tree: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git topic/stm32 head: 5914d285f6b782892a91d6621723fdc41a775b15 commit: 61fb4ff70377cd2c49a3487bdb0156eba6930072 [5/7] ASoC: stm32: sai: Move static settings to DAI init config: xtensa-allyesconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 4.9.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 61fb4ff70377cd2c49a3487bdb0156eba6930072 # save the attached .config to linux build tree make.cross ARCH=xtensa

Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

sound/soc/stm/stm32_sai_sub.c: In function 'stm32_sai_hw_params':

...

sound/soc/stm/stm32_sai_sub.c:467:7: warning: 'cr1' may be used uninitialized in this function [-Wmaybe-uninitialized]

cr1 |= SAI_XCR1_DS_SET(SAI_DATASIZE_8); ^ sound/soc/stm/stm32_sai_sub.c:451:6: note: 'cr1' was declared here int cr1, cr1_mask, ret; ^

vim +/cr1 +467 sound/soc/stm/stm32_sai_sub.c

3e086edf olivier moysan 2017-04-10 445 3e086edf olivier moysan 2017-04-10 446 static int stm32_sai_set_config(struct snd_soc_dai *cpu_dai, 3e086edf olivier moysan 2017-04-10 447 struct snd_pcm_substream *substream, 3e086edf olivier moysan 2017-04-10 448 struct snd_pcm_hw_params *params) 3e086edf olivier moysan 2017-04-10 449 { 3e086edf olivier moysan 2017-04-10 450 struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); 3e086edf olivier moysan 2017-04-10 451 int cr1, cr1_mask, ret; 3e086edf olivier moysan 2017-04-10 452 a4529d2b Olivier Moysan 2017-10-19 453 /* a4529d2b Olivier Moysan 2017-10-19 454 * DMA bursts increment is set to 4 words. a4529d2b Olivier Moysan 2017-10-19 455 * SAI fifo threshold is set to half fifo, to keep enough space a4529d2b Olivier Moysan 2017-10-19 456 * for DMA incoming bursts. a4529d2b Olivier Moysan 2017-10-19 457 */ 3e086edf olivier moysan 2017-04-10 458 regmap_update_bits(sai->regmap, STM_SAI_CR2_REGX, 3e086edf olivier moysan 2017-04-10 459 SAI_XCR2_FFLUSH | SAI_XCR2_FTH_MASK, a4529d2b Olivier Moysan 2017-10-19 460 SAI_XCR2_FFLUSH | a4529d2b Olivier Moysan 2017-10-19 461 SAI_XCR2_FTH_SET(STM_SAI_FIFO_TH_HALF)); 3e086edf olivier moysan 2017-04-10 462 3e086edf olivier moysan 2017-04-10 463 /* Mode, data format and channel config */ 61fb4ff7 Olivier Moysan 2017-10-19 464 cr1_mask = SAI_XCR1_DS_MASK; 3e086edf olivier moysan 2017-04-10 465 switch (params_format(params)) { 3e086edf olivier moysan 2017-04-10 466 case SNDRV_PCM_FORMAT_S8: 3e086edf olivier moysan 2017-04-10 @467 cr1 |= SAI_XCR1_DS_SET(SAI_DATASIZE_8); 3e086edf olivier moysan 2017-04-10 468 break; 3e086edf olivier moysan 2017-04-10 469 case SNDRV_PCM_FORMAT_S16_LE: 3e086edf olivier moysan 2017-04-10 470 cr1 |= SAI_XCR1_DS_SET(SAI_DATASIZE_16); 3e086edf olivier moysan 2017-04-10 471 break; 3e086edf olivier moysan 2017-04-10 472 case SNDRV_PCM_FORMAT_S32_LE: 3e086edf olivier moysan 2017-04-10 473 cr1 |= SAI_XCR1_DS_SET(SAI_DATASIZE_32); 3e086edf olivier moysan 2017-04-10 474 break; 3e086edf olivier moysan 2017-04-10 475 default: 3e086edf olivier moysan 2017-04-10 476 dev_err(cpu_dai->dev, "Data format not supported"); 3e086edf olivier moysan 2017-04-10 477 return -EINVAL; 3e086edf olivier moysan 2017-04-10 478 } 3e086edf olivier moysan 2017-04-10 479 3e086edf olivier moysan 2017-04-10 480 cr1_mask |= SAI_XCR1_MONO; 3e086edf olivier moysan 2017-04-10 481 if ((sai->slots == 2) && (params_channels(params) == 1)) 3e086edf olivier moysan 2017-04-10 482 cr1 |= SAI_XCR1_MONO; 3e086edf olivier moysan 2017-04-10 483 3e086edf olivier moysan 2017-04-10 484 ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, cr1_mask, cr1); 3e086edf olivier moysan 2017-04-10 485 if (ret < 0) { 3e086edf olivier moysan 2017-04-10 486 dev_err(cpu_dai->dev, "Failed to update CR1 register\n"); 3e086edf olivier moysan 2017-04-10 487 return ret; 3e086edf olivier moysan 2017-04-10 488 } 3e086edf olivier moysan 2017-04-10 489 3e086edf olivier moysan 2017-04-10 490 return 0; 3e086edf olivier moysan 2017-04-10 491 } 3e086edf olivier moysan 2017-04-10 492

:::::: The code at line 467 was first introduced by commit :::::: 3e086edfe0c73daaabd929b926bbe26536272d9a ASoC: stm32: add SAI driver

:::::: TO: olivier moysan olivier.moysan@st.com :::::: CC: Mark Brown broonie@kernel.org

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