leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/i915/psr: Remove open-coded PSR AUX transactions for SKL+

Browse Source 
HSW and BDW have SRD_AUX_{CTL, STATUS} registers that the driver needs to
setup for the HW to use whenever exiting PSR. SKL+ hardware use hardcoded
values for the same and do not need any registers to be setup. So, use
drm_dp_dpcd_writeb() for a one-time write during PSR enable and setup the
PSR aux registers on HSW and BDW for later use by HW.

We also end up writing to reserved bits in SRD_AUX_CTL by reusing
intel_dp->get_aux_send_ctl() for HSW and BDW, fix this.

Since the AUX register setup is source side programming, move the call
to enable_source() from enable_sink().

Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Jose Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180313034646.3721-2-dhinakaran.pandiyan@intel.com
This commit is contained in:
Dhinakaran Pandiyan 2018-03-12 20:46:46 -07:00 committed by Rodrigo Vivi
parent b90eed08d8
commit d544e918ff
2 changed files with 28 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/i915/i915_reg.h
View File

@ -3846,6 +3846,12 @@ enum {
#define EDP_PSR_IDLE_FRAME_SHIFT 0
#define EDP_PSR_AUX_CTL _MMIO(dev_priv->psr_mmio_base + 0x10)
#define EDP_PSR_AUX_CTL_TIME_OUT_MASK (3 << 26)
#define EDP_PSR_AUX_CTL_MESSAGE_SIZE_MASK (0x1f << 20)
#define EDP_PSR_AUX_CTL_PRECHARGE_2US_MASK (0xf << 16)
#define EDP_PSR_AUX_CTL_ERROR_INTERRUPT (1 << 11)
#define EDP_PSR_AUX_CTL_BIT_CLOCK_2X_MASK (0x7ff)
#define EDP_PSR_AUX_DATA(i) _MMIO(dev_priv->psr_mmio_base + 0x14 + (i) * 4) /* 5 registers */
#define EDP_PSR_STATUS _MMIO(dev_priv->psr_mmio_base + 0x40)

55
drivers/gpu/drm/i915/intel_psr.c
View File

@ -228,31 +228,12 @@ static void vlv_psr_enable_sink(struct intel_dp *intel_dp)
DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
}
static i915_reg_t psr_aux_ctl_reg(struct drm_i915_private *dev_priv,
enum port port)
{
if (INTEL_GEN(dev_priv) >= 9)
return DP_AUX_CH_CTL(port);
else
return EDP_PSR_AUX_CTL;
}
static i915_reg_t psr_aux_data_reg(struct drm_i915_private *dev_priv,
enum port port, int index)
{
if (INTEL_GEN(dev_priv) >= 9)
return DP_AUX_CH_DATA(port, index);
else
return EDP_PSR_AUX_DATA(index);
}
static void hsw_psr_setup_aux(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = dig_port->base.base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
uint32_t aux_clock_divider;
i915_reg_t aux_ctl_reg;
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
u32 aux_clock_divider, aux_ctl;
int i;
static const uint8_t aux_msg[] = {
[0] = DP_AUX_NATIVE_WRITE << 4,
[1] = DP_SET_POWER >> 8,
@ -260,23 +241,25 @@ static void hsw_psr_setup_aux(struct intel_dp *intel_dp)
[3] = 1 - 1,
[4] = DP_SET_POWER_D0,
};
enum port port = dig_port->base.port;
u32 aux_ctl;
int i;
u32 psr_aux_mask = EDP_PSR_AUX_CTL_TIME_OUT_MASK |
EDP_PSR_AUX_CTL_MESSAGE_SIZE_MASK |
EDP_PSR_AUX_CTL_PRECHARGE_2US_MASK |
EDP_PSR_AUX_CTL_BIT_CLOCK_2X_MASK;
BUILD_BUG_ON(sizeof(aux_msg) > 20);
aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
aux_ctl_reg = psr_aux_ctl_reg(dev_priv, port);
/* Setup AUX registers */
for (i = 0; i < sizeof(aux_msg); i += 4)
I915_WRITE(psr_aux_data_reg(dev_priv, port, i >> 2),
I915_WRITE(EDP_PSR_AUX_DATA(i >> 2),
intel_dp_pack_aux(&aux_msg[i], sizeof(aux_msg) - i));
aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
/* Start with bits set for DDI_AUX_CTL register */
aux_ctl = intel_dp->get_aux_send_ctl(intel_dp, 0, sizeof(aux_msg),
aux_clock_divider);
I915_WRITE(aux_ctl_reg, aux_ctl);
/* Select only valid bits for SRD_AUX_CTL */
aux_ctl &= psr_aux_mask;
I915_WRITE(EDP_PSR_AUX_CTL, aux_ctl);
}
static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
@ -303,7 +286,7 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
DP_PSR_ENABLE);
hsw_psr_setup_aux(intel_dp);
drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
}
static void vlv_psr_enable_source(struct intel_dp *intel_dp,
@ -599,6 +582,12 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp,
psr_aux_io_power_get(intel_dp);
/* Only HSW and BDW have PSR AUX registers that need to be setup. SKL+
* use hardcoded values PSR AUX transactions
*/
if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
hsw_psr_setup_aux(intel_dp);
if (dev_priv->psr.psr2_support) {
chicken = PSR2_VSC_ENABLE_PROG_HEADER;
if (dev_priv->psr.y_cord_support)