[media] winbond-cir: only enable higher sample resolution if needed

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@mess.org>
Acked-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 19 insertions, 8 deletions

diff --git a/drivers/media/rc/winbond-cir.c b/drivers/media/rc/winbond-cir.c
index 85424856ae7f..535a18dccbd0 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);