diff options
| author | Venkat Gopalakrishnan <venkatg@codeaurora.org> | 2013-03-11 12:17:57 -0700 |
|---|---|---|
| committer | Subhash Jadavani <subhashj@codeaurora.org> | 2016-05-27 10:28:31 -0700 |
| commit | c071dd5ae5fd4d69e4d73edc034a77f5af8c7355 (patch) | |
| tree | 914ea77fbde5983c289331ed0c9355c03695f1b5 /drivers/mmc/host | |
| parent | 97bdc9cac7be74f770c8a7da5f2491e551a85194 (diff) | |
mmc: sdhci-msm: Disable SDHC slots at bootup if required
Add support to disable available SDHC slots at bootup controlled via a
module param with a bit mask of slots to disable. QDSS is one use case
where SDHC slot is disabled for trace output.
Example Usage:
Passing sdhci_msm.disable_slots=1 as kernel command line argument would
disable SDHC slot 1, whereas passing sdhci_msm.disable_slots=3 would
disable both slots 1 and 2.
Change-Id: I97bc517adfe4a1a81a97a2789d77404b0f22b124
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/sdhci-msm.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index a21dde2d694e..8c077135d1c2 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -101,6 +101,10 @@ static const u32 tuning_block_128[] = { 0xFFFFBBBB, 0xFFFF77FF, 0xFF7777FF, 0xEEDDBB77 }; +static int disable_slots; +/* root can write, others read */ +module_param(disable_slots, int, S_IRUGO|S_IWUSR); + /* This structure keeps information per regulator */ struct sdhci_msm_reg_data { /* voltage regulator handle */ @@ -2029,6 +2033,19 @@ static int sdhci_msm_probe(struct platform_device *pdev) /* Extract platform data */ if (pdev->dev.of_node) { + ret = of_alias_get_id(pdev->dev.of_node, "sdhc"); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to get slot index %d\n", + ret); + goto pltfm_free; + } + if (disable_slots & (1 << (ret - 1))) { + dev_info(&pdev->dev, "%s: Slot %d disabled\n", __func__, + ret); + ret = -ENODEV; + goto pltfm_free; + } + msm_host->pdata = sdhci_msm_populate_pdata(&pdev->dev); if (!msm_host->pdata) { dev_err(&pdev->dev, "DT parsing error\n"); |