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drm/panfrost: Add new compatible for Mali on the MT8183 SoC

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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
This commit is contained in:
AngeloGioacchino Del Regno
2023-03-16 11:20:40 +01:00
committed by Boris Brezillon
parent 4c6811800c
commit ab1a072c05
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/panfrost/panfrost_drv.c
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@@ -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 },
{}
};