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Commit 4144ff0c authored by Rahul Sharma's avatar Rahul Sharma Committed by Gerrit - the friendly Code Review server
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drm: msm: sde: kernel needs to monitor bootloader's flush done 



Once kernel sends splash stop signal to bootloader, it
needs to listen to bootloader's cocurrent flush to
hardware is done, otherwise, one race condition issue
for mixer clear and setup messed may happen.

Change-Id: I7b603b9acc0dd0af07da3c5afee052007432b7fb
Signed-off-by: default avatarGuchun Chen <guchunc@codeaurora.org>
Signed-off-by: default avatarRahul Sharma <rahsha@codeaurora.org>
parent 361feeef

drivers/gpu/drm/msm/sde/sde_splash.c

+30 −0
Original line number Diff line number Diff line
@@ -40,6 +40,8 @@ 
#define SDE_LK_RUNNING_VALUE		0xC001CAFE

#define SDE_LK_STOP_SPLASH_VALUE	0xDEADDEAD

#define SDE_LK_EXIT_VALUE		0xDEADBEEF

#define SDE_LK_INTERMEDIATE_STOP	0xBEEFBEEF

#define SDE_LK_KERNEL_SPLASH_TALK_LOOP	20



#define INTF_HDMI_SEL                  (BIT(25) | BIT(24))

#define INTF_DSI0_SEL                  BIT(8)
@@ -152,7 +154,35 @@ static bool _sde_splash_lk_check(void) 
 */

static inline void _sde_splash_notify_lk_stop_splash(void)

{

	int i = 0;

	int32_t *scratch_pad = NULL;



	/* request Lk to stop splash */

	request_early_service_shutdown(EARLY_DISPLAY);



	/*

	 * Before next proceeding, kernel needs to check bootloader's

	 * intermediate status to ensure LK's concurrent flush is done.

	 */

	while (i++ < SDE_LK_KERNEL_SPLASH_TALK_LOOP) {



		scratch_pad =

			(int32_t *)get_service_shared_mem_start(EARLY_DISPLAY);



		if (scratch_pad) {

			if ((*scratch_pad != SDE_LK_INTERMEDIATE_STOP) &&

				(_sde_splash_lk_check())) {

				DRM_INFO("wait for LK's intermediate ack\n");

				msleep(20);

			} else {

				SDE_DEBUG("received LK intermediate ack\n");

				break;

			}

		}

	}



	if (i == SDE_LK_KERNEL_SPLASH_TALK_LOOP)

		SDE_ERROR("Loop talk for LK and Kernel failed\n");

}



static int _sde_splash_gem_new(struct drm_device *dev,