[PATCH 5.19 233/717] spi: meson-spicc: do not rely on busy flag in pow2 clk ops

Greg Kroah-Hartman
2022-10-22T07:57:00Z

From: Neil Armstrong <narmstrong@baylibre.com>

[ Upstream commit 36acf80fc0c4b5ebe6fa010b524d442ee7f08fd3 ]

Since [1], controller's busy flag isn't set anymore when the
__spi_transfer_message_noqueue() is used instead of the
__spi_pump_transfer_message() logic for spi_sync transfers.

Since the pow2 clock ops were limited to only be available when a
transfer is ongoing (between prepare_transfer_hardware and
unprepare_transfer_hardware callbacks), the only way to track this
down is to check for the controller cur_msg.

[1] ae7d2346dc89 ("spi: Don't use the message queue if possible in spi_sync")

Fixes: 09992025dacd ("spi: meson-spicc: add local pow2 clock ops to preserve rate between messages")
Fixes: ae7d2346dc89 ("spi: Don't use the message queue if possible in spi_sync")
Reported-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/r/20220908121803.919943-1-narmstrong@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/spi/spi-meson-spicc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-meson-spicc.c b/drivers/spi/spi-meson-spicc.c
index e4cb52e1fe26..6974a1c947aa 100644
--- a/drivers/spi/spi-meson-spicc.c
+++ b/drivers/spi/spi-meson-spicc.c
@@ -537,7 +537,7 @@ static unsigned long meson_spicc_pow2_recalc_rate(struct clk_hw *hw,
struct clk_divider *divider = to_clk_divider(hw);
struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider);

- if (!spicc->master->cur_msg || !spicc->master->busy)
+ if (!spicc->master->cur_msg)
return 0;

return clk_divider_ops.recalc_rate(hw, parent_rate);
@@ -549,7 +549,7 @@ static int meson_spicc_pow2_determine_rate(struct clk_hw *hw,
struct clk_divider *divider = to_clk_divider(hw);
struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider);

- if (!spicc->master->cur_msg || !spicc->master->busy)
+ if (!spicc->master->cur_msg)
return -EINVAL;

return clk_divider_ops.determine_rate(hw, req);
@@ -561,7 +561,7 @@ static int meson_spicc_pow2_set_rate(struct clk_hw *hw, unsigned long rate,
struct clk_divider *divider = to_clk_divider(hw);
struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider);

- if (!spicc->master->cur_msg || !spicc->master->busy)
+ if (!spicc->master->cur_msg)
return -EINVAL;

return clk_divider_ops.set_rate(hw, rate, parent_rate);
--
2.35.1