From: Guenter Roeck linux@roeck-us.net
This reverts commit d491a2c2cf96f9f3d855cf0bcd807d48ccb98e81 which is commit 9de2b9286a6dd16966959b3cb34fc2ddfd39213e upstream
With this patch in the tree, Chromebooks running the affected hardware no longer boot. Bisect points to this patch, and reverting it fixes the problem.
An analysis of the code with this patch applied shows:
ret = init_clks(pdev, clk); if (ret) return ERR_PTR(ret); ... for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++) { struct clk *c = clk[data->clk_id[j]];
if (IS_ERR(c)) { dev_err(&pdev->dev, "%s: clk unavailable\n", data->name); return ERR_CAST(c); }
scpd->clk[j] = c; }
Not all clocks in the clk_names array have to be present. Only the clocks in the data->clk_id array are actually needed. The code already checks if the required clocks are available and bails out if not. The assumption that all clocks have to be present is wrong, and commit 9de2b9286a6d needs to be reverted.
Fixes: 9de2b9286a6d ("ASoC: mediatek: Check for error clk pointer") Cc: Jiasheng Jiang jiasheng@iscas.ac.cn Cc: Mark Brown broonie@kernel.org Cc: James Liao jamesjj.liao@mediatek.com Cc: Kevin Hilman khilman@baylibre.com Cc: Matthias Brugger <matthias.bgg@gmail.com Cc: Frank Wunderlich frank-w@public-files.de Cc: Daniel Golle daniel@makrotopia.org Link: https://lore.kernel.org/lkml/20220205014755.699603-1-linux@roeck-us.net/ Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/soc/mediatek/mtk-scpsys.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-)
--- a/drivers/soc/mediatek/mtk-scpsys.c +++ b/drivers/soc/mediatek/mtk-scpsys.c @@ -411,17 +411,12 @@ out: return ret; }
-static int init_clks(struct platform_device *pdev, struct clk **clk) +static void init_clks(struct platform_device *pdev, struct clk **clk) { int i;
- for (i = CLK_NONE + 1; i < CLK_MAX; i++) { + for (i = CLK_NONE + 1; i < CLK_MAX; i++) clk[i] = devm_clk_get(&pdev->dev, clk_names[i]); - if (IS_ERR(clk[i])) - return PTR_ERR(clk[i]); - } - - return 0; }
static struct scp *init_scp(struct platform_device *pdev, @@ -431,7 +426,7 @@ static struct scp *init_scp(struct platf { struct genpd_onecell_data *pd_data; struct resource *res; - int i, j, ret; + int i, j; struct scp *scp; struct clk *clk[CLK_MAX];
@@ -486,9 +481,7 @@ static struct scp *init_scp(struct platf
pd_data->num_domains = num;
- ret = init_clks(pdev, clk); - if (ret) - return ERR_PTR(ret); + init_clks(pdev, clk);
for (i = 0; i < num; i++) { struct scp_domain *scpd = &scp->domains[i];