drm/i915: Don't use link_bw for PLL setup

Use port_clock instead of link_bw when picking the PLL parameters for
DP. link_bw may be zero with an eDP 1.4 sink that supports
DP_LINK_RATE_SET so we shouldn't use it for anything other than feed it
to the sink appropriately.

v2: Fix typo in commit message (Sivakumar)

Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[Jani: cherry-picked from future.]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 1900455..61575f6 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1554,17 +1554,14 @@ skl_ddi_pll_select(struct intel_crtc *intel_crtc,
                         DPLL_CFGCR2_PDIV(wrpll_params.pdiv) |
                         wrpll_params.central_freq;
        } else if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT) {
-               struct drm_encoder *encoder = &intel_encoder->base;
-               struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
-
-               switch (intel_dp->link_bw) {
-               case DP_LINK_BW_1_62:
+               switch (crtc_state->port_clock / 2) {
+               case 81000:
                        ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, 0);
                        break;
-               case DP_LINK_BW_2_7:
+               case 135000:
                        ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1350, 0);
                        break;
-               case DP_LINK_BW_5_4:
+               case 270000:
                        ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_2700, 0);
                        break;
                }

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 32663b1..ef345d5 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -48,28 +48,28 @@
 #define INTEL_DP_RESOLUTION_FAILSAFE   (3 << INTEL_DP_RESOLUTION_SHIFT_MASK)
 
 struct dp_link_dpll {
-       int link_bw;
+       int clock;
        struct dpll dpll;
 };
 
 static const struct dp_link_dpll gen4_dpll[] = {
-       { DP_LINK_BW_1_62,
+       { 162000,
                { .p1 = 2, .p2 = 10, .n = 2, .m1 = 23, .m2 = 8 } },
-       { DP_LINK_BW_2_7,
+       { 270000,
                { .p1 = 1, .p2 = 10, .n = 1, .m1 = 14, .m2 = 2 } }
 };
 
 static const struct dp_link_dpll pch_dpll[] = {
-       { DP_LINK_BW_1_62,
+       { 162000,
                { .p1 = 2, .p2 = 10, .n = 1, .m1 = 12, .m2 = 9 } },
-       { DP_LINK_BW_2_7,
+       { 270000,
                { .p1 = 1, .p2 = 10, .n = 2, .m1 = 14, .m2 = 8 } }
 };
 
 static const struct dp_link_dpll vlv_dpll[] = {
-       { DP_LINK_BW_1_62,
+       { 162000,
                { .p1 = 3, .p2 = 2, .n = 5, .m1 = 3, .m2 = 81 } },
-       { DP_LINK_BW_2_7,
+       { 270000,
                { .p1 = 2, .p2 = 2, .n = 1, .m1 = 2, .m2 = 27 } }
 };
 
@@ -83,11 +83,11 @@ static const struct dp_link_dpll chv_dpll[] = {
         * m2 is stored in fixed point format using formula below
         * (m2_int << 22) | m2_fraction
         */
-       { DP_LINK_BW_1_62,      /* m2_int = 32, m2_fraction = 1677722 */
+       { 162000,       /* m2_int = 32, m2_fraction = 1677722 */
                { .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } },
-       { DP_LINK_BW_2_7,       /* m2_int = 27, m2_fraction = 0 */
+       { 270000,       /* m2_int = 27, m2_fraction = 0 */
                { .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },
-       { DP_LINK_BW_5_4,       /* m2_int = 27, m2_fraction = 0 */
+       { 540000,       /* m2_int = 27, m2_fraction = 0 */
                { .p1 = 2, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } }
 };
 
@@ -1130,7 +1130,7 @@ intel_dp_connector_unregister(struct intel_connector *intel_connector)
 }
 
 static void
-skl_edp_set_pll_config(struct intel_crtc_state *pipe_config, int link_clock)
+skl_edp_set_pll_config(struct intel_crtc_state *pipe_config)
 {
        u32 ctrl1;
 
@@ -1142,7 +1142,7 @@ skl_edp_set_pll_config(struct intel_crtc_state *pipe_config, int link_clock)
        pipe_config->dpll_hw_state.cfgcr2 = 0;
 
        ctrl1 = DPLL_CTRL1_OVERRIDE(SKL_DPLL0);
-       switch (link_clock / 2) {
+       switch (pipe_config->port_clock / 2) {
        case 81000:
                ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810,
                                              SKL_DPLL0);
@@ -1176,19 +1176,19 @@ 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)
+hsw_dp_set_ddi_pll_sel(struct intel_crtc_state *pipe_config)
 {
        memset(&pipe_config->dpll_hw_state, 0,
               sizeof(pipe_config->dpll_hw_state));
 
-       switch (link_bw) {
-       case DP_LINK_BW_1_62:
+       switch (pipe_config->port_clock / 2) {
+       case 81000:
                pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_810;
                break;
-       case DP_LINK_BW_2_7:
+       case 135000:
                pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350;
                break;
-       case DP_LINK_BW_5_4:
+       case 270000:
                pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700;
                break;
        }
@@ -1245,7 +1245,7 @@ intel_dp_source_rates(struct drm_device *dev, const int **source_rates)
 
 static void
 intel_dp_set_clock(struct intel_encoder *encoder,
-                  struct intel_crtc_state *pipe_config, int link_bw)
+                  struct intel_crtc_state *pipe_config)
 {
        struct drm_device *dev = encoder->base.dev;
        const struct dp_link_dpll *divisor = NULL;
@@ -1267,7 +1267,7 @@ intel_dp_set_clock(struct intel_encoder *encoder,
 
        if (divisor && count) {
                for (i = 0; i < count; i++) {
-                       if (link_bw == divisor[i].link_bw) {
+                       if (pipe_config->port_clock == divisor[i].clock) {
                                pipe_config->dpll = divisor[i].dpll;
                                pipe_config->clock_set = true;
                                break;
@@ -1544,13 +1544,13 @@ found:
        }
 
        if (IS_SKYLAKE(dev) && is_edp(intel_dp))
-               skl_edp_set_pll_config(pipe_config, common_rates[clock]);
+               skl_edp_set_pll_config(pipe_config);
        else if (IS_BROXTON(dev))
                /* handled in ddi */;
        else if (IS_HASWELL(dev) || IS_BROADWELL(dev))
-               hsw_dp_set_ddi_pll_sel(pipe_config, intel_dp->link_bw);
+               hsw_dp_set_ddi_pll_sel(pipe_config);
        else
-               intel_dp_set_clock(encoder, pipe_config, intel_dp->link_bw);
+               intel_dp_set_clock(encoder, pipe_config);
 
        return true;
 }