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Commit b0c4878e authored by Devin Heitmueller's avatar Devin Heitmueller Committed by Mauro Carvalho Chehab
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[media] au8522: Fix off-by-one in SNR table for QAM256 



The table of valid SNR values for QAM 256 is off by one, and as a result
if the SNR is oscillating between 40.0 and 39.9 dB, tools like azap show
it going back and forth between 40.0 and 0 (misleading some people,
including myself, to think signal lock is being lost or there is a
problem with register reads).

Fix the table so that 40.0 dB is properly represented.

Cc: Steven Toth <stoth@kernellabs.com>
Signed-off-by: default avatarDevin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent a307cfa5

drivers/media/dvb/frontends/au8522_dig.c

+48 −48
Original line number Diff line number Diff line
@@ -157,54 +157,54 @@ static struct mse2snr_tab qam64_mse2snr_tab[] = { 


/* QAM256 SNR lookup table */

static struct mse2snr_tab qam256_mse2snr_tab[] = {

	{  16,   0 },

	{  17, 400 },

	{  18, 398 },

	{  19, 396 },

	{  20, 394 },

	{  21, 392 },

	{  22, 390 },

	{  23, 388 },

	{  24, 386 },

	{  25, 384 },

	{  26, 382 },

	{  27, 380 },

	{  28, 379 },

	{  29, 378 },

	{  30, 377 },

	{  31, 376 },

	{  32, 375 },

	{  33, 374 },

	{  34, 373 },

	{  35, 372 },

	{  36, 371 },

	{  37, 370 },

	{  38, 362 },

	{  39, 354 },

	{  40, 346 },

	{  41, 338 },

	{  42, 330 },

	{  43, 328 },

	{  44, 326 },

	{  45, 324 },

	{  46, 322 },

	{  47, 320 },

	{  48, 319 },

	{  49, 318 },

	{  50, 317 },

	{  51, 316 },

	{  52, 315 },

	{  53, 314 },

	{  54, 313 },

	{  55, 312 },

	{  56, 311 },

	{  57, 310 },

	{  58, 308 },

	{  59, 306 },

	{  60, 304 },

	{  61, 302 },

	{  62, 300 },

	{  63, 298 },

	{  15,   0 },

	{  16, 400 },

	{  17, 398 },

	{  18, 396 },

	{  19, 394 },

	{  20, 392 },

	{  21, 390 },

	{  22, 388 },

	{  23, 386 },

	{  24, 384 },

	{  25, 382 },

	{  26, 380 },

	{  27, 379 },

	{  28, 378 },

	{  29, 377 },

	{  30, 376 },

	{  31, 375 },

	{  32, 374 },

	{  33, 373 },

	{  34, 372 },

	{  35, 371 },

	{  36, 370 },

	{  37, 362 },

	{  38, 354 },

	{  39, 346 },

	{  40, 338 },

	{  41, 330 },

	{  42, 328 },

	{  43, 326 },

	{  44, 324 },

	{  45, 322 },

	{  46, 320 },

	{  47, 319 },

	{  48, 318 },

	{  49, 317 },

	{  50, 316 },

	{  51, 315 },

	{  52, 314 },

	{  53, 313 },

	{  54, 312 },

	{  55, 311 },

	{  56, 310 },

	{  57, 308 },

	{  58, 306 },

	{  59, 304 },

	{  60, 302 },

	{  61, 300 },

	{  62, 298 },

	{  65, 295 },

	{  68, 294 },

	{  70, 293 },