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drm/lima: Add optional devfreq and cooling device support

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Most platforms with a Mali-400 or Mali-450 GPU also have support for
changing the GPU clock frequency. Add devfreq support so the GPU clock
rate is updated based on the actual GPU usage when the
"operating-points-v2" property is present in the board.dts.

The actual devfreq code is taken from panfrost_devfreq.c and modified so
it matches what the lima hardware needs:
- a call to dev_pm_opp_set_clkname() during initialization because there
  are two clocks on Mali-4x0 IPs. "core" is the one that actually clocks
  the GPU so we need to control it using devfreq.
- locking when reading or writing the devfreq statistics because (unlike
  than panfrost) we have multiple PP and GP IRQs which may finish jobs
  concurrently.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200319203427.2259891-3-martin.blumenstingl@googlemail.com
This commit is contained in:
Martin Blumenstingl
2020-03-19 21:34:27 +01:00
committed by Qiang Yu
parent 6bb0942e8f
commit 1996970773
9 changed files with 308 additions and 3 deletions
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14
drivers/gpu/drm/lima/lima_drv.c
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@@ -10,6 +10,7 @@
#include <drm/drm_prime.h>
#include <drm/lima_drm.h>
#include "lima_device.h"
#include "lima_drv.h"
#include "lima_gem.h"
#include "lima_vm.h"
@@ -397,13 +398,19 @@ static int lima_pdev_probe(struct platform_device *pdev)
if (err)
goto err_out1;
err = lima_devfreq_init(ldev);
if (err) {
dev_err(&pdev->dev, "Fatal error during devfreq init\n");
goto err_out2;
}
/*
* Register the DRM device with the core and the connectors with
* sysfs.
*/
err = drm_dev_register(ddev, 0);
if (err < 0)
goto err_out2;
goto err_out3;
platform_set_drvdata(pdev, ldev);
@@ -412,8 +419,10 @@ static int lima_pdev_probe(struct platform_device *pdev)
return 0;
err_out2:
err_out3:
lima_device_fini(ldev);
err_out2:
lima_devfreq_fini(ldev);
err_out1:
drm_dev_put(ddev);
err_out0:
@@ -429,6 +438,7 @@ static int lima_pdev_remove(struct platform_device *pdev)
sysfs_remove_bin_file(&ldev->dev->kobj, &lima_error_state_attr);
platform_set_drvdata(pdev, NULL);
drm_dev_unregister(ddev);
lima_devfreq_fini(ldev);
lima_device_fini(ldev);
drm_dev_put(ddev);
lima_sched_slab_fini();