| Message ID | 20160609151039.20817-3-bhuvanchandra.dv@toradex.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
On Thu, Jun 09, 2016 at 08:40:33PM +0530, Bhuvanchandra DV wrote: > From: Stefan Agner <stefan@agner.ch> > > In order to allow wake support in STOP sleep mode, clocks are > needed. Use imx_clk_gate2_cgr to disable automatic clock gating > in low power mode STOP. This allows to enable wake by UART using: > echo enabled > /sys/class/tty/ttyLP0/power/wakeup > > However, if wake is not enabled, the driver should disable the > clocks explicitly to save power. > > Signed-off-by: Stefan Agner <stefan@agner.ch> > --- > drivers/clk/imx/clk-vf610.c | 12 ++++++------ Please send clock driver changes in a separate patch. Shawn > drivers/tty/serial/fsl_lpuart.c | 16 ++++++++++++++-- > 2 files changed, 20 insertions(+), 8 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-clk" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Shawn, On 06/11/2016 02:03 PM, Shawn Guo wrote: > On Thu, Jun 09, 2016 at 08:40:33PM +0530, Bhuvanchandra DV wrote: >> From: Stefan Agner <stefan@agner.ch> >> >> In order to allow wake support in STOP sleep mode, clocks are >> needed. Use imx_clk_gate2_cgr to disable automatic clock gating >> in low power mode STOP. This allows to enable wake by UART using: >> echo enabled > /sys/class/tty/ttyLP0/power/wakeup >> >> However, if wake is not enabled, the driver should disable the >> clocks explicitly to save power. >> >> Signed-off-by: Stefan Agner <stefan@agner.ch> >> --- >> drivers/clk/imx/clk-vf610.c | 12 ++++++------ > Please send clock driver changes in a separate patch. How about splitting this patchset to two? few patches are having minor fixes and the few patches might need some review and discussions. May be some thing like DMA fixes and the other minor fixes. -- Bhuvan > > Shawn > >> drivers/tty/serial/fsl_lpuart.c | 16 ++++++++++++++-- >> 2 files changed, 20 insertions(+), 8 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-clk" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On June 13, 2016 5:18:19 PM PDT, Bhhuvanchandra DV <bhuvanchandra.dv@toradex.com> wrote: >Hi Shawn, > >On 06/11/2016 02:03 PM, Shawn Guo wrote: > >> On Thu, Jun 09, 2016 at 08:40:33PM +0530, Bhuvanchandra DV wrote: >>> From: Stefan Agner <stefan@agner.ch> >>> >>> In order to allow wake support in STOP sleep mode, clocks are >>> needed. Use imx_clk_gate2_cgr to disable automatic clock gating >>> in low power mode STOP. This allows to enable wake by UART using: >>> echo enabled > /sys/class/tty/ttyLP0/power/wakeup >>> >>> However, if wake is not enabled, the driver should disable the >>> clocks explicitly to save power. >>> >>> Signed-off-by: Stefan Agner <stefan@agner.ch> >>> --- >>> drivers/clk/imx/clk-vf610.c | 12 ++++++------ >> Please send clock driver changes in a separate patch. The changes are dependet on each other, hence I put it in a single patch. But since it is a new feature it shouldn't really matter... > >How about splitting this patchset to two? few patches are having minor >fixes and the few patches might need some review and discussions. >May be some thing like DMA fixes and the other minor fixes. I don't think that splitting up the patchset is necessary, with the current order it is possible to pick up the fixes independently... -- Stefan > >-- >Bhuvan > >> >> Shawn >> >>> drivers/tty/serial/fsl_lpuart.c | 16 ++++++++++++++-- >>> 2 files changed, 20 insertions(+), 8 deletions(-)
On 06/13, Stefan Agner wrote: > > > On June 13, 2016 5:18:19 PM PDT, Bhhuvanchandra DV <bhuvanchandra.dv@toradex.com> wrote: > >Hi Shawn, > > > >On 06/11/2016 02:03 PM, Shawn Guo wrote: > > > >> On Thu, Jun 09, 2016 at 08:40:33PM +0530, Bhuvanchandra DV wrote: > >>> From: Stefan Agner <stefan@agner.ch> > >>> > >>> In order to allow wake support in STOP sleep mode, clocks are > >>> needed. Use imx_clk_gate2_cgr to disable automatic clock gating > >>> in low power mode STOP. This allows to enable wake by UART using: > >>> echo enabled > /sys/class/tty/ttyLP0/power/wakeup > >>> > >>> However, if wake is not enabled, the driver should disable the > >>> clocks explicitly to save power. > >>> > >>> Signed-off-by: Stefan Agner <stefan@agner.ch> > >>> --- > >>> drivers/clk/imx/clk-vf610.c | 12 ++++++------ > >> Please send clock driver changes in a separate patch. > > The changes are dependet on each other, hence I put it in a single patch. But since it is a new feature it shouldn't really matter... > > > > >How about splitting this patchset to two? few patches are having minor > >fixes and the few patches might need some review and discussions. > >May be some thing like DMA fixes and the other minor fixes. > > I don't think that splitting up the patchset is necessary, with the current order it is possible to pick up the fixes independently... > I think the main problem is clk and tty subsystems are modified in the same patch here. Did you want an ack from clk maintainers here or will the patch be split so we can take the clk part through clk tree?
diff --git a/drivers/clk/imx/clk-vf610.c b/drivers/clk/imx/clk-vf610.c index 3a1f244..0476353 100644 --- a/drivers/clk/imx/clk-vf610.c +++ b/drivers/clk/imx/clk-vf610.c @@ -315,12 +315,12 @@ static void __init vf610_clocks_init(struct device_node *ccm_node) clk[VF610_CLK_PIT] = imx_clk_gate2("pit", "ipg_bus", CCM_CCGR1, CCM_CCGRx_CGn(7)); - clk[VF610_CLK_UART0] = imx_clk_gate2("uart0", "ipg_bus", CCM_CCGR0, CCM_CCGRx_CGn(7)); - clk[VF610_CLK_UART1] = imx_clk_gate2("uart1", "ipg_bus", CCM_CCGR0, CCM_CCGRx_CGn(8)); - clk[VF610_CLK_UART2] = imx_clk_gate2("uart2", "ipg_bus", CCM_CCGR0, CCM_CCGRx_CGn(9)); - clk[VF610_CLK_UART3] = imx_clk_gate2("uart3", "ipg_bus", CCM_CCGR0, CCM_CCGRx_CGn(10)); - clk[VF610_CLK_UART4] = imx_clk_gate2("uart4", "ipg_bus", CCM_CCGR6, CCM_CCGRx_CGn(9)); - clk[VF610_CLK_UART5] = imx_clk_gate2("uart5", "ipg_bus", CCM_CCGR6, CCM_CCGRx_CGn(10)); + clk[VF610_CLK_UART0] = imx_clk_gate2_cgr("uart0", "ipg_bus", CCM_CCGR0, CCM_CCGRx_CGn(7), 0x2); + clk[VF610_CLK_UART1] = imx_clk_gate2_cgr("uart1", "ipg_bus", CCM_CCGR0, CCM_CCGRx_CGn(8), 0x2); + clk[VF610_CLK_UART2] = imx_clk_gate2_cgr("uart2", "ipg_bus", CCM_CCGR0, CCM_CCGRx_CGn(9), 0x2); + clk[VF610_CLK_UART3] = imx_clk_gate2_cgr("uart3", "ipg_bus", CCM_CCGR0, CCM_CCGRx_CGn(10), 0x2); + clk[VF610_CLK_UART4] = imx_clk_gate2_cgr("uart4", "ipg_bus", CCM_CCGR6, CCM_CCGRx_CGn(9), 0x2); + clk[VF610_CLK_UART5] = imx_clk_gate2_cgr("uart5", "ipg_bus", CCM_CCGR6, CCM_CCGRx_CGn(10), 0x2); clk[VF610_CLK_I2C0] = imx_clk_gate2("i2c0", "ipg_bus", CCM_CCGR4, CCM_CCGRx_CGn(6)); clk[VF610_CLK_I2C1] = imx_clk_gate2("i2c1", "ipg_bus", CCM_CCGR4, CCM_CCGRx_CGn(7)); diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index fabfa7e..75a2098 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -483,9 +483,8 @@ static void lpuart_dma_rx_complete(void *arg) spin_unlock_irqrestore(&sport->port.lock, flags); } -static void lpuart_timer_func(unsigned long data) +static void lpuart_dma_rx_terminate(struct lpuart_port *sport) { - struct lpuart_port *sport = (struct lpuart_port *)data; struct tty_port *port = &sport->port.state->port; struct dma_tx_state state; unsigned long flags; @@ -510,6 +509,11 @@ static void lpuart_timer_func(unsigned long data) spin_unlock_irqrestore(&sport->port.lock, flags); } +static void lpuart_timer_func(unsigned long data) +{ + lpuart_dma_rx_terminate((struct lpuart_port *)data); +} + static inline void lpuart_prepare_rx(struct lpuart_port *sport) { unsigned long flags; @@ -1925,7 +1929,12 @@ static int lpuart_suspend(struct device *dev) writeb(temp, sport->port.membase + UARTCR2); } + if (sport->dma_rx_in_progress) + lpuart_dma_rx_terminate(sport); + uart_suspend_port(&lpuart_reg, &sport->port); + if (sport->port.suspended && !sport->port.irq_wake) + clk_disable_unprepare(sport->clk); return 0; } @@ -1935,6 +1944,9 @@ static int lpuart_resume(struct device *dev) struct lpuart_port *sport = dev_get_drvdata(dev); unsigned long temp; + if (sport->port.suspended && !sport->port.irq_wake) + clk_prepare_enable(sport->clk); + if (sport->lpuart32) { lpuart32_setup_watermark(sport); temp = lpuart32_read(sport->port.membase + UARTCTRL);