| Message ID | 20240828131915.3198081-1-nm@ti.com |
|---|---|
| State | New |
| Headers | show |
| Series | cpufreq: ti-cpufreq: Introduce quirks to handle syscon fails appropriately | expand |
Hi, On Aug 28, 2024 at 08:19:15 -0500, Nishanth Menon wrote: > Commit b4bc9f9e27ed ("cpufreq: ti-cpufreq: add support for omap34xx > and omap36xx") introduced special handling for OMAP3 class devices > where syscon node may not be present. However, this also creates a bug > where the syscon node is present, however the offset used to read > is beyond the syscon defined range. > > Fix this by providing a quirk option that is populated when such > special handling is required. This allows proper failure for all other > platforms when the syscon node and efuse offsets are mismatched. > > Fixes: b4bc9f9e27ed ("cpufreq: ti-cpufreq: add support for omap34xx and omap36xx") > Signed-off-by: Nishanth Menon <nm@ti.com> > --- > > NOTE: this combined with https://lore.kernel.org/r/20240828121008.3066002-1-nm@ti.com > has created a bunch of un-intended bugs on other TI SoCs such > as seen in https://lore.kernel.org/all/20240826-opp-v3-1-0934f8309e13@ti.com/ > https://lore.kernel.org/all/20240827131342.6wrielete3yeoinl@bryanbrattlof.com/ > etc. I have been able to verify that this doesn't cause any regressions on AM62x cpufreq, logs [0]. I also applied the other syscon patch mentioned above. So, Tested-by: Dhruva Gole <d-gole@ti.com> [0] https://gist.github.com/DhruvaG2000/153b5511889180ee54703603428fb77e
Nishanth Menon <nm@ti.com> writes: > Commit b4bc9f9e27ed ("cpufreq: ti-cpufreq: add support for omap34xx > and omap36xx") introduced special handling for OMAP3 class devices > where syscon node may not be present. However, this also creates a bug > where the syscon node is present, however the offset used to read > is beyond the syscon defined range. > > Fix this by providing a quirk option that is populated when such > special handling is required. This allows proper failure for all other > platforms when the syscon node and efuse offsets are mismatched. > > Fixes: b4bc9f9e27ed ("cpufreq: ti-cpufreq: add support for omap34xx and omap36xx") > Signed-off-by: Nishanth Menon <nm@ti.com> > --- > > NOTE: this combined with https://lore.kernel.org/r/20240828121008.3066002-1-nm@ti.com > has created a bunch of un-intended bugs on other TI SoCs such > as seen in https://lore.kernel.org/all/20240826-opp-v3-1-0934f8309e13@ti.com/ > https://lore.kernel.org/all/20240827131342.6wrielete3yeoinl@bryanbrattlof.com/ > etc. Reviewed-by: Kevin Hilman <khilman@baylibre.com>
On 28-08-24, 08:19, Nishanth Menon wrote: > Commit b4bc9f9e27ed ("cpufreq: ti-cpufreq: add support for omap34xx > and omap36xx") introduced special handling for OMAP3 class devices > where syscon node may not be present. However, this also creates a bug > where the syscon node is present, however the offset used to read > is beyond the syscon defined range. > > Fix this by providing a quirk option that is populated when such > special handling is required. This allows proper failure for all other > platforms when the syscon node and efuse offsets are mismatched. > > Fixes: b4bc9f9e27ed ("cpufreq: ti-cpufreq: add support for omap34xx and omap36xx") > Signed-off-by: Nishanth Menon <nm@ti.com> > --- > Applied. Thanks.
diff --git a/drivers/cpufreq/ti-cpufreq.c b/drivers/cpufreq/ti-cpufreq.c index 220fff7a302e..804329e81eb8 100644 --- a/drivers/cpufreq/ti-cpufreq.c +++ b/drivers/cpufreq/ti-cpufreq.c @@ -90,6 +90,9 @@ struct ti_cpufreq_soc_data { unsigned long efuse_shift; unsigned long rev_offset; bool multi_regulator; +/* Backward compatibility hack: Might have missing syscon */ +#define TI_QUIRK_SYSCON_MAY_BE_MISSING 0x1 + u8 quirks; }; struct ti_cpufreq_data { @@ -254,6 +257,7 @@ static struct ti_cpufreq_soc_data omap34xx_soc_data = { .efuse_mask = BIT(3), .rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE, .multi_regulator = false, + .quirks = TI_QUIRK_SYSCON_MAY_BE_MISSING, }; /* @@ -281,6 +285,7 @@ static struct ti_cpufreq_soc_data omap36xx_soc_data = { .efuse_mask = BIT(9), .rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE, .multi_regulator = true, + .quirks = TI_QUIRK_SYSCON_MAY_BE_MISSING, }; /* @@ -295,6 +300,7 @@ static struct ti_cpufreq_soc_data am3517_soc_data = { .efuse_mask = 0, .rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE, .multi_regulator = false, + .quirks = TI_QUIRK_SYSCON_MAY_BE_MISSING, }; static struct ti_cpufreq_soc_data am625_soc_data = { @@ -340,7 +346,7 @@ static int ti_cpufreq_get_efuse(struct ti_cpufreq_data *opp_data, ret = regmap_read(opp_data->syscon, opp_data->soc_data->efuse_offset, &efuse); - if (ret == -EIO) { + if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_MAY_BE_MISSING && ret == -EIO) { /* not a syscon register! */ void __iomem *regs = ioremap(OMAP3_SYSCON_BASE + opp_data->soc_data->efuse_offset, 4); @@ -381,7 +387,7 @@ static int ti_cpufreq_get_rev(struct ti_cpufreq_data *opp_data, ret = regmap_read(opp_data->syscon, opp_data->soc_data->rev_offset, &revision); - if (ret == -EIO) { + if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_MAY_BE_MISSING && ret == -EIO) { /* not a syscon register! */ void __iomem *regs = ioremap(OMAP3_SYSCON_BASE + opp_data->soc_data->rev_offset, 4);
Commit b4bc9f9e27ed ("cpufreq: ti-cpufreq: add support for omap34xx and omap36xx") introduced special handling for OMAP3 class devices where syscon node may not be present. However, this also creates a bug where the syscon node is present, however the offset used to read is beyond the syscon defined range. Fix this by providing a quirk option that is populated when such special handling is required. This allows proper failure for all other platforms when the syscon node and efuse offsets are mismatched. Fixes: b4bc9f9e27ed ("cpufreq: ti-cpufreq: add support for omap34xx and omap36xx") Signed-off-by: Nishanth Menon <nm@ti.com> --- NOTE: this combined with https://lore.kernel.org/r/20240828121008.3066002-1-nm@ti.com has created a bunch of un-intended bugs on other TI SoCs such as seen in https://lore.kernel.org/all/20240826-opp-v3-1-0934f8309e13@ti.com/ https://lore.kernel.org/all/20240827131342.6wrielete3yeoinl@bryanbrattlof.com/ etc. drivers/cpufreq/ti-cpufreq.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)