mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-03 19:26:01 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915/dg2: Don't wait for AUX power well enable ACKs

Browse Source 
On DG2 we're supposed to just wait 600us after programming the well
before moving on; there won't be an ack from the hardware.

Bspec: 49296
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210721223043.834562-14-matthew.d.roper@intel.com
This commit is contained in:
Matt Roper
2021-07-21 15:30:38 -07:00
parent 87fc875a2b
commit 48f8f016d4
2 changed files with 22 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpu/drm/i915/display/intel_display_power.c
View File

@@ -341,6 +341,17 @@ static void hsw_wait_for_power_well_enable(struct drm_i915_private *dev_priv,
{
const struct i915_power_well_regs *regs = power_well->desc->hsw.regs;
int pw_idx = power_well->desc->hsw.idx;
int enable_delay = power_well->desc->hsw.fixed_enable_delay;
/*
* For some power wells we're not supposed to watch the status bit for
* an ack, but rather just wait a fixed amount of time and then
* proceed. This is only used on DG2.
*/
if (IS_DG2(dev_priv) && enable_delay) {
usleep_range(enable_delay, 2 * enable_delay);
return;
}
/* Timeout for PW1:10 us, AUX:not specified, other PWs:20 us. */
if (intel_de_wait_for_set(dev_priv, regs->driver,
@@ -4828,6 +4839,7 @@ static const struct i915_power_well_desc xelpd_power_wells[] = {
{
.hsw.regs = &icl_aux_power_well_regs,
.hsw.idx = ICL_PW_CTL_IDX_AUX_A,
.hsw.fixed_enable_delay = 600,
},
},
{
@@ -4838,6 +4850,7 @@ static const struct i915_power_well_desc xelpd_power_wells[] = {
{
.hsw.regs = &icl_aux_power_well_regs,
.hsw.idx = ICL_PW_CTL_IDX_AUX_B,
.hsw.fixed_enable_delay = 600,
},
},
{
@@ -4848,6 +4861,7 @@ static const struct i915_power_well_desc xelpd_power_wells[] = {
{
.hsw.regs = &icl_aux_power_well_regs,
.hsw.idx = ICL_PW_CTL_IDX_AUX_C,
.hsw.fixed_enable_delay = 600,
},
},
{
@@ -4858,6 +4872,7 @@ static const struct i915_power_well_desc xelpd_power_wells[] = {
{
.hsw.regs = &icl_aux_power_well_regs,
.hsw.idx = XELPD_PW_CTL_IDX_AUX_D,
.hsw.fixed_enable_delay = 600,
},
},
{
@@ -4878,6 +4893,7 @@ static const struct i915_power_well_desc xelpd_power_wells[] = {
{
.hsw.regs = &icl_aux_power_well_regs,
.hsw.idx = TGL_PW_CTL_IDX_AUX_TC1,
.hsw.fixed_enable_delay = 600,
},
},
{

6
drivers/gpu/drm/i915/display/intel_display_power.h
View File

@@ -223,6 +223,12 @@ struct i915_power_well_desc {
u8 idx;
/* Mask of pipes whose IRQ logic is backed by the pw */
u8 irq_pipe_mask;
/*
* Instead of waiting for the status bit to ack enables,
* just wait a specific amount of time and then consider
* the well enabled.
*/
u16 fixed_enable_delay;
/* The pw is backing the VGA functionality */
bool has_vga:1;
bool has_fuses:1;