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| author | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2020-12-15 11:46:31 +0100 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2020-12-15 15:17:30 +0100 |
| commit | 4119bd55e40fa6b20f0f0513487af2c2221741c8 (patch) | |
| tree | 77e760df600995affdc71adc294aa341a88224ec /drivers/gpu/drm/omapdrm/dss | |
| parent | ARM: dts: omap5: add address-cells & size-cells to dsi (diff) | |
| download | linux-4119bd55e40fa6b20f0f0513487af2c2221741c8.tar.xz linux-4119bd55e40fa6b20f0f0513487af2c2221741c8.zip | |
drm/omap: pll: fix iteration loop check
If the PLL calc function is given bad parameters, n_start/m_start may be
higher than n_stop/m_stop, which leads to the loops iterating through
the whole u32 number space.
Fix this by failing early on such cases.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215104657.802264-59-tomi.valkeinen@ti.com
Diffstat (limited to 'drivers/gpu/drm/omapdrm/dss')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/dss/pll.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/dss/pll.c b/drivers/gpu/drm/omapdrm/dss/pll.c index 241a338ace29..4c8246a3ded9 100644 --- a/drivers/gpu/drm/omapdrm/dss/pll.c +++ b/drivers/gpu/drm/omapdrm/dss/pll.c @@ -222,6 +222,9 @@ bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin, n_stop = min((unsigned)(clkin / fint_hw_min), hw->n_max); n_inc = 1; + if (n_start > n_stop) + return false; + if (hw->errata_i886) { swap(n_start, n_stop); n_inc = -1; @@ -239,6 +242,9 @@ bool dss_pll_calc_a(const struct dss_pll *pll, unsigned long clkin, hw->m_max); m_inc = 1; + if (m_start > m_stop) + continue; + if (hw->errata_i886) { swap(m_start, m_stop); m_inc = -1; |