Commit 97f90e1b authored by Georgi Djakov's avatar Georgi Djakov Committed by Rob Clark
Browse files

drm/msm/mdp5: Use the interconnect API 



The interconnect API provides an interface for consumer drivers to
express their bandwidth needs in the SoC. This data is aggregated
and the on-chip interconnect hardware is configured to the most
appropriate power/performance profile.

Use the API to configure the interconnects and request bandwidth
between DDR and the display hardware (MDP port(s) and rotator
downscaler).

v2: update the path names to be consistent with dpu, handle the NULL
    path case, updated commit msg from Georgi.
v3: split out icc setup into it's own function, and rework logic
    slightly so no interconnect paths is not fatal.

Signed-off-by: default avatarGeorgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
Reviewed-By: default avatarJeffrey Hugo <jeffrey.l.hugo@gmail.com>
parent 217a6ddf

drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c

+38 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
 * this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#include <linux/interconnect.h>

#include <linux/of_irq.h>



#include "msm_drv.h"
@@ -1048,9 +1049,46 @@ static const struct component_ops mdp5_ops = { 
	.unbind = mdp5_unbind,

};



static int mdp5_setup_interconnect(struct platform_device *pdev)

{

	struct icc_path *path0 = of_icc_get(&pdev->dev, "mdp0-mem");

	struct icc_path *path1 = of_icc_get(&pdev->dev, "mdp1-mem");

	struct icc_path *path_rot = of_icc_get(&pdev->dev, "rotator-mem");



	if (IS_ERR(path0))

		return PTR_ERR(path0);



	if (!path0) {

		/* no interconnect support is not necessarily a fatal

		 * condition, the platform may simply not have an

		 * interconnect driver yet.  But warn about it in case

		 * bootloader didn't setup bus clocks high enough for

		 * scanout.

		 */

		dev_warn(&pdev->dev, "No interconnect support may cause display underflows!\n");

		return 0;

	}



	icc_set_bw(path0, 0, MBps_to_icc(6400));



	if (!IS_ERR_OR_NULL(path1))

		icc_set_bw(path1, 0, MBps_to_icc(6400));

	if (!IS_ERR_OR_NULL(path_rot))

		icc_set_bw(path_rot, 0, MBps_to_icc(6400));



	return 0;

}



static int mdp5_dev_probe(struct platform_device *pdev)

{

	int ret;



	DBG("");



	ret = mdp5_setup_interconnect(pdev);

	if (ret)

		return ret;



	return component_add(&pdev->dev, &mdp5_ops);

}

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