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authorAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>2023-03-16 11:20:40 +0100
committerBoris Brezillon <boris.brezillon@collabora.com>2023-03-23 10:43:19 +0100
commitab1a072c05a8f4f2ce3292140b30ea0b64ad260c (patch)
tree83b5760f3363dbfbf6b75e2db2f90bb8ae31715f /drivers/gpu/drm/panfrost/panfrost_drv.c
parent4c6811800cb48b5a0329f6e4de11d26000671553 (diff)
drm/panfrost: Add new compatible for Mali on the MT8183 SoC
The "mediatek,mt8183-mali" compatible uses platform data that calls for getting (and managing) two regulators ("mali" and "sram") but devfreq does not support this usecase, resulting in DVFS not working. Since a lot of MediaTek SoCs need to set the voltages for the GPU SRAM regulator in a specific relation to the GPU VCORE regulator, a MediaTek SoC specific driver was introduced to automatically satisfy, through coupling, these constraints: this means that there is at all no need to manage both regulators in panfrost but to otherwise just manage the main "mali" (-> gpu vcore) regulator instead. Keeping in mind that we cannot break the ABI, the most sensible route (avoiding hacks and uselessly overcomplicated code) to get a MT8183 node with one power supply was to add a new "mediatek,mt8183b-mali" compatible, which effectively deprecates the former. Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Steven Price <steven.price@arm.com> Reviewed-by: Chen-Yu Tsai <wenst@chromium.org> Tested-by: Chen-Yu Tsai <wenst@chromium.org> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230316102041.210269-12-angelogioacchino.delregno@collabora.com
Diffstat (limited to 'drivers/gpu/drm/panfrost/panfrost_drv.c')
-rw-r--r--drivers/gpu/drm/panfrost/panfrost_drv.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 45c4accb6a1e..4f39b410302c 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -647,6 +647,14 @@ static const struct panfrost_compatible amlogic_data = {
.vendor_quirk = panfrost_gpu_amlogic_quirk,
};
+/*
+ * The old data with two power supplies for MT8183 is here only to
+ * keep retro-compatibility with older devicetrees, as DVFS will
+ * not work with this one.
+ *
+ * On new devicetrees please use the _b variant with a single and
+ * coupled regulators instead.
+ */
static const char * const mediatek_mt8183_supplies[] = { "mali", "sram", NULL };
static const char * const mediatek_mt8183_pm_domains[] = { "core0", "core1", "core2" };
static const struct panfrost_compatible mediatek_mt8183_data = {
@@ -656,6 +664,14 @@ static const struct panfrost_compatible mediatek_mt8183_data = {
.pm_domain_names = mediatek_mt8183_pm_domains,
};
+static const char * const mediatek_mt8183_b_supplies[] = { "mali", NULL };
+static const struct panfrost_compatible mediatek_mt8183_b_data = {
+ .num_supplies = ARRAY_SIZE(mediatek_mt8183_b_supplies) - 1,
+ .supply_names = mediatek_mt8183_b_supplies,
+ .num_pm_domains = ARRAY_SIZE(mediatek_mt8183_pm_domains),
+ .pm_domain_names = mediatek_mt8183_pm_domains,
+};
+
static const char * const mediatek_mt8192_supplies[] = { "mali", NULL };
static const char * const mediatek_mt8192_pm_domains[] = { "core0", "core1", "core2",
"core3", "core4" };
@@ -684,6 +700,7 @@ static const struct of_device_id dt_match[] = {
{ .compatible = "arm,mali-bifrost", .data = &default_data, },
{ .compatible = "arm,mali-valhall-jm", .data = &default_data, },
{ .compatible = "mediatek,mt8183-mali", .data = &mediatek_mt8183_data },
+ { .compatible = "mediatek,mt8183b-mali", .data = &mediatek_mt8183_b_data },
{ .compatible = "mediatek,mt8192-mali", .data = &mediatek_mt8192_data },
{}
};