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drm/exynos: fimd: fix window clear code 

To correctly disable hardware window during driver init, both enable bits
(WINCONx_ENWIN in WINCON and SHADOWCON_CHx_ENABLE in SHADOWCON) must be
cleared, otherwise hardware fails to re-enable such window later.

While touching this function, also temporarily disable ctx->suspended flag
to let fimd_wait_for_vblank function really to do its job.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Marek Szyprowski 2014-09-01 22:27:10 +09:00 committed by Inki Dae
parent 71b1f1956b
commit eb8a3bf73e
1 changed files with 19 additions and 6 deletions
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25
drivers/gpu/drm/exynos/exynos_drm_fimd.c
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@ -214,7 +214,6 @@ static void fimd_wait_for_vblank(struct exynos_drm_manager *mgr)
DRM_DEBUG_KMS("vblank wait timed out.\n");
}
static void fimd_clear_channel(struct exynos_drm_manager *mgr)
{
struct fimd_context *ctx = mgr->ctx;
@ -224,17 +223,31 @@ static void fimd_clear_channel(struct exynos_drm_manager *mgr)
/* Check if any channel is enabled. */
for (win = 0; win < WINDOWS_NR; win++) {
u32 val = readl(ctx->regs + SHADOWCON);
if (val & SHADOWCON_CHx_ENABLE(win)) {
val &= ~SHADOWCON_CHx_ENABLE(win);
writel(val, ctx->regs + SHADOWCON);
u32 val = readl(ctx->regs + WINCON(win));
if (val & WINCONx_ENWIN) {
/* wincon */
val &= ~WINCONx_ENWIN;
writel(val, ctx->regs + WINCON(win));
/* unprotect windows */
if (ctx->driver_data->has_shadowcon) {
val = readl(ctx->regs + SHADOWCON);
val &= ~SHADOWCON_CHx_ENABLE(win);
writel(val, ctx->regs + SHADOWCON);
}
ch_enabled = 1;
}
}
/* Wait for vsync, as disable channel takes effect at next vsync */
if (ch_enabled)
if (ch_enabled) {
unsigned int state = ctx->suspended;
ctx->suspended = 0;
fimd_wait_for_vblank(mgr);
ctx->suspended = state;
}
}
static int fimd_mgr_initialize(struct exynos_drm_manager *mgr,