lp32xx
- ehci-mx6
- zynq_gem

First patch adds function, following patches update drivers and
board config files / defconfigs.

This series was compile-tested with buildman for ~50 boards
(most or even all boards affected by change)

Code was also run-tested on ehci-msm driver (not yet in mainline)

There is single difference in behavior: ohci-lp32xx driver will
not print "Timeout..." message with debug disabled.
I think it's not a big issue as this driver seems unused, but
if it's an issue - please drop that patch.


Mateusz Kulikowski (5):
  lib: Add wait_for_bit
  usb: dwc2: Use shared wait_for_bit
  usb: ohci-lpc32xx: Use shared wait_for_bit
  usb: ehci-mx6: Use shared wait_for_bit
  net: zynq_gem: Use shared wait_for_bit

 drivers/net/zynq_gem.c          | 35 ++------------------------------
 drivers/usb/host/dwc2.c         | 41 ++++++++++++-------------------------
 drivers/usb/host/ehci-mx6.c     | 32 ++++-------------------------
 drivers/usb/host/ohci-lpc32xx.c | 34 +++++++------------------------
 include/wait_bit.h              | 35 ++++++++++++++++++++++++++++++++
 lib/Makefile                    |  1 +
 lib/wait_bit.c                  | 45 +++++++++++++++++++++++++++++++++++++++++
 7 files changed, 107 insertions(+), 116 deletions(-)
 create mode 100644 include/wait_bit.h
 create mode 100644 lib/wait_bit.c

-- 
2.5.0

[U-Boot] [PATCH v2 1/5] lib: Add wait_for_bit

[Mateusz Kulikowski]

Add function to poll register waiting for specific bit(s).
Similar functions are implemented in few drivers - they are almost
identical and can be generalized.

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
---

 include/wait_bit.h | 35 +++++++++++++++++++++++++++++++++++
 lib/Makefile       |  1 +
 lib/wait_bit.c     | 45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 81 insertions(+)
 create mode 100644 include/wait_bit.h
 create mode 100644 lib/wait_bit.c

diff --git a/include/wait_bit.h b/include/wait_bit.h
new file mode 100644
index 0000000..052a09b
--- /dev/null
+++ b/include/wait_bit.h
@@ -0,0 +1,35 @@
+/*
+ * Wait for bit with timeout and ctrlc
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __WAIT_BIT_H
+#define __WAIT_BIT_H
+
+/**
+ * wait_for_bit()	waits for bit set/cleared in register
+ *
+ * Function polls register waiting for specific bit(s) change
+ * (either 0->1 or 1->0). It can fail under two conditions:
+ * - Timeout
+ * - User interaction (CTRL-C)
+ * Function succeeds only if all bits of masked register are set/cleared
+ * (depending on set option).
+ *
+ * @param prefix	Prefix added to timeout messagge (message visible only
+ *			with debug enabled)
+ * @param reg		Register that will be read (using readl())
+ * @param mask		Bit(s) of register that must be active
+ * @param set		Selects wait condition (bit set or clear)
+ * @param timeout	Timeout (in miliseconds)
+ * @param breakable	Enables CTRL-C interruption
+ * @return		0 on success, -ETIMEDOUT or -EINTR on failure
+ */
+int wait_for_bit(const char *prefix, const u32 *reg, const u32 mask,
+		 const bool set, const unsigned int timeout,
+		 const bool breakable);
+
+#endif
diff --git a/lib/Makefile b/lib/Makefile
index 1f1ff6f..6fe3ab5 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -81,6 +81,7 @@ obj-y += time.o
 obj-$(CONFIG_TRACE) += trace.o
 obj-$(CONFIG_LIB_UUID) += uuid.o
 obj-$(CONFIG_LIB_RAND) += rand.o
+obj-y += wait_bit.o
 
 ifdef CONFIG_SPL_BUILD
 # SPL U-Boot may use full-printf, tiny-printf or none at all
diff --git a/lib/wait_bit.c b/lib/wait_bit.c
new file mode 100644
index 0000000..ac35f68
--- /dev/null
+++ b/lib/wait_bit.c
@@ -0,0 +1,45 @@
+/*
+ * Wait for bit interruptible by timeout or ctrlc
+ *
+ * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <console.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+
+int wait_for_bit(const char *prefix, const u32 *reg, const u32 mask,
+		 const bool set, const unsigned int timeout,
+		 const bool breakable)
+{
+	u32 val;
+	unsigned long start = get_timer(0);
+
+	while (1) {
+		val = readl(reg);
+
+		if (!set)
+			val = ~val;
+
+		if ((val & mask) == mask)
+			return 0;
+
+		if (get_timer(start) > timeout)
+			break;
+
+		if (breakable && ctrlc()) {
+			puts("Abort\n");
+			return -EINTR;
+		}
+
+		udelay(1);
+	}
+
+	debug("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n", prefix, reg, mask,
+	      set);
+
+	return -ETIMEDOUT;
+}
-- 
2.5.0

[U-Boot] [PATCH v2 2/5] usb: dwc2: Use shared wait_for_bit

[Mateusz Kulikowski]

Use existing library function to poll bit(s).

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
---

 drivers/usb/host/dwc2.c | 41 +++++++++++++----------------------------
 1 file changed, 13 insertions(+), 28 deletions(-)

diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
index 541c0f9..42d31e3 100644
--- a/drivers/usb/host/dwc2.c
+++ b/drivers/usb/host/dwc2.c
@@ -13,6 +13,7 @@
 #include <memalign.h>
 #include <phys2bus.h>
 #include <usbroothubdes.h>
+#include <wait_bit.h>
 #include <asm/io.h>
 
 #include "dwc2.h"
@@ -52,27 +53,6 @@ static struct dwc2_priv local;
 /*
  * DWC2 IP interface
  */
-static int wait_for_bit(void *reg, const uint32_t mask, bool set)
-{
-	unsigned int timeout = 1000000;
-	uint32_t val;
-
-	while (--timeout) {
-		val = readl(reg);
-		if (!set)
-			val = ~val;
-
-		if ((val & mask) == mask)
-			return 0;
-
-		udelay(1);
-	}
-
-	debug("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n",
-	      __func__, reg, mask, set);
-
-	return -ETIMEDOUT;
-}
 
 /*
  * Initializes the FSLSPClkSel field of the HCFG register
@@ -117,7 +97,8 @@ static void dwc_otg_flush_tx_fifo(struct dwc2_core_regs *regs, const int num)
 
 	writel(DWC2_GRSTCTL_TXFFLSH | (num << DWC2_GRSTCTL_TXFNUM_OFFSET),
 	       &regs->grstctl);
-	ret = wait_for_bit(&regs->grstctl, DWC2_GRSTCTL_TXFFLSH, 0);
+	ret = wait_for_bit(__func__, &regs->grstctl, DWC2_GRSTCTL_TXFFLSH,
+			   false, 1000, false);
 	if (ret)
 		printf("%s: Timeout!\n", __func__);
 
@@ -135,7 +116,8 @@ static void dwc_otg_flush_rx_fifo(struct dwc2_core_regs *regs)
 	int ret;
 
 	writel(DWC2_GRSTCTL_RXFFLSH, &regs->grstctl);
-	ret = wait_for_bit(&regs->grstctl, DWC2_GRSTCTL_RXFFLSH, 0);
+	ret = wait_for_bit(__func__, &regs->grstctl, DWC2_GRSTCTL_RXFFLSH,
+			   false, 1000, false);
 	if (ret)
 		printf("%s: Timeout!\n", __func__);
 
@@ -152,13 +134,15 @@ static void dwc_otg_core_reset(struct dwc2_core_regs *regs)
 	int ret;
 
 	/* Wait for AHB master IDLE state. */
-	ret = wait_for_bit(&regs->grstctl, DWC2_GRSTCTL_AHBIDLE, 1);
+	ret = wait_for_bit(__func__, &regs->grstctl, DWC2_GRSTCTL_AHBIDLE,
+			   true, 1000, false);
 	if (ret)
 		printf("%s: Timeout!\n", __func__);
 
 	/* Core Soft Reset */
 	writel(DWC2_GRSTCTL_CSFTRST, &regs->grstctl);
-	ret = wait_for_bit(&regs->grstctl, DWC2_GRSTCTL_CSFTRST, 0);
+	ret = wait_for_bit(__func__, &regs->grstctl, DWC2_GRSTCTL_CSFTRST,
+			   false, 1000, false);
 	if (ret)
 		printf("%s: Timeout!\n", __func__);
 
@@ -243,8 +227,8 @@ static void dwc_otg_core_host_init(struct dwc2_core_regs *regs)
 		clrsetbits_le32(&regs->hc_regs[i].hcchar,
 				DWC2_HCCHAR_EPDIR,
 				DWC2_HCCHAR_CHEN | DWC2_HCCHAR_CHDIS);
-		ret = wait_for_bit(&regs->hc_regs[i].hcchar,
-				   DWC2_HCCHAR_CHEN, 0);
+		ret = wait_for_bit(__func__, &regs->hc_regs[i].hcchar,
+				   DWC2_HCCHAR_CHEN, false, 1000, false);
 		if (ret)
 			printf("%s: Timeout!\n", __func__);
 	}
@@ -737,7 +721,8 @@ int wait_for_chhltd(struct dwc2_core_regs *regs, uint32_t *sub, int *toggle,
 	int ret;
 	uint32_t hcint, hctsiz;
 
-	ret = wait_for_bit(&hc_regs->hcint, DWC2_HCINT_CHHLTD, true);
+	ret = wait_for_bit(__func__, &hc_regs->hcint, DWC2_HCINT_CHHLTD, true,
+			   1000, false);
 	if (ret)
 		return ret;
 
-- 
2.5.0

[U-Boot] [PATCH v2 3/5] usb: ohci-lpc32xx: Use shared wait_for_bit

[Mateusz Kulikowski]

Use existing library function to poll bit(s).

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
Tested-by: Sylvain Lemieux <slemieux@tycoint.com>
---

 drivers/usb/host/ohci-lpc32xx.c | 34 +++++++---------------------------
 1 file changed, 7 insertions(+), 27 deletions(-)

diff --git a/drivers/usb/host/ohci-lpc32xx.c b/drivers/usb/host/ohci-lpc32xx.c
index 48d338e..9245126 100644
--- a/drivers/usb/host/ohci-lpc32xx.c
+++ b/drivers/usb/host/ohci-lpc32xx.c
@@ -10,6 +10,7 @@
 
 #include <common.h>
 #include <errno.h>
+#include <wait_bit.h>
 #include <asm/io.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/clk.h>
@@ -80,30 +81,6 @@ struct otg_regs {
 static struct otg_regs *otg = (struct otg_regs *)USB_BASE;
 static struct clk_pm_regs *clk_pwr = (struct clk_pm_regs *)CLK_PM_BASE;
 
-static int wait_for_bit(void *reg, const u32 mask, bool set)
-{
-	u32 val;
-	unsigned long start = get_timer(0);
-
-	while (1) {
-		val = readl(reg);
-		if (!set)
-			val = ~val;
-
-		if ((val & mask) == mask)
-			return 0;
-
-		if (get_timer(start) > CONFIG_SYS_HZ)
-			break;
-
-		udelay(1);
-	}
-
-	error("Timeout (reg=%p mask=%08x wait_set=%i)\n", reg, mask, set);
-
-	return -ETIMEDOUT;
-}
-
 static int isp1301_set_value(int reg, u8 value)
 {
 	return i2c_write(ISP1301_I2C_ADDR, reg, 1, &value, 1);
@@ -158,7 +135,8 @@ static int usbpll_setup(void)
 	setbits_le32(&clk_pwr->usb_ctrl, CLK_USBCTRL_POSTDIV_2POW(0x01));
 	setbits_le32(&clk_pwr->usb_ctrl, CLK_USBCTRL_PLL_PWRUP);
 
-	ret = wait_for_bit(&clk_pwr->usb_ctrl, CLK_USBCTRL_PLL_STS, 1);
+	ret = wait_for_bit(__func__, &clk_pwr->usb_ctrl, CLK_USBCTRL_PLL_STS,
+			   true, CONFIG_SYS_HZ, false);
 	if (ret)
 		return ret;
 
@@ -183,7 +161,8 @@ int usb_cpu_init(void)
 
 	/* enable I2C clock */
 	writel(OTG_CLK_I2C_EN, &otg->otg_clk_ctrl);
-	ret = wait_for_bit(&otg->otg_clk_sts, OTG_CLK_I2C_EN, 1);
+	ret = wait_for_bit(__func__, &otg->otg_clk_sts, OTG_CLK_I2C_EN, true,
+			   CONFIG_SYS_HZ, false);
 	if (ret)
 		return ret;
 
@@ -203,7 +182,8 @@ int usb_cpu_init(void)
 			 OTG_CLK_I2C_EN | OTG_CLK_HOST_EN;
 	writel(mask, &otg->otg_clk_ctrl);
 
-	ret = wait_for_bit(&otg->otg_clk_sts, mask, 1);
+	ret = wait_for_bit(__func__, &otg->otg_clk_sts, mask, true,
+			   CONFIG_SYS_HZ, false);
 	if (ret)
 		return ret;
 
-- 
2.5.0

[U-Boot] [PATCH v2 4/5] usb: ehci-mx6: Use shared wait_for_bit

[Mateusz Kulikowski]

Use existing library function to poll bit(s).

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
---

 drivers/usb/host/ehci-mx6.c | 32 ++++----------------------------
 1 file changed, 4 insertions(+), 28 deletions(-)

diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c
index 2666351..e1c67f7 100644
--- a/drivers/usb/host/ehci-mx6.c
+++ b/drivers/usb/host/ehci-mx6.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <usb.h>
 #include <errno.h>
+#include <wait_bit.h>
 #include <linux/compiler.h>
 #include <usb/ehci-fsl.h>
 #include <asm/io.h>
@@ -117,32 +118,6 @@ static void usb_power_config(int index)
 		     pll_480_ctrl_set);
 }
 
-static int wait_for_bit(u32 *reg, const u32 mask, bool set)
-{
-	u32 val;
-	const unsigned int timeout = 10000;
-	unsigned long start = get_timer(0);
-
-	while(1) {
-		val = readl(reg);
-		if (!set)
-			val = ~val;
-
-		if ((val & mask) == mask)
-			return 0;
-
-		if (get_timer(start) > timeout)
-			break;
-
-		udelay(1);
-	}
-
-	debug("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n",
-			__func__, reg, mask, set);
-
-	return -ETIMEDOUT;
-}
-
 /* Return 0 : host node, <>0 : device mode */
 static int usb_phy_enable(int index, struct usb_ehci *ehci)
 {
@@ -160,12 +135,13 @@ static int usb_phy_enable(int index, struct usb_ehci *ehci)
 
 	/* Stop then Reset */
 	clrbits_le32(usb_cmd, UCMD_RUN_STOP);
-	ret = wait_for_bit(usb_cmd, UCMD_RUN_STOP, 0);
+	ret = wait_for_bit(__func__, usb_cmd, UCMD_RUN_STOP, false, 10000,
+			   false);
 	if (ret)
 		return ret;
 
 	setbits_le32(usb_cmd, UCMD_RESET);
-	ret = wait_for_bit(usb_cmd, UCMD_RESET, 0);
+	ret = wait_for_bit(__func__, usb_cmd, UCMD_RESET, false, 10000, false);
 	if (ret)
 		return ret;
 
-- 
2.5.0

[U-Boot] [PATCH v2 5/5] net: zynq_gem: Use shared wait_for_bit

[Mateusz Kulikowski]

Use existing library function to poll bit(s).

Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
---

 drivers/net/zynq_gem.c | 35 ++---------------------------------
 1 file changed, 2 insertions(+), 33 deletions(-)

diff --git a/drivers/net/zynq_gem.c b/drivers/net/zynq_gem.c
index 0a41281..430c2a4 100644
--- a/drivers/net/zynq_gem.c
+++ b/drivers/net/zynq_gem.c
@@ -19,6 +19,7 @@
 #include <asm/io.h>
 #include <phy.h>
 #include <miiphy.h>
+#include <wait_bit.h>
 #include <watchdog.h>
 #include <asm/system.h>
 #include <asm/arch/hardware.h>
@@ -452,38 +453,6 @@ static int zynq_gem_init(struct udevice *dev)
 	return 0;
 }
 
-static int wait_for_bit(const char *func, u32 *reg, const u32 mask,
-			bool set, unsigned int timeout)
-{
-	u32 val;
-	unsigned long start = get_timer(0);
-
-	while (1) {
-		val = readl(reg);
-
-		if (!set)
-			val = ~val;
-
-		if ((val & mask) == mask)
-			return 0;
-
-		if (get_timer(start) > timeout)
-			break;
-
-		if (ctrlc()) {
-			puts("Abort\n");
-			return -EINTR;
-		}
-
-		udelay(1);
-	}
-
-	debug("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n",
-	      func, reg, mask, set);
-
-	return -ETIMEDOUT;
-}
-
 static int zynq_gem_send(struct udevice *dev, void *ptr, int len)
 {
 	u32 addr, size;
@@ -525,7 +494,7 @@ static int zynq_gem_send(struct udevice *dev, void *ptr, int len)
 		printf("TX buffers exhausted in mid frame\n");
 
 	return wait_for_bit(__func__, &regs->txsr, ZYNQ_GEM_TSR_DONE,
-			    true, 20000);
+			    true, 20000, true);
 }
 
 /* Do not check frame_recd flag in rx_status register 0x20 - just poll BD */
-- 
2.5.0

[U-Boot] [PATCH v2 1/5] lib: Add wait_for_bit

[Marek Vasut]

On Wednesday, December 16, 2015 at 10:58:38 PM, Mateusz Kulikowski wrote:
> Add function to poll register waiting for specific bit(s).
> Similar functions are implemented in few drivers - they are almost
> identical and can be generalized.
> 
> Signed-off-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
> ---
> 
>  include/wait_bit.h | 35 +++++++++++++++++++++++++++++++++++
>  lib/Makefile       |  1 +
>  lib/wait_bit.c     | 45 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 81 insertions(+)
>  create mode 100644 include/wait_bit.h
>  create mode 100644 lib/wait_bit.c
> 
> diff --git a/include/wait_bit.h b/include/wait_bit.h
> new file mode 100644
> index 0000000..052a09b
> --- /dev/null
> +++ b/include/wait_bit.h
> @@ -0,0 +1,35 @@
> +/*
> + * Wait for bit with timeout and ctrlc
> + *
> + * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + */
> +
> +#ifndef __WAIT_BIT_H
> +#define __WAIT_BIT_H
> +
> +/**
> + * wait_for_bit()	waits for bit set/cleared in register
> + *
> + * Function polls register waiting for specific bit(s) change
> + * (either 0->1 or 1->0). It can fail under two conditions:
> + * - Timeout
> + * - User interaction (CTRL-C)
> + * Function succeeds only if all bits of masked register are set/cleared
> + * (depending on set option).
> + *
> + * @param prefix	Prefix added to timeout messagge (message visible only
> + *			with debug enabled)
> + * @param reg		Register that will be read (using readl())
> + * @param mask		Bit(s) of register that must be active
> + * @param set		Selects wait condition (bit set or clear)
> + * @param timeout	Timeout (in miliseconds)
> + * @param breakable	Enables CTRL-C interruption
> + * @return		0 on success, -ETIMEDOUT or -EINTR on failure
> + */
> +int wait_for_bit(const char *prefix, const u32 *reg, const u32 mask,
> +		 const bool set, const unsigned int timeout,
> +		 const bool breakable);
> +
> +#endif
> diff --git a/lib/Makefile b/lib/Makefile
> index 1f1ff6f..6fe3ab5 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -81,6 +81,7 @@ obj-y += time.o
>  obj-$(CONFIG_TRACE) += trace.o
>  obj-$(CONFIG_LIB_UUID) += uuid.o
>  obj-$(CONFIG_LIB_RAND) += rand.o
> +obj-y += wait_bit.o
> 
>  ifdef CONFIG_SPL_BUILD
>  # SPL U-Boot may use full-printf, tiny-printf or none at all
> diff --git a/lib/wait_bit.c b/lib/wait_bit.c
> new file mode 100644
> index 0000000..ac35f68
> --- /dev/null
> +++ b/lib/wait_bit.c
> @@ -0,0 +1,45 @@
> +/*
> + * Wait for bit interruptible by timeout or ctrlc
> + *
> + * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
> + *
> + * SPDX-License-Identifier:	GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <console.h>
> +#include <asm/io.h>
> +#include <asm/errno.h>
> +
> +int wait_for_bit(const char *prefix, const u32 *reg, const u32 mask,
> +		 const bool set, const unsigned int timeout,
> +		 const bool breakable)
> +{

I wonder, what would happen if you stuffed this function into the header
file altogether ? I think this would allow the compiler to do interprocedure
optimalization on whichever file this would be included into. I wonder if
that would have any impact on the resulting code size.

[U-Boot] [PATCH v2 1/5] lib: Add wait_for_bit

[Mateusz Kulikowski]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Hi Marek,

On 16.12.2015 23:11, Marek Vasut wrote:
> On Wednesday, December 16, 2015 at 10:58:38 PM, Mateusz Kulikowski wrote:
[...]
>> +#include <console.h>
>> +#include <asm/io.h>
>> +#include <asm/errno.h>
>> +
>> +int wait_for_bit(const char *prefix, const u32 *reg, const u32 mask,
>> +		 const bool set, const unsigned int timeout,
>> +		 const bool breakable)
>> +{
> 
> I wonder, what would happen if you stuffed this function into the header
> file altogether ? I think this would allow the compiler to do interprocedure
> optimalization on whichever file this would be included into. I wonder if
> that would have any impact on the resulting code size.
> 

Of course I can make it static inline.

I was suggested not to care about possible leftovers that are 
not garbage-collected by linker so didn't changed that on V2.

It's (max) few bytes that may be consumed by section alignment.


Regards,
Mateusz
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[U-Boot] [PATCH v2 1/5] lib: Add wait_for_bit

[Marek Vasut]

On Thursday, December 17, 2015 at 12:32:26 AM, Mateusz Kulikowski wrote:
> Hi Marek,

Hi,

> On 16.12.2015 23:11, Marek Vasut wrote:
> > On Wednesday, December 16, 2015 at 10:58:38 PM, Mateusz Kulikowski wrote:
> [...]
> 
> >> +#include <console.h>
> >> +#include <asm/io.h>
> >> +#include <asm/errno.h>
> >> +
> >> +int wait_for_bit(const char *prefix, const u32 *reg, const u32 mask,
> >> +		 const bool set, const unsigned int timeout,
> >> +		 const bool breakable)
> >> +{
> > 
> > I wonder, what would happen if you stuffed this function into the header
> > file altogether ? I think this would allow the compiler to do
> > interprocedure optimalization on whichever file this would be included
> > into. I wonder if that would have any impact on the resulting code size.
> 
> Of course I can make it static inline.
> 
> I was suggested not to care about possible leftovers that are
> not garbage-collected by linker so didn't changed that on V2.
> 
> It's (max) few bytes that may be consumed by section alignment.

I was just curious about how much difference this would make.

Best regards,
Marek Vasut

[U-Boot] [PATCH v2 0/5] Add wait_for_bit()

[LEMIEUX, SYLVAIN]

> From: Mateusz Kulikowski [mailto:mateusz.kulikowski at gmail.com]
> Sent: 16-Dec-15 4:59 PM
> To: u-boot at lists.denx.de; Marek Vasut; LEMIEUX, SYLVAIN; Joe Hershberger
> Cc: Mateusz Kulikowski
> Subject: [PATCH v2 0/5] Add wait_for_bit()
>
> Changes in V2:
> - wait_bit.o is always compiled in
> - Removed CONFIG_LIB_WAIT_BIT from configs/Kconfigs
> - Constified arguments to wait_bit
> - Removed check for CONFIG_... in drivers
> - Added tested-by to ohci-lp32xx
> @Sylvain Lemieux: I didn't changed driver logic with v2,
> so allowed myself to add your tested-by directly.

No problem, thanks

>
> Tested on:
>  - USB driver on Dragonboard (not yet in mainline)
>  - Infinite sleep (if timeout/interruption works)
> Build tested on single board for each driver/commit:
> - hikey
> - zynq_microzed
> - platinum
>

...

>
> --
> 2.5.0


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[U-Boot] [PATCH v2 1/5] lib: Add wait_for_bit

[Mateusz Kulikowski]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Hi Marek,

On 17.12.2015 00:52, Marek Vasut wrote:
[...]

>> Of course I can make it static inline.
>>
>> I was suggested not to care about possible leftovers that are
>> not garbage-collected by linker so didn't changed that on V2.
>>
>> It's (max) few bytes that may be consumed by section alignment.
> 
> I was just curious about how much difference this would make.

I added one more commit (to do wait_for_bit static inline), and ran 
buildman on 4 boards (2x using and 2x not using wait_bit).

tl;dr: 
For (at least) some boards it increases .rodata by 7 bytes.
Even if they don't use wait_for_bit.
Inline version works better, as it doesn't touch them

My proposal - I'll send v3 with wait_for_bit as static inline...

Buildman output:

$ tools/buildman/buildman -b wait_for_bit_v2 -o buildman  hikey sandbox usb_a9263 zynq_picozed -sdSB
boards.cfg is up to date. Nothing to do.
Summary of 7 commits for 4 boards (4 threads, 1 job per thread)
01: eeprom: fix eeprom write procedure
02: lib: Add wait_for_bit
   sandbox: (for 1/1 boards)  all +224.0  text +224.0 
            sandbox        :  all +224  text +224 
               u-boot: add: 1/0, grow: 0/0 bytes: 137/0 (137)
                 function                                   old     new   delta
                 wait_for_bit                                 -     137    +137
       arm: (for 2/2 boards)  spl/u-boot-spl:all +3.5  spl/u-boot-spl:rodata +3.5 
            zynq_picozed   :  spl/u-boot-spl:all +7  spl/u-boot-spl:rodata +7 
03: usb: dwc2: Use shared wait_for_bit
   aarch64: (for 1/1 boards)  all +168.0  rodata +16.0  text +152.0 
            hikey          :  all +168  rodata +16  text +152 
               u-boot: add: 0/0, grow: 4/0 bytes: 156/0 (156)
                 function                                   old     new   delta
                 wait_for_bit                               104     164     +60
                 usb_lowlevel_init                          820     864     +44
                 dwc_otg_core_reset                         120     156     +36
                 wait_for_chhltd                            140     156     +16
04: usb: ohci-lpc32xx: Use shared wait_for_bit
05: usb: ehci-mx6: Use shared wait_for_bit
06: net: zynq_gem: Use shared wait_for_bit
       arm: (for 2/2 boards)  all +53.0  bss +6.0  rodata +7.0  text +40.0 
            zynq_picozed   :  all +106  bss +12  rodata +14  text +80 
               u-boot: add: 1/0, grow: 0/-1 bytes: 140/-68 (72)
                 function                                   old     new   delta
                 wait_for_bit                                 -     140    +140
                 zynq_gem_send                              276     208     -68
07: make wait_bit static inline
   sandbox: (for 1/1 boards)  all -224.0  text -224.0 
            sandbox        :  all -224  text -224 
       arm: (for 2/2 boards)  spl/u-boot-spl:all -3.5  spl/u-boot-spl:rodata -3.5 
            zynq_picozed   :  spl/u-boot-spl:all -7  spl/u-boot-spl:rodata -7 


Regards,
Mateusz
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