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drm/i915: Clear pipe's pll hw state in hsw_dp_set_ddi_pll_sel()

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Similarly to what is done for SKL, clear the dpll_hw_state of the pipe
config in hsw_dp_set_ddi_pll_sel(), since it main contain stale values.
That can happen if a crtc that was previously driving an HDMI connector
switches to a DP connector. In that case, the wrpll field was left with
its old value, leading to warnings like the one below:

[drm:check_crtc_state [i915]] *ERROR* mismatch in dpll_hw_state.wrpll (expected 0xb035061f, found 0x00000000)
------------[ cut here ]------------
WARNING: CPU: 1 PID: 767 at drivers/gpu/drm/i915/intel_display.c:12324 check_crtc_state+0x975/0x10b0 [i915]()
pipe state doesn't match!

This regression was indroduced in

commit dd3cd74acf
Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Date:   Fri May 15 13:34:29 2015 +0300

    drm/i915: Don't overwrite (e)DP PLL selection on SKL

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Tested-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ander Conselvan de Oliveira 2015-06-30 16:10:38 +03:00 committed by Jani Nikula
parent 2059ac3b13
commit ee46f3c7d7
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_dp.c
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@ -1141,6 +1141,9 @@ skl_edp_set_pll_config(struct intel_crtc_state *pipe_config, int link_clock)
static void
hsw_dp_set_ddi_pll_sel(struct intel_crtc_state *pipe_config, int link_bw)
{
memset(&pipe_config->dpll_hw_state, 0,
sizeof(pipe_config->dpll_hw_state));
switch (link_bw) {
case DP_LINK_BW_1_62:
pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_810;