[PATCH v3 09/17] mmc: sdhci-msm: Fix error handling for dev_pm_opp_of_add_table()

Rajendra Nayak
2020-04-28T13:39:20Z

Even though specifying OPP's in device tree is optional, ignoring all errors
reported by dev_pm_opp_of_add_table() means we can't distinguish between a
missing OPP table and a wrong/buggy OPP table. While missing OPP table
(dev_pm_opp_of_add_table() returns a -ENODEV in such case) can be ignored,
a wrong/buggy OPP table in device tree should make the driver error out.

while we fix that, lets also fix the variable names for opp/opp_table to
avoid confusion and name them opp_table/has_opp_table instead.

Suggested-by: Matthias Kaehlcke <matthias@chromium.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Pradeep P V K <ppvk@codeaurora.org>
Cc: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>
Cc: linux-mmc@vger.kernel.org
---
drivers/mmc/host/sdhci-msm.c | 27 ++++++++++++++++-----------
1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 8a055dd..97758fa 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -244,8 +244,8 @@ struct sdhci_msm_host {
struct clk_bulk_data bulk_clks[4]; /* core, iface, cal, sleep clocks */
unsigned long clk_rate;
struct mmc_host *mmc;
- struct opp_table *opp;
- bool opp_table;
+ struct opp_table *opp_table;
+ bool has_opp_table;
bool use_14lpp_dll_reset;
bool tuning_done;
bool calibration_done;
@@ -1967,15 +1967,20 @@ static int sdhci_msm_probe(struct platform_device *pdev)
}
msm_host->bulk_clks[0].clk = clk;

- msm_host->opp = dev_pm_opp_set_clkname(&pdev->dev, "core");
- if (IS_ERR(msm_host->opp)) {
- ret = PTR_ERR(msm_host->opp);
+ msm_host->opp_table = dev_pm_opp_set_clkname(&pdev->dev, "core");
+ if (IS_ERR(msm_host->opp_table)) {
+ ret = PTR_ERR(msm_host->opp_table);
goto bus_clk_disable;
}

/* OPP table is optional */
- if (!dev_pm_opp_of_add_table(&pdev->dev))
- msm_host->opp_table = true;
+ ret = dev_pm_opp_of_add_table(&pdev->dev);
+ if (!ret) {
+ msm_host->has_opp_table = true;
+ } else if (ret != -ENODEV) {
+ dev_err(&pdev->dev, "Invalid OPP table in Device tree\n");
+ goto opp_cleanup;
+ }

/* Vote for maximum clock rate for maximum performance */
ret = dev_pm_opp_set_rate(&pdev->dev, INT_MAX);
@@ -2133,9 +2138,9 @@ static int sdhci_msm_probe(struct platform_device *pdev)
clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
msm_host->bulk_clks);
opp_cleanup:
- if (msm_host->opp_table)
+ if (msm_host->has_opp_table)
dev_pm_opp_of_remove_table(&pdev->dev);
- dev_pm_opp_put_clkname(msm_host->opp);
+ dev_pm_opp_put_clkname(msm_host->opp_table);
bus_clk_disable:
if (!IS_ERR(msm_host->bus_clk))
clk_disable_unprepare(msm_host->bus_clk);
@@ -2154,9 +2159,9 @@ static int sdhci_msm_remove(struct platform_device *pdev)

sdhci_remove_host(host, dead);

- if (msm_host->opp_table)
+ if (msm_host->has_opp_table)
dev_pm_opp_of_remove_table(&pdev->dev);
- dev_pm_opp_put_clkname(msm_host->opp);
+ dev_pm_opp_put_clkname(msm_host->opp_table);
pm_runtime_get_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);