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drm/msm/dsi: do not try reading 28nm vco rate if it's not enabled

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Reading VCO rate for this PLL can cause boot stalls, if it is not
enabled. Guard clk_hw_get_rate with a call to
dsi_pll_28nm_clk_is_enabled().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Dmitry Baryshkov 2020-10-30 18:12:07 +03:00 committed by Rob Clark
parent 5785dd7a8e
commit 0e720ea8de
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/msm/dsi/pll/dsi_pll_28nm.c
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@ -447,7 +447,10 @@ static void dsi_pll_28nm_save_state(struct msm_dsi_pll *pll)
cached_state->postdiv1 =
pll_read(base + REG_DSI_28nm_PHY_PLL_POSTDIV1_CFG);
cached_state->byte_mux = pll_read(base + REG_DSI_28nm_PHY_PLL_VREG_CFG);
cached_state->vco_rate = clk_hw_get_rate(&pll->clk_hw);
if (dsi_pll_28nm_clk_is_enabled(&pll->clk_hw))
cached_state->vco_rate = clk_hw_get_rate(&pll->clk_hw);
else
cached_state->vco_rate = 0;
}
static int dsi_pll_28nm_restore_state(struct msm_dsi_pll *pll)