Allow calling intel_dsi_get_pclk without passing in an intel_crtc_state.
This is a preparation patch for reading back the GOP configured DSI
clk during probe.
Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
drivers/gpu/drm/i915/intel_dsi_pll.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c
b/drivers/gpu/drm/i915/intel_dsi_pll.c
index 2ff2ee7f3b78..71ce6e3157d4 100644
--- a/drivers/gpu/drm/i915/intel_dsi_pll.c
+++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
@@ -279,8 +279,10 @@ static u32 vlv_dsi_get_pclk(struct intel_encoder *encoder,
int pipe_bpp,
pll_div = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_DIVIDER);
mutex_unlock(&dev_priv->sb_lock);
- config->dsi_pll.ctrl = pll_ctl & ~DSI_PLL_LOCK;
- config->dsi_pll.div = pll_div;
+ if (config) {
+ config->dsi_pll.ctrl = pll_ctl & ~DSI_PLL_LOCK;
+ config->dsi_pll.div = pll_div;
+ }
/* mask out other bits and extract the P1 divisor */
pll_ctl &= DSI_PLL_P1_POST_DIV_MASK;
@@ -330,6 +332,7 @@ static u32 vlv_dsi_get_pclk(struct intel_encoder *encoder,
int pipe_bpp,
static u32 bxt_dsi_get_pclk(struct intel_encoder *encoder, int pipe_bpp,
struct intel_crtc_state *config)
{
+ u32 ctrl;
u32 pclk;
u32 dsi_clk;
u32 dsi_ratio;
@@ -342,9 +345,12 @@ static u32 bxt_dsi_get_pclk(struct intel_encoder *encoder,
int pipe_bpp,
return 0;
}
- config->dsi_pll.ctrl = I915_READ(BXT_DSI_PLL_CTL);
+ ctrl = I915_READ(BXT_DSI_PLL_CTL);
+
+ if (config)
+ config->dsi_pll.ctrl = ctrl;
- dsi_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
+ dsi_ratio = ctrl & BXT_DSI_PLL_RATIO_MASK;
dsi_clk = (dsi_ratio * BXT_REF_CLOCK_KHZ) / 2;
--
2.17.1
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