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Commit 262d67e7 authored by Sandeep Sheriker Mallikarjun's avatar Sandeep Sheriker Mallikarjun Committed by Sam Ravnborg
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drm: atmel-hlcdc: enable sys_clk during initalization. 



For SAM9X60 SoC, sys_clk is through lcd_gclk clock source and this
needs to be enabled before enabling lcd_clk.

Signed-off-by: default avatarSandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun@microchip.com>
[claudiu.beznea@microchip.com: add fixed_clksrc checks]
Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: default avatarSam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1556195748-11106-5-git-send-email-claudiu.beznea@microchip.com
parent e1dc68a4

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c

+18 −1
Original line number Diff line number Diff line
@@ -625,10 +625,18 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev) 
	dc->hlcdc = dev_get_drvdata(dev->dev->parent);

	dev->dev_private = dc;



	if (dc->desc->fixed_clksrc) {

		ret = clk_prepare_enable(dc->hlcdc->sys_clk);

		if (ret) {

			dev_err(dev->dev, "failed to enable sys_clk\n");

			goto err_destroy_wq;

		}

	}



	ret = clk_prepare_enable(dc->hlcdc->periph_clk);

	if (ret) {

		dev_err(dev->dev, "failed to enable periph_clk\n");

		goto err_destroy_wq;

		goto err_sys_clk_disable;

	}



	pm_runtime_enable(dev->dev);
@@ -664,6 +672,9 @@ static int atmel_hlcdc_dc_load(struct drm_device *dev) 
err_periph_clk_disable:

	pm_runtime_disable(dev->dev);

	clk_disable_unprepare(dc->hlcdc->periph_clk);

err_sys_clk_disable:

	if (dc->desc->fixed_clksrc)

		clk_disable_unprepare(dc->hlcdc->sys_clk);



err_destroy_wq:

	destroy_workqueue(dc->wq);
@@ -688,6 +699,8 @@ static void atmel_hlcdc_dc_unload(struct drm_device *dev) 


	pm_runtime_disable(dev->dev);

	clk_disable_unprepare(dc->hlcdc->periph_clk);

	if (dc->desc->fixed_clksrc)

		clk_disable_unprepare(dc->hlcdc->sys_clk);

	destroy_workqueue(dc->wq);

}
@@ -805,6 +818,8 @@ static int atmel_hlcdc_dc_drm_suspend(struct device *dev) 
	regmap_read(regmap, ATMEL_HLCDC_IMR, &dc->suspend.imr);

	regmap_write(regmap, ATMEL_HLCDC_IDR, dc->suspend.imr);

	clk_disable_unprepare(dc->hlcdc->periph_clk);

	if (dc->desc->fixed_clksrc)

		clk_disable_unprepare(dc->hlcdc->sys_clk);



	return 0;

}
@@ -814,6 +829,8 @@ static int atmel_hlcdc_dc_drm_resume(struct device *dev) 
	struct drm_device *drm_dev = dev_get_drvdata(dev);

	struct atmel_hlcdc_dc *dc = drm_dev->dev_private;



	if (dc->desc->fixed_clksrc)

		clk_prepare_enable(dc->hlcdc->sys_clk);

	clk_prepare_enable(dc->hlcdc->periph_clk);

	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER, dc->suspend.imr);