On 17/06/2022 23:47, Stephen Boyd wrote:
This struct member is stored to in the function that calls the function
which uses it. That's possible with a function argument instead of
storing to a struct member. Pass the pixel_rate as an argument instead
to simplify the code. Note that dp_ctrl_link_maintenance() was storing
the pixel_rate but never using it so we just remove the assignment from
there.
Cc: Kuogee Hsieh <quic_khs...@quicinc.com>
Signed-off-by: Stephen Boyd <swb...@chromium.org>
---
drivers/gpu/drm/msm/dp/dp_ctrl.c | 57 ++++++++++++++++----------------
drivers/gpu/drm/msm/dp/dp_ctrl.h | 1 -
2 files changed, 28 insertions(+), 30 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index bd445e683cfc..e114521af2e9 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -1336,7 +1336,7 @@ static void dp_ctrl_set_clock_rate(struct dp_ctrl_private
*ctrl,
name, rate);
}
-static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl)
+static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl,
unsigned long pixel_rate)
I think we can read pixel_rate here rather than getting it as an
argument. We'd need to move handling (DP_TEST_LINK_PHY_TEST_PATTERN &&
!ctrl->panel->dp_mode.drm_mode.clock) case here from dp_ctrl_on_link().
{
int ret = 0;
struct dp_io *dp_io = &ctrl->parser->io;
@@ -1357,25 +1357,25 @@ static int dp_ctrl_enable_mainlink_clocks(struct
dp_ctrl_private *ctrl)
if (ret)
DRM_ERROR("Unable to start link clocks. ret=%d\n", ret);
- drm_dbg_dp(ctrl->drm_dev, "link rate=%d pixel_clk=%d\n",
- ctrl->link->link_params.rate, ctrl->dp_ctrl.pixel_rate);
+ drm_dbg_dp(ctrl->drm_dev, "link rate=%d pixel_clk=%lu\n",
+ ctrl->link->link_params.rate, pixel_rate);
return ret;
}
-static int dp_ctrl_enable_stream_clocks(struct dp_ctrl_private *ctrl)
+static int dp_ctrl_enable_stream_clocks(struct dp_ctrl_private *ctrl,
+ unsigned long pixel_rate)
{
- int ret = 0;
+ int ret;
- dp_ctrl_set_clock_rate(ctrl, DP_STREAM_PM, "stream_pixel",
- ctrl->dp_ctrl.pixel_rate * 1000);
+ dp_ctrl_set_clock_rate(ctrl, DP_STREAM_PM, "stream_pixel", pixel_rate *
1000);
Note to myself (or to anybody doing further cleanup): store stream_pixel
clock into dp_ctrl_private and set it directly here. Then
dp_ctrl_set_clock_rate() can be removed.
ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, true);
if (ret)
DRM_ERROR("Unabled to start pixel clocks. ret=%d\n", ret);
- drm_dbg_dp(ctrl->drm_dev, "link rate=%d pixel_clk=%d\n",
- ctrl->link->link_params.rate, ctrl->dp_ctrl.pixel_rate);
+ drm_dbg_dp(ctrl->drm_dev, "link rate=%d pixel_clk=%lu\n",
+ ctrl->link->link_params.rate, pixel_rate);
return ret;
}
@@ -1445,7 +1445,7 @@ static bool dp_ctrl_use_fixed_nvid(struct dp_ctrl_private
*ctrl)
return false;
}
-static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl)
+static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl,
unsigned long pixel_rate)
{
int ret = 0;
struct dp_io *dp_io = &ctrl->parser->io;
@@ -1469,7 +1469,7 @@ static int dp_ctrl_reinitialize_mainlink(struct
dp_ctrl_private *ctrl)
/* hw recommended delay before re-enabling clocks */
msleep(20);
- ret = dp_ctrl_enable_mainlink_clocks(ctrl);
+ ret = dp_ctrl_enable_mainlink_clocks(ctrl, pixel_rate);
if (ret) {
DRM_ERROR("Failed to enable mainlink clks. ret=%d\n", ret);
return ret;
@@ -1517,8 +1517,6 @@ static int dp_ctrl_link_maintenance(struct
dp_ctrl_private *ctrl)
ctrl->link->phy_params.p_level = 0;
ctrl->link->phy_params.v_level = 0;
- ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
-
ret = dp_ctrl_setup_main_link(ctrl, &training_step);
if (ret)
goto end;
@@ -1588,12 +1586,12 @@ static int dp_ctrl_on_stream_phy_test_report(struct
dp_ctrl *dp_ctrl)
{
int ret;
struct dp_ctrl_private *ctrl;
+ unsigned long pixel_rate;
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
- ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
-
- ret = dp_ctrl_enable_stream_clocks(ctrl);
+ pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
+ ret = dp_ctrl_enable_stream_clocks(ctrl, pixel_rate);
I think we can take another step forward here. Read the
ctrl->panel->dp_mode.drm_mode.clock from within the
dp_ctrl_enable_stream_clocks() function. This removes the need to pass
pixel_rate as an argument here.
if (ret) {
DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
return ret;
@@ -1709,6 +1707,7 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl)
u32 const phy_cts_pixel_clk_khz = 148500;
u8 link_status[DP_LINK_STATUS_SIZE];
unsigned int training_step;
+ unsigned long pixel_rate;
if (!dp_ctrl)
return -EINVAL;
@@ -1723,25 +1722,25 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl)
drm_dbg_dp(ctrl->drm_dev,
"using phy test link parameters\n");
if (!ctrl->panel->dp_mode.drm_mode.clock)
- ctrl->dp_ctrl.pixel_rate = phy_cts_pixel_clk_khz;
+ pixel_rate = phy_cts_pixel_clk_khz;
} else {
ctrl->link->link_params.rate = rate;
ctrl->link->link_params.num_lanes =
ctrl->panel->link_info.num_lanes;
- ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
+ pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
}
- drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%d\n",
+ drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%lu\n",
ctrl->link->link_params.rate, ctrl->link->link_params.num_lanes,
- ctrl->dp_ctrl.pixel_rate);
+ pixel_rate);
- rc = dp_ctrl_enable_mainlink_clocks(ctrl);
+ rc = dp_ctrl_enable_mainlink_clocks(ctrl, pixel_rate);
if (rc)
return rc;
while (--link_train_max_retries) {
- rc = dp_ctrl_reinitialize_mainlink(ctrl);
+ rc = dp_ctrl_reinitialize_mainlink(ctrl, pixel_rate);
if (rc) {
DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n",
rc);
@@ -1836,6 +1835,7 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl, bool
force_link_train)
int ret = 0;
bool mainlink_ready = false;
struct dp_ctrl_private *ctrl;
+ unsigned long pixel_rate;
unsigned long pixel_rate_orig;
if (!dp_ctrl)
@@ -1843,25 +1843,24 @@ int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl, bool
force_link_train)
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
- ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
+ pixel_rate = pixel_rate_orig = ctrl->panel->dp_mode.drm_mode.clock;
- pixel_rate_orig = ctrl->dp_ctrl.pixel_rate;
if (dp_ctrl->wide_bus_en)
- ctrl->dp_ctrl.pixel_rate >>= 1;
+ pixel_rate >>= 1;
- drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%d\n",
+ drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%lu\n",
ctrl->link->link_params.rate,
- ctrl->link->link_params.num_lanes, ctrl->dp_ctrl.pixel_rate);
+ ctrl->link->link_params.num_lanes, pixel_rate);
if (!dp_power_clk_status(ctrl->power, DP_CTRL_PM)) { /* link clk is off */
- ret = dp_ctrl_enable_mainlink_clocks(ctrl);
+ ret = dp_ctrl_enable_mainlink_clocks(ctrl, pixel_rate);
if (ret) {
DRM_ERROR("Failed to start link clocks. ret=%d\n", ret);
goto end;
}
}
- ret = dp_ctrl_enable_stream_clocks(ctrl);
+ ret = dp_ctrl_enable_stream_clocks(ctrl, pixel_rate);
if (ret) {
DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
goto end;
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
index b563e2e3bfe5..9f29734af81c 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
@@ -16,7 +16,6 @@
struct dp_ctrl {
bool orientation;
atomic_t aborted;
- u32 pixel_rate;
bool wide_bus_en;
};
--
With best wishes
Dmitry
