41 lines
1.2 KiB
Diff
41 lines
1.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jernej Skrabec <jernej.skrabec@siol.net>
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Date: Sun, 19 Jul 2020 11:37:41 +0200
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Subject: [PATCH] drm/sun4i: mixer: Add caching support
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Most registers are not safe to read out so enable cache in regmap.
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Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
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---
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drivers/gpu/drm/sun4i/sun8i_mixer.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
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index 3f2e56bc817d..ba239b20a639 100644
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--- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
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+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
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@@ -346,11 +346,23 @@ static const struct sunxi_engine_ops sun8i_engine_ops = {
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.layers_init = sun8i_layers_init,
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};
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+static bool sun8i_mixer_volatile_reg(struct device *dev, unsigned int reg)
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+{
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+ switch (reg) {
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+ case SUN8I_MIXER_GLOBAL_STATUS:
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+ case SUN8I_MIXER_GLOBAL_DBUFF:
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+ return true;
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+ }
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+ return false;
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+}
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+
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static const struct regmap_config sun8i_mixer_regmap_config = {
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+ .cache_type = REGCACHE_FLAT,
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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.max_register = 0xffffc, /* guessed */
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+ .volatile_reg = sun8i_mixer_volatile_reg,
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};
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static int sun8i_mixer_of_get_id(struct device_node *node)
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