On Sat, Jun 25, 2011 at 5:53 AM, Kevin Hilman [off-list ref] wrote:

"Govindraj.R" [off-list ref] writes:

quoted

Use resume idle call from prcm_irq to enable uart_port from low power states.

Comment is valid for OMAP3 but not for OMAP2.  Maybe [01/12] should just
leave this call in for OMAP2 instead of having to add it back here?

quoted

Add api to check pad wakeup status which will we used from uart_resume func.
to enable back uart port if a wakeup event occurred.

s/api/API/  (same for PRCM, UART, int subject)

quoted

UART_Resume func. can be removed once we have irq_chaining functionality
available.

Have you tested removing this when using with Tero's series?

I added Tero's v3 patch 1,2,3,4 on top of my runtime changes

console gets looped with below prints during bootup [1]
not sure whats happening need to look into it.

[1]:
http://pastebin.com/C55gtGhp

<<SNIP>>

[    2.740692] Registering the dns_resolver key type
[    2.746490] VFP support v0.3: implementor 41 architecture 3 part 30
variant c rev 1
[    2.754669] ThumbEE CPU extension supported.
[    2.772583] irq 368, desc: c0635540, depth: 1, count: 0, unhandled: 0
[    2.779388] ->handle_irq():  c00e494c, handle_bad_irq+0x0/0x260
[    2.785675] ->irq_data.chip(): c067f254, no_irq_chip+0x0/0x5c
[    2.791748] ->action():   (null)
[    2.795166]    IRQ_NOPROBE set
[    2.798370]  IRQ_NOREQUEST set
[    2.801605] irq 368, desc: c0635540, depth: 1, count: 0, unhandled: 0
[    2.808380] ->handle_irq():  c00e494c, handle_bad_irq+0x0/0x260
[    2.814636] ->irq_data.chip(): c067f254, no_irq_chip+0x0/0x5c
[    2.820709] ->action():   (null)
[    2.824127]    IRQ_NOPROBE set
[    2.827331]  IRQ_NOREQUEST set
[    2.830566] irq 368, desc: c0635540, depth: 1, count: 0, unhandled: 0
[    2.837371] ->handle_irq():  c00e494c, handle_bad_irq+0x0/0x260
[    2.843627] ->irq_data.chip(): c067f254, no_irq_chip+0x0/0x5c
[    2.849700] ->action():   (null)

<<SNIP>>

--
Thanks,
Govindraj.R

quoted

Signed-off-by: Govindraj.R <redacted>
---
 arch/arm/mach-omap2/pm24xx.c                  |    2 ++
 arch/arm/mach-omap2/pm34xx.c                  |    2 ++
 arch/arm/mach-omap2/serial.c                  |   23 +++++++++++++++++++++++
 arch/arm/plat-omap/include/plat/omap-serial.h |    2 ++
 arch/arm/plat-omap/include/plat/serial.h      |    1 +
 drivers/tty/serial/omap-serial.c              |   23 +++++++++++++++++++++++
 6 files changed, 53 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
index c405bda..ba58a1d 100644
--- a/arch/arm/mach-omap2/pm24xx.c
+++ b/arch/arm/mach-omap2/pm24xx.c

@@ -137,6 +137,8 @@ static void omap2_enter_full_retention(void)

                         OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL),
                         OMAP_SDRC_REGADDR(SDRC_POWER));

+     omap_uart_resume_idle();
+
 no_sleep:
      if (omap2_pm_debug) {
              unsigned long long tmp;

diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index ac7b7f8..3997e92 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c

@@ -216,6 +216,8 @@ static int prcm_clear_mod_irqs(s16 module, u8 regs)

      wkst = omap2_prm_read_mod_reg(module, wkst_off);
      wkst &= omap2_prm_read_mod_reg(module, grpsel_off);
+
+     c += omap_uart_resume_idle();
      if (wkst) {
              iclk = omap2_cm_read_mod_reg(module, iclk_off);
              fclk = omap2_cm_read_mod_reg(module, fclk_off);

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 6ac078f..4bc5914 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c

@@ -199,6 +199,28 @@ static void omap_serial_fill_default_pads(struct omap_board_data *bdata)

      }
 }

+/* TBD: Will be removed once we have irq-chaing mechanism */

s/TBD/FIXME/

quoted

+static bool omap_uart_chk_wakeup(struct platform_device *pdev)
+{
+     struct omap_uart_port_info *up = pdev->dev.platform_data;
+     struct omap_device *od;
+     u32 wkst = 0;
+     bool ret = false;
+
+     od = to_omap_device(pdev);
+     if (omap_hmwod_pad_get_wakeup_status(od->hwmods[0]))
+             ret = true;
+
+     /* Check for normal UART wakeup (and clear it) */
+     wkst = __raw_readl(up->wk_st) & up->wk_mask;
+     if (wkst) {
+             __raw_writel(wkst, up->wk_st);
+             ret = true;
+     }
+
+     return ret;
+}
+
 static void omap_uart_wakeup_enable(struct platform_device *pdev, bool enable)
 {
      struct omap_uart_port_info *up = pdev->dev.platform_data;

@@ -369,6 +391,7 @@ void __init omap_serial_init_port(struct omap_board_data *bdata,

      pdata->uartclk = OMAP24XX_BASE_BAUD * 16;
      pdata->flags = UPF_BOOT_AUTOCONF;
      pdata->enable_wakeup = omap_uart_wakeup_enable;
+     pdata->chk_wakeup = omap_uart_chk_wakeup;
      pdata->dma_enabled = info->dma_enabled;
      pdata->dma_rx_buf_size = info->dma_rx_buf_size;
      pdata->dma_rx_poll_rate = info->dma_rx_poll_rate;

diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h b/arch/arm/plat-omap/include/plat/omap-serial.h
index c5f4dd9..b5117bd 100644
--- a/arch/arm/plat-omap/include/plat/omap-serial.h
+++ b/arch/arm/plat-omap/include/plat/omap-serial.h

@@ -75,6 +75,7 @@ struct omap_uart_port_info {

      unsigned int            auto_sus_timeout; /* Auto_suspend timeout */

      void (*enable_wakeup)(struct platform_device *, bool);
+     bool (*chk_wakeup)(struct platform_device *);
      void __iomem *wk_st;
      void __iomem *wk_en;
      u32 wk_mask;

@@ -132,6 +133,7 @@ struct uart_omap_port {

      unsigned long           port_activity;
      unsigned int            errata;
      void (*enable_wakeup)(struct platform_device *, bool);
+     bool (*chk_wakeup)(struct platform_device *);
 };

 #endif /* __OMAP_SERIAL_H__ */

diff --git a/arch/arm/plat-omap/include/plat/serial.h b/arch/arm/plat-omap/include/plat/serial.h
index ee758d4..44a42aa 100644
--- a/arch/arm/plat-omap/include/plat/serial.h
+++ b/arch/arm/plat-omap/include/plat/serial.h

@@ -109,6 +109,7 @@ extern void omap_serial_init(void);

 extern void omap_serial_board_init(struct omap_uart_port_info *platform_data);
 extern void omap_serial_init_port(struct omap_board_data *bdata,
              struct omap_uart_port_info *platform_data);
+extern u32 omap_uart_resume_idle(void);
 #endif

 #endif

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 307b7c6..c3561dd 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c

@@ -43,6 +43,7 @@

 #include <plat/dmtimer.h>
 #include <plat/omap-serial.h>
 #include <plat/omap_device.h>
+#include <plat/serial.h>

 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];

@@ -108,6 +109,27 @@ static inline void serial_omap_port_enable(struct uart_omap_port *up)

      pm_runtime_get_sync(&up->pdev->dev);
 }

+/* TBD: Should be removed once we irq-chaining mechanism in place */
+u32 omap_uart_resume_idle()
+{
+     int i;
+     u32 ret = 0;
+
+     for (i = 0; i < OMAP_MAX_HSUART_PORTS; i++) {
+             struct uart_omap_port *up = ui[i];
+
+             if (!up)
+                     continue;
+
+             if (up->chk_wakeup(up->pdev)) {
+                     serial_omap_port_enable(up);
+                     serial_omap_port_disable(up);
+                     ret++;
+             }
+     }
+     return ret;
+}
+
 static void serial_omap_stop_rxdma(struct uart_omap_port *up)
 {
      if (up->uart_dma.rx_dma_used) {

@@ -1392,6 +1414,7 @@ static int serial_omap_probe(struct platform_device *pdev)

      up->uart_dma.uart_base = mem->start;
      up->errata = omap_up_info->errata;
      up->enable_wakeup = omap_up_info->enable_wakeup;
+     up->chk_wakeup = omap_up_info->chk_wakeup;

      if (omap_up_info->dma_enabled) {
              up->uart_dma.uart_dma_tx = dma_tx->start;

Kevin
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