Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751438AbdLNH3e (ORCPT ); Thu, 14 Dec 2017 02:29:34 -0500 Received: from mirror2.csie.ntu.edu.tw ([140.112.30.76]:37844 "EHLO wens.csie.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751098AbdLNH3c (ORCPT ); Thu, 14 Dec 2017 02:29:32 -0500 From: Chen-Yu Tsai To: Liam Girdwood , Mark Brown , Maxime Ripard Cc: Chen-Yu Tsai , alsa-devel@alsa-project.org, linux-sunxi@googlegroups.com, linux-kernel@vger.kernel.org, Code Kipper Subject: [PATCH] ASoC: sun4i-i2s: Show detailed error when DAI configuration callbacks fail Date: Thu, 14 Dec 2017 15:29:28 +0800 Message-Id: <20171214072928.6613-1-wens@csie.org> X-Mailer: git-send-email 2.15.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4850 Lines: 149 When any of the DAI hardware configuration callbacks (.hw_param, .set_fmt, .set_sysclk) fails, there is no explanation about why it failed. This is particularly confusing for .hw_param, which covers many parameters of the DAI. Telling the users what parameter isn't supported, and what the requested value was goes a long way for developers trying to combine sun4i-i2s with external codecs. This patch adds dev_err calls explaining what isn't supported or failed, and what the value was. sun4i_i2s_set_clk_rate()'s first parameter was changed to a struct snd_soc_dai *dai, so we can get the underlying device. Signed-off-by: Chen-Yu Tsai --- sound/soc/sunxi/sun4i-i2s.c | 36 ++++++++++++++++++++++++++++++------ 1 file changed, 30 insertions(+), 6 deletions(-) diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c index 13d7ecabe1b6..dca1143c1150 100644 --- a/sound/soc/sunxi/sun4i-i2s.c +++ b/sound/soc/sunxi/sun4i-i2s.c @@ -269,10 +269,11 @@ static bool sun4i_i2s_oversample_is_valid(unsigned int oversample) return false; } -static int sun4i_i2s_set_clk_rate(struct sun4i_i2s *i2s, +static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai, unsigned int rate, unsigned int word_size) { + struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai); unsigned int oversample_rate, clk_rate; int bclk_div, mclk_div; int ret; @@ -300,6 +301,7 @@ static int sun4i_i2s_set_clk_rate(struct sun4i_i2s *i2s, break; default: + dev_err(dai->dev, "Unsupported sample rate: %u\n", rate); return -EINVAL; } @@ -308,18 +310,25 @@ static int sun4i_i2s_set_clk_rate(struct sun4i_i2s *i2s, return ret; oversample_rate = i2s->mclk_freq / rate; - if (!sun4i_i2s_oversample_is_valid(oversample_rate)) + if (!sun4i_i2s_oversample_is_valid(oversample_rate)) { + dev_err(dai->dev, "Unsupported oversample rate: %d\n", + oversample_rate); return -EINVAL; + } bclk_div = sun4i_i2s_get_bclk_div(i2s, oversample_rate, word_size); - if (bclk_div < 0) + if (bclk_div < 0) { + dev_err(dai->dev, "Unsupported BCLK divider: %d\n", bclk_div); return -EINVAL; + } mclk_div = sun4i_i2s_get_mclk_div(i2s, oversample_rate, clk_rate, rate); - if (mclk_div < 0) + if (mclk_div < 0) { + dev_err(dai->dev, "Unsupported MCLK divider: %d\n", mclk_div); return -EINVAL; + } /* Adjust the clock division values if needed */ bclk_div += i2s->variant->bclk_offset; @@ -349,8 +358,11 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream, u32 width; channels = params_channels(params); - if (channels != 2) + if (channels != 2) { + dev_err(dai->dev, "Unsupported number of channels: %d\n", + channels); return -EINVAL; + } if (i2s->variant->has_chcfg) { regmap_update_bits(i2s->regmap, SUN8I_I2S_CHAN_CFG_REG, @@ -382,6 +394,8 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream, width = DMA_SLAVE_BUSWIDTH_2_BYTES; break; default: + dev_err(dai->dev, "Unsupported physical sample width: %d\n", + params_physical_width(params)); return -EINVAL; } i2s->playback_dma_data.addr_width = width; @@ -393,6 +407,8 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream, break; default: + dev_err(dai->dev, "Unsupported sample width: %d\n", + params_width(params)); return -EINVAL; } @@ -401,7 +417,7 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream, regmap_field_write(i2s->field_fmt_sr, sr + i2s->variant->fmt_offset); - return sun4i_i2s_set_clk_rate(i2s, params_rate(params), + return sun4i_i2s_set_clk_rate(dai, params_rate(params), params_width(params)); } @@ -426,6 +442,8 @@ static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) val = SUN4I_I2S_FMT0_FMT_RIGHT_J; break; default: + dev_err(dai->dev, "Unsupported format: %d\n", + fmt & SND_SOC_DAIFMT_FORMAT_MASK); return -EINVAL; } @@ -464,6 +482,8 @@ static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) case SND_SOC_DAIFMT_NB_NF: break; default: + dev_err(dai->dev, "Unsupported clock polarity: %d\n", + fmt & SND_SOC_DAIFMT_INV_MASK); return -EINVAL; } @@ -482,6 +502,8 @@ static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) val = SUN4I_I2S_CTRL_MODE_SLAVE; break; default: + dev_err(dai->dev, "Unsupported slave setting: %d\n", + fmt & SND_SOC_DAIFMT_MASTER_MASK); return -EINVAL; } regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG, @@ -504,6 +526,8 @@ static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) val = 0; break; default: + dev_err(dai->dev, "Unsupported slave setting: %d\n", + fmt & SND_SOC_DAIFMT_MASTER_MASK); return -EINVAL; } regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG, -- 2.15.0