[PATCH v2 2/7] drm/i915: Don't use link_bw for PLL setup

ville.syrjala
2015-08-11T17:27:28Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

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>
---
drivers/gpu/drm/i915/intel_ddi.c | 11 ++++------
drivers/gpu/drm/i915/intel_dp.c | 44 ++++++++++++++++++++--------------------
2 files changed, 26 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 110d546..b183a3d 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1574,17 +1574,14 @@ 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 fe5f4a2..3027c36 100644
--- 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 } }
};

@@ -1133,7 +1133,7 @@ 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;

@@ -1145,7 +1145,7 @@ 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);
@@ -1179,19 +1179,19 @@ 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;
}
@@ -1238,7 +1238,7 @@ 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;
@@ -1260,7 +1260,7 @@ 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;
@@ -1535,13 +1535,13 @@ 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;
}
--
2.4.6