Re: [PATCH 1/3] [media] winbond-cir: only enable higher sample resolution if needed

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On Sun, Jan 06, 2013 at 05:19:43PM +0000, Sean Young wrote:
>A sample resolution of 2us generates more than 300 interrupts per key
>and this resolution is not needed unless carrier reports are enabled.
>
>Revert to a resolution of 10us unless carrier reports are needed. This
>generates up to a fifth of the interrupts.
>
>Signed-off-by: Sean Young <sean@xxxxxxxx>

Thanks Sean!

Acked-by: David Härdeman <david@xxxxxxxxxxx>

>---
> drivers/media/rc/winbond-cir.c | 27 +++++++++++++++++++--------
> 1 file changed, 19 insertions(+), 8 deletions(-)
>
>diff --git a/drivers/media/rc/winbond-cir.c b/drivers/media/rc/winbond-cir.c
>index 553d1cd..66f543c 100644
>--- a/drivers/media/rc/winbond-cir.c
>+++ b/drivers/media/rc/winbond-cir.c
>@@ -154,6 +154,8 @@
> #define WBCIR_CNTR_R		0x02
> /* Invert TX */
> #define WBCIR_IRTX_INV		0x04
>+/* Receiver oversampling */
>+#define WBCIR_RX_T_OV		0x40
> 
> /* Valid banks for the SP3 UART */
> enum wbcir_bank {
>@@ -394,7 +396,8 @@ wbcir_irq_rx(struct wbcir_data *data, struct pnp_dev *device)
> 		if (data->rxstate == WBCIR_RXSTATE_ERROR)
> 			continue;
> 
>-		duration = ((irdata & 0x7F) + 1) * 2;
>+		duration = ((irdata & 0x7F) + 1) *
>+			(data->carrier_report_enabled ? 2 : 10);
> 		rawir.pulse = irdata & 0x80 ? false : true;
> 		rawir.duration = US_TO_NS(duration);
> 
>@@ -550,6 +553,17 @@ wbcir_set_carrier_report(struct rc_dev *dev, int enable)
> 		wbcir_set_bits(data->ebase + WBCIR_REG_ECEIR_CCTL,
> 				WBCIR_CNTR_EN, WBCIR_CNTR_EN | WBCIR_CNTR_R);
> 
>+	/* Set a higher sampling resolution if carrier reports are enabled */
>+	wbcir_select_bank(data, WBCIR_BANK_2);
>+	data->dev->rx_resolution = US_TO_NS(enable ? 2 : 10);
>+	outb(enable ? 0x03 : 0x0f, data->sbase + WBCIR_REG_SP3_BGDL);
>+	outb(0x00, data->sbase + WBCIR_REG_SP3_BGDH);
>+
>+	/* Enable oversampling if carrier reports are enabled */
>+	wbcir_select_bank(data, WBCIR_BANK_7);
>+	wbcir_set_bits(data->sbase + WBCIR_REG_SP3_RCCFG,
>+				enable ? WBCIR_RX_T_OV : 0, WBCIR_RX_T_OV);
>+
> 	data->carrier_report_enabled = enable;
> 	spin_unlock_irqrestore(&data->spinlock, flags);
> 
>@@ -931,8 +945,8 @@ wbcir_init_hw(struct wbcir_data *data)
> 	/* prescaler 1.0, tx/rx fifo lvl 16 */
> 	outb(0x30, data->sbase + WBCIR_REG_SP3_EXCR2);
> 
>-	/* Set baud divisor to sample every 2 ns */
>-	outb(0x03, data->sbase + WBCIR_REG_SP3_BGDL);
>+	/* Set baud divisor to sample every 10 us */
>+	outb(0x0f, data->sbase + WBCIR_REG_SP3_BGDL);
> 	outb(0x00, data->sbase + WBCIR_REG_SP3_BGDH);
> 
> 	/* Set CEIR mode */
>@@ -941,12 +955,9 @@ wbcir_init_hw(struct wbcir_data *data)
> 	inb(data->sbase + WBCIR_REG_SP3_LSR); /* Clear LSR */
> 	inb(data->sbase + WBCIR_REG_SP3_MSR); /* Clear MSR */
> 
>-	/*
>-	 * Disable RX demod, enable run-length enc/dec, set freq span and
>-	 * enable over-sampling
>-	 */
>+	/* Disable RX demod, enable run-length enc/dec, set freq span */
> 	wbcir_select_bank(data, WBCIR_BANK_7);
>-	outb(0xd0, data->sbase + WBCIR_REG_SP3_RCCFG);
>+	outb(0x90, data->sbase + WBCIR_REG_SP3_RCCFG);
> 
> 	/* Disable timer */
> 	wbcir_select_bank(data, WBCIR_BANK_4);
>-- 
>1.7.11.7
>

-- 
David Härdeman
--
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