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drm/omap: pll: fix iteration loop check

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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
This commit is contained in:
Tomi Valkeinen 2020-12-15 12:46:31 +02:00
parent 0073b8cd43
commit 4119bd55e4
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/omapdrm/dss/pll.c
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@ -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;