On Thu, 7 Nov 2024 at 13:12, Andy-ld Lu <andy-ld.lu@xxxxxxxxxxxx> wrote:
>
> In the probe function, it goes to 'release_mem' label and returns after
> some procedure failure. But if the clocks (partial or all) have been
> enabled previously, they would not be disabled in msdc_runtime_suspend,
> since runtime PM is not yet enabled for this case.
>
> That cause mmc related clocks always on during system suspend and block
> suspend flow. Below log is from a SDCard issue of MT8196 chromebook, it
> returns -ETIMEOUT while polling clock stable in the msdc_ungate_clock()
> and probe failed, but the enabled clocks could not be disabled anyway.
>
> [ 129.059253] clk_chk_dev_pm_suspend()
> [ 129.350119] suspend warning: msdcpll is on
> [ 129.354494] [ck_msdc30_1_sel : enabled, 1, 1, 191999939, ck_msdcpll_d2]
> [ 129.362787] [ck_msdcpll_d2 : enabled, 1, 1, 191999939, msdcpll]
> [ 129.371041] [ck_msdc30_1_ck : enabled, 1, 1, 191999939, ck_msdc30_1_sel]
> [ 129.379295] [msdcpll : enabled, 1, 1, 383999878, clk26m]
>
> Add a new 'release_clk' label and reorder the error handle functions to
> make sure the clocks be disabled after probe failure.
>
> Fixes: ffaea6ebfe9c ("mmc: mtk-sd: Use readl_poll_timeout instead of open-coded polling")
> Fixes: 7a2fa8eed936 ("mmc: mtk-sd: use devm_mmc_alloc_host")
> Signed-off-by: Andy-ld Lu <andy-ld.lu@xxxxxxxxxxxx>
This didn't apply on fixes the branch, but only on next. That said, I
have queued this up for next and added a stable tag.
Note that, this means that the fix needs to be backported manually,
but I leave that to you or someone else to take care of.
Thanks and kind regards
Uffe
> ---
> Changes in v2:
> - Add the relevant fixes tags.
>
> ---
> drivers/mmc/host/mtk-sd.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index a2750a45c1b7..022526a1f754 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -3007,7 +3007,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
> ret = msdc_ungate_clock(host);
> if (ret) {
> dev_err(&pdev->dev, "Cannot ungate clocks!\n");
> - goto release_mem;
> + goto release_clk;
> }
> msdc_init_hw(host);
>
> @@ -3017,14 +3017,14 @@ static int msdc_drv_probe(struct platform_device *pdev)
> GFP_KERNEL);
> if (!host->cq_host) {
> ret = -ENOMEM;
> - goto release_mem;
> + goto release;
> }
> host->cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
> host->cq_host->mmio = host->base + 0x800;
> host->cq_host->ops = &msdc_cmdq_ops;
> ret = cqhci_init(host->cq_host, mmc, true);
> if (ret)
> - goto release_mem;
> + goto release;
> mmc->max_segs = 128;
> /* cqhci 16bit length */
> /* 0 size, means 65536 so we don't have to -1 here */
> @@ -3064,9 +3064,10 @@ static int msdc_drv_probe(struct platform_device *pdev)
> end:
> pm_runtime_disable(host->dev);
> release:
> - platform_set_drvdata(pdev, NULL);
> msdc_deinit_hw(host);
> +release_clk:
> msdc_gate_clock(host);
> + platform_set_drvdata(pdev, NULL);
> release_mem:
> if (host->dma.gpd)
> dma_free_coherent(&pdev->dev,
> --
> 2.46.0
>
