[media] cx24120: Return DVBv3 signal strength from cache

This patch changes DVBv3 signal strength to read from the cache by
moving the signal strength reading routine into get_stat, and
reducing read_signal_strength to just returning the cached value.

Signed-off-by: Jemma Denson <jdenson@gmail.com>
Signed-off-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/dvb-frontends/cx24120.c b/drivers/media/dvb-frontends/cx24120.c
index dfa2b6d..eecfe22 100644 (file)
--- a/drivers/media/dvb-frontends/cx24120.c
+++ b/drivers/media/dvb-frontends/cx24120.c
@@ -422,28 +422,14 @@ static int cx24120_read_signal_strength(struct dvb_frontend *fe,
                                        u16 *signal_strength)
 {
        struct cx24120_state *state = fe->demodulator_priv;
-       struct cx24120_cmd cmd;
-       int ret, sigstr_h, sigstr_l;
-
-       cmd.id = CMD_READ_SNR;
-       cmd.len = 1;
-       cmd.arg[0] = 0x00;
-
-       ret = cx24120_message_send(state, &cmd);
-       if (ret != 0) {
-               err("error reading signal strength\n");
-               return -EREMOTEIO;
-       }
+       struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 
-       /* raw */
-       sigstr_h = (cx24120_readreg(state, CX24120_REG_SIGSTR_H) >> 6) << 8;
-       sigstr_l = cx24120_readreg(state, CX24120_REG_SIGSTR_L);
-       dev_dbg(&state->i2c->dev, "%s: Signal strength from firmware= 0x%x\n",
-               __func__, (sigstr_h | sigstr_l));
+       if (c->strength.stat[0].scale != FE_SCALE_RELATIVE)
+               *signal_strength = 0;
+       else
+               *signal_strength = c->strength.stat[0].uvalue;
 
-       /* cooked */
-       *signal_strength = ((sigstr_h | sigstr_l)  << 5) & 0x0000ffff;
-       dev_dbg(&state->i2c->dev, "%s: Signal strength= 0x%x\n",
+       dev_dbg(&state->i2c->dev, "%s: Signal strength from cache: 0x%x\n",
                __func__, *signal_strength);
 
        return 0;
@@ -621,16 +607,34 @@ static void cx24120_get_stats(struct cx24120_state *state)
 {
        struct dvb_frontend *fe = &state->frontend;
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
-       int ret;
+       struct cx24120_cmd cmd;
+       int ret, sigstr_h, sigstr_l;
        u16 u16tmp;
 
        dev_dbg(&state->i2c->dev, "%s()\n", __func__);
 
        /* signal strength */
        if (state->fe_status & FE_HAS_SIGNAL) {
-               ret = cx24120_read_signal_strength(fe, &u16tmp);
-               if (ret != 0)
+               cmd.id = CMD_READ_SNR;
+               cmd.len = 1;
+               cmd.arg[0] = 0x00;
+
+               ret = cx24120_message_send(state, &cmd);
+               if (ret != 0) {
+                       err("error reading signal strength\n");
                        return;
+               }
+
+               /* raw */
+               sigstr_h = (cx24120_readreg(state, CX24120_REG_SIGSTR_H) >> 6) << 8;
+               sigstr_l = cx24120_readreg(state, CX24120_REG_SIGSTR_L);
+               dev_dbg(&state->i2c->dev, "%s: Signal strength from firmware= 0x%x\n",
+                       __func__, (sigstr_h | sigstr_l));
+
+               /* cooked */
+               u16tmp = ((sigstr_h | sigstr_l)  << 5) & 0x0000ffff;
+               dev_dbg(&state->i2c->dev, "%s: Signal strength= 0x%x\n",
+                       __func__, u16tmp);
 
                c->strength.stat[0].scale = FE_SCALE_RELATIVE;
                c->strength.stat[0].uvalue = u16tmp;