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kernel_samsung_sm7125/drivers/gpu/drm/i915/intel_lspcon.c

248 lines
6.8 KiB

/*
* Copyright © 2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*
*/
#include <drm/drm_edid.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_dp_dual_mode_helper.h>
#include "intel_drv.h"
static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
{
struct intel_digital_port *dig_port =
container_of(lspcon, struct intel_digital_port, lspcon);
return &dig_port->dp;
}
static const char *lspcon_mode_name(enum drm_lspcon_mode mode)
{
switch (mode) {
case DRM_LSPCON_MODE_PCON:
return "PCON";
case DRM_LSPCON_MODE_LS:
return "LS";
case DRM_LSPCON_MODE_INVALID:
return "INVALID";
default:
MISSING_CASE(mode);
return "INVALID";
}
}
static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
{
enum drm_lspcon_mode current_mode;
struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
if (drm_lspcon_get_mode(adapter, &current_mode)) {
DRM_ERROR("Error reading LSPCON mode\n");
return DRM_LSPCON_MODE_INVALID;
}
return current_mode;
}
static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon,
enum drm_lspcon_mode mode)
{
enum drm_lspcon_mode current_mode;
current_mode = lspcon_get_current_mode(lspcon);
if (current_mode == mode || current_mode == DRM_LSPCON_MODE_INVALID)
goto out;
DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n",
lspcon_mode_name(mode));
wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode ||
drm/i915: Increase LSPCON timeout commit 299c2a904b1e8d5096d4813df6371357d97a6cd1 upstream. 100 ms is not enough time for the LSPCON adapter on Intel NUC devices to settle. This causes dropped display modes at boot or screen reconfiguration. Empirical testing can reproduce the error up to a timeout of 190 ms. Basic boot and stress testing at 200 ms has not (yet) failed. Increase timeout to 400 ms to get some margin of error. Changes from v1: The initial suggestion of 1000 ms was lowered due to concerns about delaying valid timeout cases. Update patch metadata. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107503 Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1570392 Fixes: 357c0ae9198a ("drm/i915/lspcon: Wait for expected LSPCON mode to settle") Cc: Shashank Sharma <shashank.sharma@intel.com> Cc: Imre Deak <imre.deak@intel.com> Cc: Jani Nikula <jani.nikula@intel.com> Cc: <stable@vger.kernel.org> # v4.11+ Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: Shashank Sharma <shashank.sharma@intel.com> Signed-off-by: Fredrik Schön <fredrik.schon@gmail.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180817200728.8154-1-fredrik.schon@gmail.com (cherry picked from commit 59f1c8ab30d6f9042562949f42cbd3f3cf69de94) Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: Shashank Sharma <shashank.sharma@intel.com> Signed-off-by: Fredrik Schön <fredrik.schon@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
6 years ago
current_mode == DRM_LSPCON_MODE_INVALID, 400);
if (current_mode != mode)
DRM_DEBUG_KMS("LSPCON mode hasn't settled\n");
out:
DRM_DEBUG_KMS("Current LSPCON mode %s\n",
lspcon_mode_name(current_mode));
return current_mode;
}
static int lspcon_change_mode(struct intel_lspcon *lspcon,
enum drm_lspcon_mode mode)
{
int err;
enum drm_lspcon_mode current_mode;
struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
err = drm_lspcon_get_mode(adapter, &current_mode);
if (err) {
DRM_ERROR("Error reading LSPCON mode\n");
return err;
}
if (current_mode == mode) {
DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n");
return 0;
}
err = drm_lspcon_set_mode(adapter, mode);
if (err < 0) {
DRM_ERROR("LSPCON mode change failed\n");
return err;
}
lspcon->mode = mode;
DRM_DEBUG_KMS("LSPCON mode changed done\n");
return 0;
}
static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon)
{
uint8_t rev;
if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV,
&rev) != 1) {
DRM_DEBUG_KMS("Native AUX CH down\n");
return false;
}
DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n",
rev >> 4, rev & 0xf);
return true;
}
static bool lspcon_probe(struct intel_lspcon *lspcon)
{
enum drm_dp_dual_mode_type adaptor_type;
struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc;
enum drm_lspcon_mode expected_mode;
expected_mode = lspcon_wake_native_aux_ch(lspcon) ?
DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS;
/* Lets probe the adaptor and check its type */
adaptor_type = drm_dp_dual_mode_detect(adapter);
if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) {
DRM_DEBUG_KMS("No LSPCON detected, found %s\n",
drm_dp_get_dual_mode_type_name(adaptor_type));
return false;
}
/* Yay ... got a LSPCON device */
DRM_DEBUG_KMS("LSPCON detected\n");
lspcon->mode = lspcon_wait_mode(lspcon, expected_mode);
lspcon->active = true;
return true;
}
static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
{
struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
unsigned long start = jiffies;
while (1) {
if (intel_digital_port_connected(dev_priv, dig_port)) {
DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %u ms\n",
jiffies_to_msecs(jiffies - start));
return;
}
if (time_after(jiffies, start + msecs_to_jiffies(1000)))
break;
usleep_range(10000, 15000);
}
DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n");
}
void lspcon_resume(struct intel_lspcon *lspcon)
{
enum drm_lspcon_mode expected_mode;
if (lspcon_wake_native_aux_ch(lspcon)) {
expected_mode = DRM_LSPCON_MODE_PCON;
lspcon_resume_in_pcon_wa(lspcon);
} else {
expected_mode = DRM_LSPCON_MODE_LS;
}
if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON)
return;
if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON))
DRM_ERROR("LSPCON resume failed\n");
else
DRM_DEBUG_KMS("LSPCON resume success\n");
}
void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon)
{
lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON);
}
bool lspcon_init(struct intel_digital_port *intel_dig_port)
{
struct intel_dp *dp = &intel_dig_port->dp;
struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
if (!HAS_LSPCON(dev_priv)) {
DRM_ERROR("LSPCON is not supported on this platform\n");
return false;
}
lspcon->active = false;
lspcon->mode = DRM_LSPCON_MODE_INVALID;
if (!lspcon_probe(lspcon)) {
DRM_ERROR("Failed to probe lspcon\n");
return false;
}
/*
* In the SW state machine, lets Put LSPCON in PCON mode only.
* In this way, it will work with both HDMI 1.4 sinks as well as HDMI
* 2.0 sinks.
*/
if (lspcon->active && lspcon->mode != DRM_LSPCON_MODE_PCON) {
if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON) < 0) {
DRM_ERROR("LSPCON mode change to PCON failed\n");
return false;
}
}
if (!intel_dp_read_dpcd(dp)) {
DRM_ERROR("LSPCON DPCD read failed\n");
return false;
}
drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd));
DRM_DEBUG_KMS("Success: LSPCON init\n");
return true;
}