[PATCH 3/5] ath79: fix ar934x spi driver delays

[Oskari Lemmela]

Backport spi driver delay fixes from the 5.17-rc1 kernel.

Signed-off-by: Oskari Lemmela <oskari at lemmela.net>
---
 ...-ar934x-fix-transfer-and-word-delays.patch | 32 +++++++++
 ...3-v5.17-spi-ar934x-fix-transfer-size.patch | 67 +++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 target/linux/ath79/patches-5.10/402-v5.17-spi-ar934x-fix-transfer-and-word-delays.patch
 create mode 100644 target/linux/ath79/patches-5.10/403-v5.17-spi-ar934x-fix-transfer-size.patch

diff --git a/target/linux/ath79/patches-5.10/402-v5.17-spi-ar934x-fix-transfer-and-word-delays.patch b/target/linux/ath79/patches-5.10/402-v5.17-spi-ar934x-fix-transfer-and-word-delays.patch
new file mode 100644
index 0000000000..16aad7734a
--- /dev/null
+++ b/target/linux/ath79/patches-5.10/402-v5.17-spi-ar934x-fix-transfer-and-word-delays.patch
@@ -0,0 +1,32 @@
+From c70282457c380db7deb57c81a6894debc8f88efa Mon Sep 17 00:00:00 2001
+From: Oskari Lemmela <oskari at lemmela.net>
+Date: Wed, 22 Dec 2021 07:59:58 +0200
+Subject: [PATCH] spi: ar934x: fix transfer and word delays
+
+Add missing delay between transferred messages and words.
+
+Signed-off-by: Oskari Lemmela <oskari at lemmela.net>
+Link: https://lore.kernel.org/r/20211222055958.1383233-3-oskari@lemmela.net
+Signed-off-by: Mark Brown <broonie at kernel.org>
+---
+ drivers/spi/spi-ar934x.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/drivers/spi/spi-ar934x.c b/drivers/spi/spi-ar934x.c
+index def32e0aaefe..e1b64e35900c 100644
+--- a/drivers/spi/spi-ar934x.c
++++ b/drivers/spi/spi-ar934x.c
+@@ -137,8 +137,10 @@ static int ar934x_spi_transfer_one_message(struct spi_controller *master,
+ 					reg >>= 8;
+ 				}
+ 			}
++			spi_delay_exec(&t->word_delay, t);
+ 		}
+ 		m->actual_length += t->len;
++		spi_transfer_delay_exec(t);
+ 	}
+ 
+ msg_done:
+-- 
+2.25.1
+
diff --git a/target/linux/ath79/patches-5.10/403-v5.17-spi-ar934x-fix-transfer-size.patch b/target/linux/ath79/patches-5.10/403-v5.17-spi-ar934x-fix-transfer-size.patch
new file mode 100644
index 0000000000..361194e8ee
--- /dev/null
+++ b/target/linux/ath79/patches-5.10/403-v5.17-spi-ar934x-fix-transfer-size.patch
@@ -0,0 +1,67 @@
+From ebe33e5a98dcf14a9630845f3f10c193584ac054 Mon Sep 17 00:00:00 2001
+From: Oskari Lemmela <oskari at lemmela.net>
+Date: Wed, 22 Dec 2021 07:59:57 +0200
+Subject: [PATCH] spi: ar934x: fix transfer size
+
+If bits_per_word is configured, transfer only word amount
+of data per iteration.
+
+Signed-off-by: Oskari Lemmela <oskari at lemmela.net>
+Link: https://lore.kernel.org/r/20211222055958.1383233-2-oskari@lemmela.net
+Signed-off-by: Mark Brown <broonie at kernel.org>
+---
+ drivers/spi/spi-ar934x.c | 16 +++++++++++-----
+ 1 file changed, 11 insertions(+), 5 deletions(-)
+
+diff --git a/drivers/spi/spi-ar934x.c b/drivers/spi/spi-ar934x.c
+index e1b64e35900c..ec7250c4c810 100644
+--- a/drivers/spi/spi-ar934x.c
++++ b/drivers/spi/spi-ar934x.c
+@@ -82,7 +82,7 @@ static int ar934x_spi_transfer_one_message(struct spi_controller *master,
+ 	struct spi_device *spi = m->spi;
+ 	unsigned long trx_done, trx_cur;
+ 	int stat = 0;
+-	u8 term = 0;
++	u8 bpw, term = 0;
+ 	int div, i;
+ 	u32 reg;
+ 	const u8 *tx_buf;
+@@ -90,6 +90,11 @@ static int ar934x_spi_transfer_one_message(struct spi_controller *master,
+ 
+ 	m->actual_length = 0;
+ 	list_for_each_entry(t, &m->transfers, transfer_list) {
++		if (t->bits_per_word >= 8 && t->bits_per_word < 32)
++			bpw = t->bits_per_word >> 3;
++		else
++			bpw = 4;
++
+ 		if (t->speed_hz)
+ 			div = ar934x_spi_clk_div(sp, t->speed_hz);
+ 		else
+@@ -105,10 +110,10 @@ static int ar934x_spi_transfer_one_message(struct spi_controller *master,
+ 		iowrite32(reg, sp->base + AR934X_SPI_REG_CTRL);
+ 		iowrite32(0, sp->base + AR934X_SPI_DATAOUT);
+ 
+-		for (trx_done = 0; trx_done < t->len; trx_done += 4) {
++		for (trx_done = 0; trx_done < t->len; trx_done += bpw) {
+ 			trx_cur = t->len - trx_done;
+-			if (trx_cur > 4)
+-				trx_cur = 4;
++			if (trx_cur > bpw)
++				trx_cur = bpw;
+ 			else if (list_is_last(&t->transfer_list, &m->transfers))
+ 				term = 1;
+ 
+@@ -193,7 +198,8 @@ static int ar934x_spi_probe(struct platform_device *pdev)
+ 	ctlr->mode_bits = SPI_LSB_FIRST;
+ 	ctlr->setup = ar934x_spi_setup;
+ 	ctlr->transfer_one_message = ar934x_spi_transfer_one_message;
+-	ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
++	ctlr->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(24) |
++				   SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
+ 	ctlr->dev.of_node = pdev->dev.of_node;
+ 	ctlr->num_chipselect = 3;
+ 
+-- 
+2.25.1
+
-- 
2.25.1