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soundwire: Revert "soundwire: qcom: Add set_channel_map api support"

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This reverts commit 7796c97df6.

This patch broke Dragonboard 845c (sdm845). I see:

    Unexpected kernel BRK exception at EL1
    Internal error: BRK handler: 00000000f20003e8 [#1]  SMP
    pc : qcom_swrm_set_channel_map+0x7c/0x80 [soundwire_qcom]
    lr : snd_soc_dai_set_channel_map+0x34/0x78
    Call trace:
     qcom_swrm_set_channel_map+0x7c/0x80 [soundwire_qcom] (P)
     sdm845_dai_init+0x18c/0x2e0 [snd_soc_sdm845]
     snd_soc_link_init+0x28/0x6c
     snd_soc_bind_card+0x5f4/0xb0c
     snd_soc_register_card+0x148/0x1a4
     devm_snd_soc_register_card+0x50/0xb0
     sdm845_snd_platform_probe+0x124/0x148 [snd_soc_sdm845]
     platform_probe+0x6c/0xd0
     really_probe+0xc0/0x2a4
     __driver_probe_device+0x7c/0x130
     driver_probe_device+0x40/0x118
     __device_attach_driver+0xc4/0x108
     bus_for_each_drv+0x8c/0xf0
     __device_attach+0xa4/0x198
     device_initial_probe+0x18/0x28
     bus_probe_device+0xb8/0xbc
     deferred_probe_work_func+0xac/0xfc
     process_one_work+0x244/0x658
     worker_thread+0x1b4/0x360
     kthread+0x148/0x228
     ret_from_fork+0x10/0x20
    Kernel panic - not syncing: BRK handler: Fatal exception

Dan has also reported following issues with the original patch
https://lore.kernel.org/all/33fe8fe7-719a-405a-9ed2-d9f816ce1d57@sabinyo.mountain/

Bug #1:
The zeroeth element of ctrl->pconfig[] is supposed to be unused.  We
start counting at 1.  However this code sets ctrl->pconfig[0].ch_mask = 128.

Bug #2:
There are SLIM_MAX_TX_PORTS (16) elements in tx_ch[] array but only
QCOM_SDW_MAX_PORTS + 1 (15) in the ctrl->pconfig[] array so it corrupts
memory like Yongqin Liu pointed out.

Bug 3:
Like Jie Gan pointed out, it erases all the tx information with the rx
information.

Cc: stable@vger.kernel.org # v6.15+
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Acked-by: Srinivas Kandagatla <srini@kernel.org>
Link: https://lore.kernel.org/r/20250709174949.8541-1-amit.pundir@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Amit Pundir 2025-07-09 23:19:49 +05:30 committed by Vinod Koul
parent a628e69b64
commit 834bce6a71
1 changed files with 0 additions and 26 deletions
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26
drivers/soundwire/qcom.c
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@ -156,7 +156,6 @@ struct qcom_swrm_port_config {
u8 word_length;
u8 blk_group_count;
u8 lane_control;
u8 ch_mask;
};
/*
@ -1049,13 +1048,9 @@ static int qcom_swrm_port_enable(struct sdw_bus *bus,
{
u32 reg = SWRM_DP_PORT_CTRL_BANK(enable_ch->port_num, bank);
struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus);
struct qcom_swrm_port_config *pcfg;
u32 val;
pcfg = &ctrl->pconfig[enable_ch->port_num];
ctrl->reg_read(ctrl, reg, &val);
if (pcfg->ch_mask != SWR_INVALID_PARAM && pcfg->ch_mask != 0)
enable_ch->ch_mask = pcfg->ch_mask;
if (enable_ch->enable)
val |= (enable_ch->ch_mask << SWRM_DP_PORT_CTRL_EN_CHAN_SHFT);
@ -1275,26 +1270,6 @@ static void *qcom_swrm_get_sdw_stream(struct snd_soc_dai *dai, int direction)
return ctrl->sruntime[dai->id];
}
static int qcom_swrm_set_channel_map(struct snd_soc_dai *dai,
unsigned int tx_num, const unsigned int *tx_slot,
unsigned int rx_num, const unsigned int *rx_slot)
{
struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev);
int i;
if (tx_slot) {
for (i = 0; i < tx_num; i++)
ctrl->pconfig[i].ch_mask = tx_slot[i];
}
if (rx_slot) {
for (i = 0; i < rx_num; i++)
ctrl->pconfig[i].ch_mask = rx_slot[i];
}
return 0;
}
static int qcom_swrm_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
@ -1331,7 +1306,6 @@ static const struct snd_soc_dai_ops qcom_swrm_pdm_dai_ops = {
.shutdown = qcom_swrm_shutdown,
.set_stream = qcom_swrm_set_sdw_stream,
.get_stream = qcom_swrm_get_sdw_stream,
.set_channel_map = qcom_swrm_set_channel_map,
};
static const struct snd_soc_component_driver qcom_swrm_dai_component = {