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authorMauro Carvalho Chehab <mchehab@redhat.com>2010-09-26 21:58:28 -0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-10-20 23:17:43 -0400
commite350d44fed8eb86a7192a579e3687fcd76a4645b (patch)
tree9e80c1c819150391729d7247e9f9d450d6edd11b /drivers/media/common
parent78bb6df6f2dd390a3480249187a055c385c0618a (diff)
[media] tda18271: allow restricting max out to 4 bytes
By default, tda18271 tries to optimize I2C bus by updating all registers at the same time. Unfortunately, some devices doesn't support it. The current logic has a problem when small_i2c is equal to 8, since there are some transfers using 11 + 1 bytes. Fix the problem by enforcing the max size at the right place, and allows reducing it to max = 3 + 1. Acked-by: Michael Krufky <mkrufky@kernellabs.com> Acked-by: Sri Deevi <Srinivasa.Deevi@conexant.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/common')
-rw-r--r--drivers/media/common/tuners/tda18271-common.c59
-rw-r--r--drivers/media/common/tuners/tda18271.h5
2 files changed, 37 insertions, 27 deletions
diff --git a/drivers/media/common/tuners/tda18271-common.c b/drivers/media/common/tuners/tda18271-common.c
index e1f678281a58..195b30e3872d 100644
--- a/drivers/media/common/tuners/tda18271-common.c
+++ b/drivers/media/common/tuners/tda18271-common.c
@@ -193,20 +193,46 @@ int tda18271_write_regs(struct dvb_frontend *fe, int idx, int len)
193 unsigned char *regs = priv->tda18271_regs; 193 unsigned char *regs = priv->tda18271_regs;
194 unsigned char buf[TDA18271_NUM_REGS + 1]; 194 unsigned char buf[TDA18271_NUM_REGS + 1];
195 struct i2c_msg msg = { .addr = priv->i2c_props.addr, .flags = 0, 195 struct i2c_msg msg = { .addr = priv->i2c_props.addr, .flags = 0,
196 .buf = buf, .len = len + 1 }; 196 .buf = buf };
197 int i, ret; 197 int i, ret = 1, max;
198 198
199 BUG_ON((len == 0) || (idx + len > sizeof(buf))); 199 BUG_ON((len == 0) || (idx + len > sizeof(buf)));
200 200
201 buf[0] = idx; 201
202 for (i = 1; i <= len; i++) 202 switch (priv->small_i2c) {
203 buf[i] = regs[idx - 1 + i]; 203 case TDA18271_03_BYTE_CHUNK_INIT:
204 max = 3;
205 break;
206 case TDA18271_08_BYTE_CHUNK_INIT:
207 max = 8;
208 break;
209 case TDA18271_16_BYTE_CHUNK_INIT:
210 max = 16;
211 break;
212 case TDA18271_39_BYTE_CHUNK_INIT:
213 default:
214 max = 39;
215 }
204 216
205 tda18271_i2c_gate_ctrl(fe, 1); 217 tda18271_i2c_gate_ctrl(fe, 1);
218 while (len) {
219 if (max > len)
220 max = len;
221
222 buf[0] = idx;
223 for (i = 1; i <= max; i++)
224 buf[i] = regs[idx - 1 + i];
206 225
207 /* write registers */ 226 msg.len = max + 1;
208 ret = i2c_transfer(priv->i2c_props.adap, &msg, 1);
209 227
228 /* write registers */
229 ret = i2c_transfer(priv->i2c_props.adap, &msg, 1);
230 if (ret != 1)
231 break;
232
233 idx += max;
234 len -= max;
235 }
210 tda18271_i2c_gate_ctrl(fe, 0); 236 tda18271_i2c_gate_ctrl(fe, 0);
211 237
212 if (ret != 1) 238 if (ret != 1)
@@ -326,24 +352,7 @@ int tda18271_init_regs(struct dvb_frontend *fe)
326 regs[R_EB22] = 0x48; 352 regs[R_EB22] = 0x48;
327 regs[R_EB23] = 0xb0; 353 regs[R_EB23] = 0xb0;
328 354
329 switch (priv->small_i2c) { 355 tda18271_write_regs(fe, 0x00, TDA18271_NUM_REGS);
330 case TDA18271_08_BYTE_CHUNK_INIT:
331 tda18271_write_regs(fe, 0x00, 0x08);
332 tda18271_write_regs(fe, 0x08, 0x08);
333 tda18271_write_regs(fe, 0x10, 0x08);
334 tda18271_write_regs(fe, 0x18, 0x08);
335 tda18271_write_regs(fe, 0x20, 0x07);
336 break;
337 case TDA18271_16_BYTE_CHUNK_INIT:
338 tda18271_write_regs(fe, 0x00, 0x10);
339 tda18271_write_regs(fe, 0x10, 0x10);
340 tda18271_write_regs(fe, 0x20, 0x07);
341 break;
342 case TDA18271_39_BYTE_CHUNK_INIT:
343 default:
344 tda18271_write_regs(fe, 0x00, TDA18271_NUM_REGS);
345 break;
346 }
347 356
348 /* setup agc1 gain */ 357 /* setup agc1 gain */
349 regs[R_EB17] = 0x00; 358 regs[R_EB17] = 0x00;
diff --git a/drivers/media/common/tuners/tda18271.h b/drivers/media/common/tuners/tda18271.h
index d7fcc36dc6e6..3abb221f3d07 100644
--- a/drivers/media/common/tuners/tda18271.h
+++ b/drivers/media/common/tuners/tda18271.h
@@ -80,8 +80,9 @@ enum tda18271_output_options {
80 80
81enum tda18271_small_i2c { 81enum tda18271_small_i2c {
82 TDA18271_39_BYTE_CHUNK_INIT = 0, 82 TDA18271_39_BYTE_CHUNK_INIT = 0,
83 TDA18271_16_BYTE_CHUNK_INIT = 1, 83 TDA18271_16_BYTE_CHUNK_INIT = 16,
84 TDA18271_08_BYTE_CHUNK_INIT = 2, 84 TDA18271_08_BYTE_CHUNK_INIT = 8,
85 TDA18271_03_BYTE_CHUNK_INIT = 3,
85}; 86};
86 87
87struct tda18271_config { 88struct tda18271_config {