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drm/i915/bxt: add DDI port HW readout support 

Add support for reading out the HW state for DDI ports. Since the actual
programming is very similar to the CHV/VLV DPIO PLL programming we can
reuse much of the logic from there.

This fixes the state checker failures I saw on my BXT with HDMI output.

v2:
- rebased on v2 of patch 4/5

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Imre Deak 2015-06-22 23:35:52 +03:00 committed by Daniel Vetter
parent dccbea3b07
commit aa610dcb7c
2 changed files with 29 additions and 8 deletions
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15
drivers/gpu/drm/i915/i915_reg.h
View File

@ -1170,10 +1170,12 @@ enum skl_disp_power_wells {
#define _PORT_PLL_EBB_0_A 0x162034
#define _PORT_PLL_EBB_0_B 0x6C034
#define _PORT_PLL_EBB_0_C 0x6C340
#define PORT_PLL_P1_MASK (0x07 << 13)
#define PORT_PLL_P1(x) ((x) << 13)
#define PORT_PLL_P2_MASK (0x1f << 8)
#define PORT_PLL_P2(x) ((x) << 8)
#define PORT_PLL_P1_SHIFT 13
#define PORT_PLL_P1_MASK (0x07 << PORT_PLL_P1_SHIFT)
#define PORT_PLL_P1(x) ((x) << PORT_PLL_P1_SHIFT)
#define PORT_PLL_P2_SHIFT 8
#define PORT_PLL_P2_MASK (0x1f << PORT_PLL_P2_SHIFT)
#define PORT_PLL_P2(x) ((x) << PORT_PLL_P2_SHIFT)
#define BXT_PORT_PLL_EBB_0(port) _PORT3(port, _PORT_PLL_EBB_0_A, \
_PORT_PLL_EBB_0_B, \
_PORT_PLL_EBB_0_C)
@ -1193,8 +1195,9 @@ enum skl_disp_power_wells {
/* PORT_PLL_0_A */
#define PORT_PLL_M2_MASK 0xFF
/* PORT_PLL_1_A */
#define PORT_PLL_N_MASK (0x0F << 8)
#define PORT_PLL_N(x) ((x) << 8)
#define PORT_PLL_N_SHIFT 8
#define PORT_PLL_N_MASK (0x0F << PORT_PLL_N_SHIFT)
#define PORT_PLL_N(x) ((x) << PORT_PLL_N_SHIFT)
/* PORT_PLL_2_A */
#define PORT_PLL_M2_FRAC_MASK 0x3FFFFF
/* PORT_PLL_3_A */

22
drivers/gpu/drm/i915/intel_ddi.c
View File

@ -1140,8 +1140,26 @@ static void hsw_ddi_clock_get(struct intel_encoder *encoder,
static int bxt_calc_pll_link(struct drm_i915_private *dev_priv,
enum intel_dpll_id dpll)
{
/* FIXME formula not available in bspec */
return 0;
struct intel_shared_dpll *pll;
struct intel_dpll_hw_state *state;
intel_clock_t clock;
/* For DDI ports we always use a shared PLL. */
if (WARN_ON(dpll == DPLL_ID_PRIVATE))
return 0;
pll = &dev_priv->shared_dplls[dpll];
state = &pll->config.hw_state;
clock.m1 = 2;
clock.m2 = (state->pll0 & PORT_PLL_M2_MASK) << 22;
if (state->pll3 & PORT_PLL_M2_FRAC_ENABLE)
clock.m2 |= state->pll2 & PORT_PLL_M2_FRAC_MASK;
clock.n = (state->pll1 & PORT_PLL_N_MASK) >> PORT_PLL_N_SHIFT;
clock.p1 = (state->ebb0 & PORT_PLL_P1_MASK) >> PORT_PLL_P1_SHIFT;
clock.p2 = (state->ebb0 & PORT_PLL_P2_MASK) >> PORT_PLL_P2_SHIFT;
return chv_calc_dpll_params(100000, &clock);
}
static void bxt_ddi_clock_get(struct intel_encoder *encoder,