The patch below does not apply to the 5.8-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 244d012801dae30c91983b360457c78d481584b0 Mon Sep 17 00:00:00 2001
From: Thomas Zimmermann tzimmermann@suse.de Date: Thu, 16 Jul 2020 14:53:52 +0200 Subject: [PATCH] drm/ast: Initialize DRAM type before posting GPU
Posting the GPU requires the correct DRAM type to be stored in struct ast_private. Therefore first initialize the DRAM info and then post the GPU. This restores the original order of instructions in this function.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Sam Ravnborg sam@ravnborg.org Acked-by: Benjamin Herrenschmidt benh@kernel.crashing.org Fixes: bad09da6deab ("drm/ast: Fixed vram size incorrect issue on POWER") Cc: Joel Stanley joel@jms.id.au Cc: Y.C. Chen yc_chen@aspeedtech.com Cc: Benjamin Herrenschmidt benh@kernel.crashing.org Cc: Dave Airlie airlied@redhat.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Gerd Hoffmann kraxel@redhat.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Sam Ravnborg sam@ravnborg.org Cc: Emil Velikov emil.l.velikov@gmail.com Cc: "Y.C. Chen" yc_chen@aspeedtech.com Cc: stable@vger.kernel.org # v4.11+ Link: https://patchwork.freedesktop.org/patch/msgid/20200716125353.31512-6-tzimmer...
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c index b162cc82204d..87e5baded2a7 100644 --- a/drivers/gpu/drm/ast/ast_main.c +++ b/drivers/gpu/drm/ast/ast_main.c @@ -418,15 +418,15 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
ast_detect_chip(dev, &need_post);
- if (need_post) - ast_post_gpu(dev); - ret = ast_get_dram_info(dev); if (ret) goto out_free; drm_info(dev, "dram MCLK=%u Mhz type=%d bus_width=%d\n", ast->mclk, ast->dram_type, ast->dram_bus_width);
+ if (need_post) + ast_post_gpu(dev); + ret = ast_mm_init(ast); if (ret) goto out_free;