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    Subject[PATCH 4.4 44/72] drm/msm/dsi: save pll state before dsi host is powered off
    Date
    From: Harigovindan P <harigovi@codeaurora.org>

    [ Upstream commit a1028dcfd0dd97884072288d0c8ed7f30399b528 ]

    Save pll state before dsi host is powered off. Without this change
    some register values gets resetted.

    Signed-off-by: Harigovindan P <harigovi@codeaurora.org>
    Signed-off-by: Rob Clark <robdclark@chromium.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/msm/dsi/dsi_manager.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
    index 439dfb69e2ef8..34220df1265f5 100644
    --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
    +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
    @@ -434,6 +434,7 @@ static void dsi_mgr_bridge_post_disable(struct drm_bridge *bridge)
    struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
    struct mipi_dsi_host *host = msm_dsi->host;
    struct drm_panel *panel = msm_dsi->panel;
    + struct msm_dsi_pll *src_pll;
    bool is_dual_dsi = IS_DUAL_DSI();
    int ret;

    @@ -467,6 +468,10 @@ static void dsi_mgr_bridge_post_disable(struct drm_bridge *bridge)
    id, ret);
    }

    + /* Save PLL status if it is a clock source */
    + src_pll = msm_dsi_phy_get_pll(msm_dsi->phy);
    + msm_dsi_pll_save_state(src_pll);
    +
    ret = msm_dsi_host_power_off(host);
    if (ret)
    pr_err("%s: host %d power off failed,%d\n", __func__, id, ret);
    --
    2.20.1


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