sunxi: drop 6.1 support

[openwrt/staging/nbd.git] / target / linux / sunxi / patches-6.1 / 009-v6.9-soc-sunxi-sram-export-register-0-for-THS-on-H616.patch

diff --git a/target/linux/sunxi/patches-6.1/009-v6.9-soc-sunxi-sram-export-register-0-for-THS-on-H616.patch b/target/linux/sunxi/patches-6.1/009-v6.9-soc-sunxi-sram-export-register-0-for-THS-on-H616.patch
deleted file mode 100644 (file)
index 3453e2a..0000000
--- a/target/linux/sunxi/patches-6.1/009-v6.9-soc-sunxi-sram-export-register-0-for-THS-on-H616.patch
+++ /dev/null
@@ -1,98 +0,0 @@
-From 898d96c5464b69af44f6407c5de81ebc349d574b Mon Sep 17 00:00:00 2001
-From: Andre Przywara <andre.przywara@arm.com>
-Date: Mon, 19 Feb 2024 15:36:33 +0000
-Subject: [PATCH] soc: sunxi: sram: export register 0 for THS on H616
-
-The Allwinner H616 SoC contains a mysterious bit at register offset 0x0
-in the SRAM control block. If bit 16 is set (the reset value), the
-temperature readings of the THS are way off, leading to reports about
-200C, at normal ambient temperatures. Clearing this bits brings the
-reported values down to the expected values.
-The BSP code clears this bit in firmware (U-Boot), and has an explicit
-comment about this, but offers no real explanation.
-
-Experiments in U-Boot show that register 0x0 has no effect on the SRAM C
-visibility: all tested bit settings still allow full read and write
-access by the CPU to the whole of SRAM C. Only bit 24 of the register at
-offset 0x4 makes all of SRAM C inaccessible by the CPU. So modelling
-the THS switch functionality as an SRAM region would not reflect reality.
-
-Since we should not rely on firmware settings, allow other code (the THS
-driver) to access this register, by exporting it through the already
-existing regmap. This mimics what we already do for the LDO control and
-the EMAC register.
-
-To avoid concurrent accesses to the same register at the same time, by
-the SRAM switch code and the regmap code, use the same lock to protect
-the access. The regmap subsystem allows to use an existing lock, so we
-just need to hook in there.
-
-Signed-off-by: Andre Przywara <andre.przywara@arm.com>
-Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
-Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
-Link: https://lore.kernel.org/r/20240219153639.179814-2-andre.przywara@arm.com
----
- drivers/soc/sunxi/sunxi_sram.c | 22 ++++++++++++++++++++++
- 1 file changed, 22 insertions(+)
-
---- a/drivers/soc/sunxi/sunxi_sram.c
-+++ b/drivers/soc/sunxi/sunxi_sram.c
-@@ -284,6 +284,7 @@ EXPORT_SYMBOL(sunxi_sram_release);
- struct sunxi_sramc_variant {
-       int num_emac_clocks;
-       bool has_ldo_ctrl;
-+      bool has_ths_offset;
- };
- 
- static const struct sunxi_sramc_variant sun4i_a10_sramc_variant = {
-@@ -305,8 +306,10 @@ static const struct sunxi_sramc_variant
- 
- static const struct sunxi_sramc_variant sun50i_h616_sramc_variant = {
-       .num_emac_clocks = 2,
-+      .has_ths_offset = true,
- };
- 
-+#define SUNXI_SRAM_THS_OFFSET_REG     0x0
- #define SUNXI_SRAM_EMAC_CLOCK_REG     0x30
- #define SUNXI_SYS_LDO_CTRL_REG                0x150
- 
-@@ -315,6 +318,8 @@ static bool sunxi_sram_regmap_accessible
- {
-       const struct sunxi_sramc_variant *variant = dev_get_drvdata(dev);
- 
-+      if (reg == SUNXI_SRAM_THS_OFFSET_REG && variant->has_ths_offset)
-+              return true;
-       if (reg >= SUNXI_SRAM_EMAC_CLOCK_REG &&
-           reg <  SUNXI_SRAM_EMAC_CLOCK_REG + variant->num_emac_clocks * 4)
-               return true;
-@@ -324,6 +329,20 @@ static bool sunxi_sram_regmap_accessible
-       return false;
- }
- 
-+static void sunxi_sram_lock(void *_lock)
-+{
-+      spinlock_t *lock = _lock;
-+
-+      spin_lock(lock);
-+}
-+
-+static void sunxi_sram_unlock(void *_lock)
-+{
-+      spinlock_t *lock = _lock;
-+
-+      spin_unlock(lock);
-+}
-+
- static struct regmap_config sunxi_sram_regmap_config = {
-       .reg_bits       = 32,
-       .val_bits       = 32,
-@@ -333,6 +352,9 @@ static struct regmap_config sunxi_sram_r
-       /* other devices have no business accessing other registers */
-       .readable_reg   = sunxi_sram_regmap_accessible_reg,
-       .writeable_reg  = sunxi_sram_regmap_accessible_reg,
-+      .lock           = sunxi_sram_lock,
-+      .unlock         = sunxi_sram_unlock,
-+      .lock_arg       = &sram_lock,
- };
- 
- static int __init sunxi_sram_probe(struct platform_device *pdev)