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drm/i915/cnl: Mask previous DDI - PLL mapping

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Without masking out the old value, we can end up pointing the DDI to a
disabled PLL, which makes the system fall over. Mask out the previous
value before setting the PLL to DDI mapping.

This can be observed by running igt/testdisplay with both an eDP and
HDMI/DP output active.

v2: Add the Bugzilla link

Fixes: 555e38d273 ("drm/i915/cnl: DDI - PLL mapping")
Testcase: igt/testdisplay
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103997
Cc: Rodrigo Vivi <[email protected]>
Cc: Matt Atwood <[email protected]>
Signed-off-by: James Ausmus <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Tested-by: Rodrigo Vivi <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 23a7068ec5)
Signed-off-by: Joonas Lahtinen <[email protected]>
This commit is contained in:
James Ausmus 2017-11-30 18:17:00 -08:00 • committed by Joonas Lahtinen
commit 46442beed9
1 changed files with 1 additions and 0 deletions
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1
drivers/gpu/drm/i915/intel_ddi.c
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@ -2131,6 +2131,7 @@ static void intel_ddi_clk_select(struct intel_encoder *encoder,
if (IS_CANNONLAKE(dev_priv)) {
/* Configure DPCLKA_CFGCR0 to map the DPLL to the DDI. */
val = I915_READ(DPCLKA_CFGCR0);
val &= ~DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port);
val |= DPCLKA_CFGCR0_DDI_CLK_SEL(pll->id, port);
I915_WRITE(DPCLKA_CFGCR0, val);