diff options
| author | Shuijing Li <shuijing.li@mediatek.com> | 2023-05-31 11:10:01 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-19 16:21:59 +0200 |
| commit | 07e81c9208d9a3d51402ed981427d805c324a2a6 (patch) | |
| tree | 5fb49a35f0fca8c6ca9b8df017804771ca210cc7 | |
| parent | 75439e6cd2a355070dd68808243fca384b7efef0 (diff) | |
| download | linux-07e81c9208d9a3d51402ed981427d805c324a2a6.tar.gz | |
pwm: mtk_disp: Fix the disable flow of disp_pwm
[ Upstream commit bc13d60e4e1e945b34769a4a4c2b172e8552abe5 ]
There is a flow error in the original mtk_disp_pwm_apply() function.
If this function is called when the clock is disabled, there will be a
chance to operate the disp_pwm register, resulting in disp_pwm exception.
Fix this accordingly.
Fixes: 888a623db5d0 ("pwm: mtk-disp: Implement atomic API .apply()")
Signed-off-by: Shuijing Li <shuijing.li@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Tested-by: Fei Shao <fshao@chromium.org>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/pwm/pwm-mtk-disp.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c index 3811578fcff0..db286284f3ee 100644 --- a/drivers/pwm/pwm-mtk-disp.c +++ b/drivers/pwm/pwm-mtk-disp.c @@ -79,14 +79,11 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, if (state->polarity != PWM_POLARITY_NORMAL) return -EINVAL; - if (!state->enabled) { - mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask, - 0x0); - - if (mdp->enabled) { - clk_disable_unprepare(mdp->clk_mm); - clk_disable_unprepare(mdp->clk_main); - } + if (!state->enabled && mdp->enabled) { + mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, + mdp->data->enable_mask, 0x0); + clk_disable_unprepare(mdp->clk_mm); + clk_disable_unprepare(mdp->clk_main); mdp->enabled = false; return 0; |